The Elektor MultiCalculator Kit is an Arduino-based multifunction calculator that goes beyond basic calculations. It offers 22 functions including light and temperature measurement, differential temperature analysis, and NEC IR remote control decoding. The Elektor MultiCalculator is a handy tool for use in your projects or for educational purposes. The kit features a Pro Mini module as the computing unit. The PCB is easy to assemble using through-hole components. The enclosure consists of 11 acrylic panels and mounting materials for easy assembly. Additionally, the device is equipped with a 16x2 alphanumeric LCD, 20 buttons, and temperature sensors. The Elektor MultiCalculator is programmable with the Arduino IDE through a 6-way PCB header. The available software is bilingual (English and Dutch). The calculator can be programmed with a programming adapter, and it is powered through USB-C. Modes of Operation Calculator 4-Ring Resistor Code 5-Ring Resistor Code Decimal to Hexadecimal and Character (ASCII) conversion Hexadecimal to Decimal and Character (ASCII) conversion Decimal to Binary and Character (ASCII) conversion Binary to Decimal and Hexadecimal conversion Hz, nF, capacitive reactance (XC) calculation Hz, µH, inductive reactance (XL) calculation Resistance calculation of two resistors connected in parallel Resistance calculation of two resistors connected in series Calculation of unknown parallel resistor Temperature measurement Differential temperature measurement T1&T2 and Delta (δ) Light measurement Stopwatch with lap time function Item counter NEC IR remote control decoding AWG conversion (American Wire Gauge) Rolling Dice Personalize startup message Temperature calibration Specifications Menu languages: English, Dutch Dimensions: 92 x 138 x 40 mm Build time: approx. 5 hours Included PCB and though-hole components Precut acrylic sheets with all mechanical parts Pro Mini microcontroller module (ATmega328/5 V/16 MHz) Programming adapter Waterproof temperature sensors USB-C cable Downloads Software

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This DIY kit (HU-017A) is a wireless FM radio receiver with a 4-digit 7-segment display. It operates within the global FM receiving frequency band of 87.0-108.0 MHz, making it suitable for use in any country or region. The kit offers two power supply modes, allowing you to use it both at home and outdoors. This DIY electronic product will help you understand circuits and improve your soldering skills. Features 87.0-108.0 MHz FM Radio: Built-in RDA5807 FM data processor with a standard FM receiving frequency band. The FM frequency can be adjusted using the F+ and F- buttons. Adjustable Volume: Two volume adjustment methods – button and potentiometer. There are 15 volume levels. Active & Passive Audio Output: The kit has a built-in 0.5 W power amplifier to drive 8 Ω speakers directly. It also outputs audio signals to headsets or loudspeakers with AUX interfaces, allowing personal listening and sharing of FM audio. Configured with a 25 cm dedicated FM antenna and a (red) 4-digit 7-segment display for real-time display of FM radio frequency. The transparent acrylic shell protects the internal circuit board. It supports dual power supply methods – 5 V USB and 2x 1.5 V (AA) batteries. DIY Hand Soldering: The kit comes with various components that need to be installed manually. It helps exercise and improve soldering skills, making it suitable for electronics hobbyists, beginners, and educational purposes. Specifications Operating voltage DC 3 V/5 V Output impedance 8 Ω Output power 0.5 W Output channel Mono Receiver frequency 87.0 MHz~108.0 MHz Frequency accuracy 0.1 MHz Operating temperature −40°C to +85°C Operating humidity 5% to 95% RH Dimensions 107 x 70 x 23 mm IMPORTANT: Remove the batteries when powering the radio over to USB. Included 1x PCB 1x RDA5807M FM Receiver 1x STC15W404AS MCU 1x IC Socket 1x 74HC595D Register 1x TDA2822M Amplifier 1x IC Socket 1x AMS1117-3.3 V Voltage Converter 18x Metal Film Resistor 1x Potentiometer 4x Ceramic Capacitor 5x Electrolytic Capacitor 4x S8550 Transistor 1x Red LED 1x 4-digit 7-segment Display 1x Toggle Switch 1x SMD Micro USB Socket 1x Radio Antenna 1x AUX Audio Socket 4x Black Button 4x Button Cap 1x 0.5 W/8 Ω Speaker 1x Red/Black Wire 2x Double-sided adhesive 1x AA Battery Box 1x USB cable 6x Acrylic Board 4x Nylon Column Screw 4x M3 Screw 4x M3 Nut 4x M2x22 mm Screw 1x M2x6 mm Screw 5x M2 Nut

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Raspberry Pi-based Eye Catcher A standard sand clock just shows how time passes. In contrast, this Raspberry Pi Pico-controlled sand clock shows the exact time by “engraving” the four digits for hour and minute into the layer of sand. After an adjustable time the sand is flattened out by two vibration motors and everything begins all over again. At the heart of the sand clock are two servo motors driving a writing pen through a pantograph mechanism. A third servo motor lifts the pen up and down. The sand container is equipped with two vibration motors to flatten the sand. The electronic part of the sand clock consists of a Raspberry Pi Pico and an RTC/driver board with a real-time clock, plus driver circuits for the servo motors. A detailed construction manual is available for downloading. Features Dimensions: 135 x 110 x 80 mm Build time: approx. 1.5 to 2 hours Included 3x Precut acrylic sheets with all mechanical parts 3x Mini servo motors 2x Vibration motors 1x Raspberry Pi Pico 1x RTC/driver board with assembled parts Nuts, bolts, spacers, and wires for the assembly Fine-grained white sand

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Arduino-compatible, ESP32-controlled, 2-wheeled Balancing Robot The Elektor Mini-Wheelie is an experimental autonomous self-balancing robot platform. Based on an ESP32-S3 microcontroller, the self-balancing robot is fully programmable using the Arduino environment and open-source libraries. Its wireless capabilities allow it to be controlled remotely over Wi-Fi, Bluetooth or ESP-NOW or to communicate with a user or even another robot. An ultrasonic transducer is available for detecting obstacles. Its color display can be used for displaying cute facial expressions or, for the more down-to-earth users, cryptic debug messages. The robot comes as a neat kit of parts that you must assemble yourself. Everything is included, even a screwdriver. Note: The Mini-Wheelie is an educational development platform intended for learning, experimentation, and robotics development. It is not classified as a toy for children, and its features, documentation, and intended audience reflect this purpose. The product is aimed at students, educators, and developers who wish to explore robotics, programming, and hardware integration in an educational setting. Specifications ESP32-S3 microcontroller with Wi-Fi and Bluetooth MPU6050 6-axis Inertial Measurement Unit (IMU) Two independently controlled 12 V electric motors with tachometer Ultrasonic transducer 2.9" TFT color display (320 x 240) MicroSD card slot Battery power monitor 3S rechargeable Li-Po battery (11.1 V/2200 mAh) Battery charger included Arduino-based open-source software Dimensions (W x L x H): 23 x 8 x 13 cm Included 1x ESP32-S3 Mainboard + MPU6050 module 1x LCD board (2.9 inch) 1x Ultrasonic sensor 1x Battery pack (2200 mAh) 1x Battery charger 1x Motor tyre kit 1x Case board 1x Acrylic board 1x Screwdriver 1x Protective strip 1x Flex cable B (8 cm) 1x Flex cable A (12 cm) 1x Flex cable C 4x Copper column A (25 mm) 4x Copper column B (55 mm) 4x Copper column C (5 mm) 2x Plastic nylon column 8x Screws A (10 mm) 24x Screws B (M3x5) 8x Nuts 24x Metal washers 2x Zip tie 1x MicroSD card (32 GB) Downloads Documentation

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The Elektor Audio DSP FX Processor combines an ESP32 microcontroller and an ADAU1701 Audio DSP from Analog Devices. Besides a user-programmable DSP core, the ADAU1701 has high-quality analog-to-digital and digital-to-analog converters built-in and features an I²S port. This makes it suitable as a high-quality audio interface for the ESP32. Programs for the ESP32 can be created with Arduino, Platform IO, CMake or by using the Espressif IDF in another way. Programs for the ADAU7101 audio DSPs are created with the free visual programming tool SigmaStudio by dragging and dropping pre-defined algorithm blocks on a canvas. Applications Bluetooth/Wi-Fi audio sink (e.g. loudspeaker) & source Guitar effect pedal (stomp box) Music synthesizer Sound/function generator Programmable cross-over filter for loudspeakers Advanced audio effects processor (reverb, chorus, pitch shifting, etc.) Internet-connected audio device DSP experimentation platform Wireless MIDI MIDI to CV converter and many more... Specifications ADAU1701 28-/56-bit, 50-MIPS digital audio processor supporting sampling rates of up to 192 kHz ESP32 32-bit dual-core microcontroller with Wi-Fi 802.11b/g/n and Bluetooth 4.2 BR/EDR and BLE 2x 24-bit audio inputs (2 V RMS, 20 kΩ) 4x 24-bit audio outputs (0.9 V RMS, 600 Ω) 4x Control potentiometer MIDI in- and output I²C expansion port Multi-mode operation Power supply: 5 V DC USB or 7.5-12 V DC (barrel jack, center pin is GND) Current consumption (average): 200 mA Included 1x ESP32 Audio DSP FX Processor board (assembled) 1x ESP32-PICO-KIT 2x Jumpers 2x 18-pin headers (female) 4x 10 KB potentiometers Downloads Documentation GitHub

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Build Your Own Vintage Radio Broadcaster The Elektor AM Transmitter Kit allows streaming audio to vintage AM radio receivers. Based on a Raspberry Pi Pico microcontroller module, the AM Transmitter can transmit on 32 frequencies in the AM band, from 500 kHz up to 1.6 MHz in 32 steps of approx. 35 kHz. The frequency is selected with a potentiometer and shown on a 0.96" OLED display. A pushbutton allows toggles the transmitting mode between On and Off. The range of the transmitter depends on the antenna. The onboard antenna provides a range of a few centimeters, requiring the AM Transmitter to be placed close to or inside the radio. An external loop antenna (not included) can be connected to increase the range. The Elektor AM Transmitter Kit comes as a kit of parts that you must solder to the board yourself. Features The board is compatible with a Hammond 1593N enclosure (not included).A 5 VDC power supply with micro-USB connector (e.g., an old phone charger) is needed to power the kit (not included). Current consumption is 100 mA. The Arduino software (requiring Earle Philhower’s RP2040 Boards Package) for the Elektor AM Transmitter Kit plus more information is available at the Elektor Labs page of this project. Component List Resistors R1, R4 = 100 Ω R2, R3, R8 = 10 kΩ R5, R6, R9, R10, R11 = 1 kΩ R7 = optional (not included) P1 = potentiometer 100 kΩ, linear Capacitors C1 = 22 µF 16V C2, C4 = 10 nF C3 = 150 pF Miscellaneous K1 = 4×1 pin socket K2, K3 = 3.5 mm socket Raspberry Pi Pico pushbutton, angle mount 0.96" monochrome I²C OLED display PCB 150292-1

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The Elektor ESP32 Energy Meter is a device designed for real-time energy monitoring and smart home integration. Powered by the ESP32-S3 microcontroller, it offers robust performance with modular and scalable features. The device uses a 220 V-to-12 V step-down transformer for voltage sampling, ensuring galvanic isolation and safety. Its compact PCB layout includes screw-type terminal blocks for secure connections, a Qwiic connector for additional sensors, and a programming header for direct ESP32-S3 configuration. The energy meter is compatible with single-phase and three-phase systems, making it adaptable for various applications. The energy meter is simple to set up and integrates with Home Assistant, offering real-time monitoring, historical analytics, and automation capabilities. It provides accurate measurements of voltage, current, and power, making it a valuable tool for energy management in homes and businesses. Features Comprehensive Energy Monitoring: Get detailed insights into your energy usage for smarter management and cost savings. Customizable Software: Tailor functionality to your needs by programming and integrating custom sensors. Smart Home Ready: Compatible with ESPHome, Home Assistant, and MQTT for full Smart Home integration. Safe & Flexible Design: Operates with a 220 V-to-12 V step-down transformer and features a pre-assembled SMD board. Quick Start: Includes one Current Transformer (CT) sensor and access to free setup resources. Specifications Microcontroller ESP32-S3-WROOM-1-N8R2 Energy Metering IC ATM90E32AS Status Indicators 4x LEDs for power consumption indication2x Programmable LEDs for custom status notifications User Input 2x Push buttons for user control Display Output I²C OLED display for real-time power consumption visualization Input Voltage 110/220 V AC (via step-down transformer) Input Power 12 V (via step-down transformer or DC input) Clamp Current Sensor YHDC SCT013-000 (100 A/50 mA) included Smart Home Integration ESPHome, Home Assistant, and MQTT for seamless connectivity Connectivity Header for programming, Qwiic for sensor expansion Applications Supports single-phase and three-phase energy monitoring systems Dimensions 79.5 x 79.5 mm Included 1x Partly assembled board (SMDs are pre-mounted) 2x Screw terminal block connerctors (not mounted) 1x YHDC SCT013-000 current transformer Required Power transformer not included Downloads Datasheet (ESP32-S3-WROOM-1) Datasheet (ATM90E32AS) Datasheet (SCT013-000) Frequently Asked Questions (FAQ) From Prototype to Finished Product What started as an innovative project to create a reliable and user-friendly energy meter using the ESP32-S3 microcontroller has evolved into a robust product. Initially developed as an open-source project, the ESP32 Energy Meter aimed to provide precise energy monitoring, smart home integration and more. Through meticulous hardware and firmware development, the energy meter now stands as a compact, versatile solution for energy management.

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The ICL8038 signal generator delivers versatile waveforms, including sine, triangle, square, and forward/reverse sawtooth, making it suitable for a wide range of applications. Powered by the ICL8038 chip and high-speed operational amplifiers, it ensures exceptional precision and signal stability. With a frequency range of 5 Hz to 400 kHz, it supports applications from audio to radio frequencies. Its adjustable duty cycle, ranging from 2% to 95%, allows for precise waveform customization to meet various needs. The DIY kit is beginner-friendly, featuring through-hole components for easy assembly. It includes all necessary parts, an acrylic shell, and a detailed manual, providing everything required to build and use the signal generator efficiently. Specifications Frequency range 5 Hz~400 KHz (adjustable) Power supply voltage 12 V~15 V Duty cycle range 2~95% (adjustable) Low distortion sine wave 1% Low temperature drift 50 ppm/°C Output triangular wave linearity 0.1% DC bias range −7.5 V~7.5 V Output amplitude range 0.1 V~11 VPP (working voltage 12 V) Dimensions 89 x 60 x 35 mm Weight 81 g Included PCB incl. all necessary components Acrylic shell Manual

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The DIY Mini Digital Oscilloscope Kit (with shell) is an easy-to-build kit for a tiny digital oscilloscope. Besides the power switch, it has only one other control, a rotary encoder with a built-in pushbutton. The kit's microcontroller comes preprogrammed. The 0.96" OLED display has a resolution of 128 x 64 pixels. The oscilloscope features one channel that can measure signals up to 100 kHz. The maximum input voltage is 30 V, the minimum voltage is 0 V. The kit consists of through-hole components (THT) are surface-mount devices (SMD). Therefore, assembling the kit means soldering SMD parts, which requires some soldering experience. Specifications Vertical range: 0 to 30 V Horizontal range: 100 µs to 500 ms Trigger type: auto, normal and single Trigger edge: rising and falling Trigger level: 0 to 30 V Run/Stop mode Automatic frequency measurement Power: 5 V micro-USB 10 Hz, 5 V sinewave output 9 kHz, 0 to 4.8 V square wave output Display: 0.96-inch OLED screen Dimensions: 57 x 38 x 26 mm Downloads Documentation

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Whistle And It Chirps Back At You! Although birds of all sorts are lovingly owned and watched by many people, sadly most of them have not yet learnt to communicate with us. This all-electronic bird takes a step in the right direction: when you whistle at it, it chirps back! Features Responds to Whistling Adjustable Bird Sounds (Tone and Length) Elektor Heritage Circuit Symbols Tried & Tested by Elektor Labs Educational & Geeky Project Through-Hole Parts Only Included Printed Circuit Board All Components Wooden Stand Bill of Materials Resistors R1,R2 = 2.2kΩ R3,R4,R13 = 47kΩ R5 = 4.7kΩ R6 = 3.3kΩ R7,R10,R11,R12,R17 = 100kΩ R8,R19,R23 = 1kΩ R9 = 1MΩ R14,R15 = 10kΩ R16,R18 = 470kΩ R20 = 68kΩ R21 = 10MΩ R22 = 2.7kΩ R24 = 22Ω P1,P2 = 1MΩ P3,P5 = 470kΩ P4 = 100kΩ Capacitors C1,C2,C12 = 100nF C3,C4 = 10nF C5 = 22μF, 16V C6,C7,C11 = 10μF, 16V C8 = 2.2μF, 100V C9 = 1μF, 50V C10 = 2.2nF C13 = 10nF Semiconductors D1,D3,D4,D5,D6,D7,D8 = 1N4148 D2 = 3V3 Zener diode T1,T2 = BC557B T3 = BC547B T4 = BC327-40 IC1 = TL084CN IC2 = 4093 Miscellaneous BT1 = wired battery clip for 6LR61/PP3 LS1 = miniature loudspeaker, 8Ω, 0.5W S1 = switch, slide, SPDT MIC1 = electret microphone PCB 230153-1 v1.1

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The TV-B-Gone universal remote control allows you to turn virtually any TV On or OFF. You control when you see TV, rather than what you see. The TV-B-Gone Keychain remote is so small that it easily fits in your pocket so that you have it handy whenever you need it, wherever you go: bars, restaurants, laundromats, ballparks, arenas, etc. The TV-B-Gone Kit is a great way to teach about electronics. When soldered together, it allows you to turn off almost any television within 150 feet or more. It works on over 230 total power codes – 115 American/Asian and another 115 European codes. You can select which zone you want during kit assembly. This is an unassembled kit which means that soldering and assembly is required – but it’s very easy and a great introduction to soldering in general. This kit makes the popular TV-B-Gone remote more fun because you created it yourself with some basic soldering and assembly! Show your friends and family how technologically savvy you are, and entertain them with the power of the TV-B-Gone! The kit is powered by 2x AA batteries and the output comes from 2x narrow beam IR LEDs and 2x wide-beam IR LEDs. Included All required parts/components Required Tools, soldering iron, and batteries Downloads GitHub

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The Elektor Milliohmmeter Adapter uses the precision of a multimeter to measure very low resistance values. It is an adapter that converts a resistance into a voltage that can be measured with a standard multimeter. The Elektor Milliohmmeter Adapter can measure resistances below 1 mΩ using a 4-wire (Kelvin) method. It is useful for locating short circuits on printed circuit boards (PCB). The adapter features three measurement ranges – 1 mΩ, 10 mΩ, and 100 mΩ – selectable via a slide switch. It also includes onboard calibration resistors. The Elektor Milliohmmeter Adapter is powered by three 1.5 V AA batteries (not included). Specifications Measurement ranges 1 mΩ, 10 mΩ, 100 mΩ, 0.1% Power supply 3x 1.5 V AA batteries (not included) Dimensions 103 x 66 x 18 mm (compatible with Hammond 1593N-type enclosure, not included) Special feature On-board calibration resistors Downloads Documentation

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Pull Down Lever For Highest Score! This Elektor Circuit Classic from 1984 shows a playful application of CMOS 400x series logic ICs in combination with LEDs, a highly popular combination at the time. The project imitates a spinning-digit type slot machine. The Game To play the game, first agree on the number of rounds. Player 1 actuates the switch lever as long as desired and releases it. The LEDs then show the score which is the sum of the 50-20-10-5 digits lit up. If the Play Again! LED lights, Player 1 has another, “free” round. If not, it’s Player 2’s turn. The players keep tab of their scores, and the highest score wins. Features LEDs Indicate Score Multi-Player and Play Again! Elektor Heritage Circuit Symbols Tried & Tested by Elektor Labs Educational & Geeky Project Through-Hole Parts Only Included Printed Circuit Board All Components Wooden Stand Bill of Materials Resistors (5%, 250 mW) R1,R2,R3,R4 = 100kΩ R5,R6,R7,R8,R9,R10 = 1kΩ Capacitors C1 = 4.7nF, 10%, 50V, 5mm C2 = 4.7μF, 10%, 63V, axial C3,C4 = 100nF, 10 %, 50V, ceramic X7R, 5mm Semiconductors LED1-LED6 = red, 5mm (T1 3/4) IC1 = 74HC4024 IC2 = 74HC132 Miscellaneous S1 = switch, toggle, 21mm lever, SPDT, momentary S2 = switch, tactile, 24V, 50mA, 6x6mm S3 = switch, slide, SPDT IC1,IC2 = IC socket, DIP14 BT1 = PCB-mount CR2032 battery retainer clip Desktop Stand PCB 230098-1 Not included: BT1 = CR2032 coin cell battery

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A Retro Roll with a Neon Soul LED-based dice are common, but their light is cold. Not so for this electronic neon dice, which displays its value with the warm glow of neon lamps. It is perfect for playing games on cold, dark winter evenings. The pips of the dice are neon lamps and the random number generator has six neon lamps to show that it is working. Even though the dice has an on-board 100-V power supply, it is completely safe. As with all Elektor Classic products, the dice too has its circuit diagram printed on the front while an explanation of how the circuit works can be found on the rear side. The Neon Lamp Dice comes as a kit of easy-to-solder through-hole parts. The power supply is a 9-V battery (not included). Features Warm Vintage Glow Elektor Heritage Circuit Symbols Tried & Tested by Elektor Labs Educational & Geeky Project Through-Hole Parts Only Included Printed Circuit Board All Components Wooden Stand Required 9 V battery Component List Resistors (THT, 150 V, 0.25 W) R1, R2, R3, R4, R5, R6, R14 = 1 MΩ R7, R8, R9, R10, R11, R12 = 18 kΩ R13, R15, R16, R17, R18, R21, R23, R24, R25, R26, R28, R30, R33 = 100 kΩ R32, R34 = 1.2 kΩ R19, R20, R22, R27, R29 = 4.7 kΩ R31 = 1 Ω Capacitors C1, C2, C3, C4, C5, C6 = 470 nF, 50 V, 5 mm pitch C7, C9, C11, C12 = 1 µF, 16 V, 2 mm pitch C8 = 470 pF, 50 V, 5 mm pitch C10 = 1 µF, 250 V, 2.5 mm pitch Inductors L1 = 470 µH Semiconductors D1, D2, D3, D4, D5, D6, D7 = 1N4148 D8 = STPS1150 IC1 = NE555 IC2 = 74HC374 IC3 = MC34063 IC4 = 78L05 T1, T2, T3, T4, T5 = MPSA42 T6 = STQ2LN60K3-AP Miscellaneous K1 = PP3 9 V battery holder NE1, NE2, NE3, NE4, NE5, NE6, NE7, NE8, NE9, NE10, NE11, NE12, NE13 = neon light S2 = Miniature slide switch S1 = Pushbutton (12 x 12 mm)

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This bundle contains the popular Elektor Sand Clock for Raspberry Pi Pico and the new Elektor Laser Head Upgrade, offering even more options for displaying the time. Not only can you "engrave" the current time in sand, you can now alternatively write it on a glow-in-the-dark foil or create green drawings. Contents of the bundle Elektor Sand Clock for Raspberry Pi Pico (normal price: €50) NEW: Elektor Laser Head Upgrade for Sand Clock (normal price: €35) Elektor Sand Clock for Raspberry Pi (Raspberry Pi-based Eye Catcher) A standard sand clock just shows how time passes. In contrast, this Raspberry Pi Pico-controlled sand clock shows the exact time by "engraving" the four digits for hour and minute into the layer of sand. After an adjustable time the sand is flattened out by two vibration motors and everything begins all over again. At the heart of the sand clock are two servo motors driving a writing pen through a pantograph mechanism. A third servo motor lifts the pen up and down. The sand container is equipped with two vibration motors to flatten the sand. The electronic part of the sand clock consists of a Raspberry Pi Pico and an RTC/driver board with a real-time clock, plus driver circuits for the servo motors. A detailed construction manual is available for downloading. Features Dimensions: 135 x 110 x 80 mm Build time: approx. 1.5 to 2 hours Included 3x Precut acrylic sheets with all mechanical parts 3x Mini servo motors 2x Vibration motors 1x Raspberry Pi Pico 1x RTC/driver board with assembled parts Nuts, bolts, spacers, and wires for the assembly Fine-grained white sand Elektor Laser Head Upgrade for Sand Clock The new Elektor Laser Head transforms the Sand Clock into a clock that writes the time on glow-in-the-dark film instead of sand. In addition to displaying the time, it can also be used to create ephemeral drawings. The 5 mW laser pointer, with a wavelength of 405 nm, produces bright green drawings on the glow-in-the-dark film. For best results, use the kit in a dimly lit room. Warning: Never look directly into the laser beam! The kit includes all the necessary components, but soldering three wires is required. Note: This kit is also compatible with the original Arduino-based Sand Clock from 2017. For more details, see Elektor Magazine 1-2/2017 and Elektor Magazine 1-2/2018.

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The Elektor Laser Head transforms the Elektor Sand Clock into a clock that writes the time on glow-in-the-dark film instead of sand. In addition to displaying the time, it can also be used to create ephemeral drawings. The 5 mW laser pointer, with a wavelength of 405 nm, produces bright green drawings on the glow-in-the-dark film. For best results, use the kit in a dimly lit room. Warning: Never look directly into the laser beam! The kit includes all the necessary components, but soldering three wires is required. Note: This kit is also compatible with the original Arduino-based Sand Clock from 2017. For more details, see Elektor Magazine 1-2/2017 and Elektor Magazine 1-2/2018.

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If you are looking for a simple way to learn soldering, or just want to make a small gadget that you can carry, this set is a great opportunity. Reaction game is an educational kit which teaches you how to solder, and in the end, you get to have your own small game. The goal of the game is to press the button next to the LED as soon as it turns on. With every correct answer, the game gets a bit harder – the time you have to press the button shortens. How many correct answers can you get? It’s based on ATtiny404 microcontroller, programmed in Arduino. At its back, you’ll find CR2032 battery which makes the kit portable. There’s keychain holder as well. Soldering process is easy enough based on the mark on the PCB. Included 1x PCB 1x ATtiny404 microcontroller 4x LEDs 4x Pushbuttons 1x Switch 4x Resistors (330 ohm) 1x CR2032 battery holder 1x Battery CR2032 1x Keychain holder

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This kit contains more than 130 components and is specially compiled to build the projects from The Book of 555 Timer Projects. The components are through-hole, so they fit onto a breadboard. This makes it easy to modify and experiment with the projects. Kit Contents Resistors 1x 15 kΩ 1x 68 kΩ 2x 47 kΩ 1x 82 kΩ 2x 820 Ω 1x 8.2 kΩ 3x 10 kΩ 1x 1.8 kΩ 1x 6.8 kΩ 14x 2.2 kΩ 10x 680 Ω 1x 27 kΩ 1x 5.6 kΩ 1x 560 kΩ 1x 4.7 kΩ 1x 3.3 kΩ 3x 33 kΩ 1x 36 kΩ 2x 100 kΩ 5x 1 kΩ 1x 3.9 kΩ 2x 56 kΩ 2x 12 kΩ 1x 10 kΩ potentiometer 1x 1 MΩ potentiometer 2x 50 kΩ potentiometer 3x 20 kΩ potentiometer 1x 10 kΩ potentiometer 1x 10 kΩ potentiometer 1x 50 kΩ potentiometer 1x 100 kΩ potentiometer 1x 50 kΩ potentiometer Capacitors 1x 0.33 μF 1x 1 μF 1x 10 nF 1x 22 nF 1x 47 nF 1x 100 nF 1x 10 μF electrolytic 1x 33 μF electrolytic 2x 100 μF electrolytic LEDs 10x 5 mm red LED 10x 3 mm red LED 3x 3 mm yellow LED 3x 3 mm green LED 1x Common-cathode 7-segment LED Semiconductors 3x 555 timer 1x CD4017 counter 1x CD4026 counter 1x CD4011 NAND gate 4x 1N4148 diode 1x IRFZ46N MOSFET 1x Thermistor 1x Light dependent resistor (LDR) Miscellaneous 1x Passive buzzer 1x Active buzzer 1x SG90 servo 1x 8 Ω mini loudspeaker 1x 9 V DC brushed motor 1x 5 V relay 1x 9 V battery clip 7x Pushbutton switches 1x Breadboard 1x Breadboard jumper wires

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Learn the basics of electronics by assembling manually your Arduino Uno, become familiar with soldering by mounting every single component, and then unleash your creativity with the only kit that becomes a synth! The Arduino Make-Your-Uno kit is really the best way to learn how to solder. And when you are done, the packaging allows you to build a synth and make your music. A kit with all the components to build your very own Arduino Uno and audio synthesizer shield. The Make-Your-Uno kit comes with a complete set of instructions in a dedicated content platform. This includes video material, a 3D interactive viewer for following detailed instructions, and how to program your board once it is finished. This kit contains: Arduino Make-Your-Uno 1x Make-Your-Uno PCB 1x USB C Serial adapter Board 7x Resistors 1k Ohm 2x Resistors 10k Ohm 2x Resistors 1M Ohm 1x Diode (1N4007) 1x 16 MHz Crystal 4x Yellow LEDs 1x Green LED 1x Push-Button 1x MOSFET 1x LDO (3.3 V) 1x LDO (5 V) 3x Ceramic capacitors (22pF) 3x Electrolytic capacitors (47uF) 7x Polyester capacitors (100nF) 1x Socket for ATMega 328p 2x I/O Connectors 1x Connector header 6 pins 1x Barrel jack connector 1x ATmega 328p Microcontroller Arduino Audio Synth 1x Audio Synth PCB 1x Resistor 100k Ohm 1x Resistor 10 Ohm 1x Audio amplifier (LM386) 1x Ceramic capacitors (47nF) 1x Electrolytic capacitors (47uF) 1x Electrolytic capacitors (220uF) 1x Polyester capacitor (100nF) 4x connectors pin header 6x potentiometer 10k Ohm with plastic knobs Spare parts 2x Electrolytic capacitors (47uF) 2x Polyester capacitor (100nF) 2x Ceramic capacitors (22pF) 1x Push-Button 1x Yellow LEDs 1x Green LED Mechanical parts 5x Spacers 12 mm 11x Spacers 6 mm 5x screw nuts 2x screws 12 mm

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Multilingual RGB LED Kit (incl. Raspberry Pi Pico) Bring some engineering magic to your festive season with the Wordy Christmas Tree, a unique DIY electronics kit designed by Elektor. This beautifully engineered 3D Christmas tree combines eleven PCBs, a Raspberry Pi Pico, and 27 addressable RGB LEDs to illuminate Christmas greetings in seven languages: Danish, Dutch, English, French, German, Italian, and Spanish. Unlike ordinary LED trees, each word inside the tree has its own light chamber, creating a refined, softly glowing display without sound or flicker. The LEDs are fully WS2812-compatible and driven via the popular Adafruit NeoPixel library, making custom animations and color effects easy to create. Perfect for makers, tinkerers, and festive electronics fans, this kit offers both an enjoyable build and a striking, conversation-worthy decoration. The Wordy Christmas Tree is your perfect holiday maker project! Features Multilingual greetings (7 languages) milled into the front panel 3D construction from 11 interlocking PCBs Powered by Raspberry Pi Pico 27 individually addressable RGB LEDs (pre-mounted) Smooth fade-in and fade-out animations Fully programmable using the Arduino IDE A 5-V power supply (with micro-USB connector) capable of ≥1 A is recommended for maximum brightness (not included) Included All required PCBs with LEDs and other SMD parts mounted Raspberry Pi Pico (to be soldered & programmed by the user) 3-way pin header (to be soldered by the user) 3-way pin socket (to be soldered by the user) 4x Self-adhesive dome bumpers Project Page Elektor Labs

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The matte-black circuit board is extra thick and has subtle white markings, including an alphanumeric grid and PIN labels. The wiring pattern – that of classic breadboards – is easy to see by looking at the exposed traces on the bottom of the board. The kit comes complete with the 'Integrated Circuit Leg' stand and 8 colour-coded thumbscrew terminal posts. Using the terminal posts and solder points, you can hook up to your 'IC' with bare wires, lugs, alligator clips, and/or solder joints. Connections to the 8 terminal posts are through the three-position strips on the PCB; each is labelled with the corresponding PIN. Features Anodized aluminium stand 8-32 size press-fit threaded inserts (8 pieces) pre-installed in the protoboard All materials (including the circuit board and stand) are RoHS compliant (lead-free) Tri lobular thread forming screws (6 pieces, black, 6-32 thread size) and spacers for mounting the stand. Dimensions: 13.25 x 8.06 x 2.54 mm Dimensions assembled: 13.25 x 9.9 x 4.3 cm

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The Theremin was the first music synthesizer. The Junior Theremin is our, smaller, version of that classic electronic musical instrument. As you move your hand towards and away from the wire aerial, the Theremin responds by changing the pitch of the note it is playing. It can play individual notes as well as varying the tone of a single note. How do you use the theremin? The wire aerial responds to the movement of your hand towards and away from it and changes the pitch of the note it plays, without actually being touched. Junior Theremin works in two modes – continuous and discrete. When you first connect the battery Junior Theremin is in continuous mode. Pressing both pushbuttons together switches between continuous and discrete modes. Discrete mode, as its name implies, plays individual or discrete notes rather than a continuously variable tone. Eight notes over a single octave are available. In discrete mode the two pushbuttons change the octave of the notes. The left-hand pushbutton (marked -) lowers the octave, and the right-hand pushbutton (marked +) raises the octave. The pushbuttons only change the octave so long as they are pressed. In continuous mode the pushbuttons have no effect. Downloads Manual

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If you are looking for an easy way to get started with soldering or simply want to make a small portable gadget, this set is a great opportunity. "LED cube" is an educational set for learning the soldering skill, with which you get a small electronic game at the end. After you turn on and shake this board, certain leds will light up randomly and symbolize the number, as if a real die had been thrown. It is based on the Attiny404 microcontroller, programmed in Arduino, and there is a battery on the back which makes this gadget portable. There is also a keychain so you can always carry your new game with you! Soldering is easy according to the markings on the board. Included 1x PCB 1x ATtiny404 microcontroller 7x LEDs 7x Resistors (330 ohm) 1x Resistor (10 kohm) 1x Battery holder 1x CR2032 battery 1x Switch 1x Vibration sensor SW-18020P 1x Keychain ring

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4 LEDs and 4 push buttons ensure hours of fun. Repeat the combination, harder and harder, faster and faster. The microprocessor-controlled game has 4 different difficulty levels and low consumption. The sound and/or LED indication are adjustable. To save the three 1.5 V AA batteries (not included), the kit automatically switches itself off when not in use. Downloads Manual

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