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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 ESP32-PICO-Kit fits into a mini breadboard. It is fully functional with the minimum number of discrete components, while it has all the ESP32 pins exposed. Features Complete up-to-date documentation is available. All instructions and commands presented work as described. Plentiful additional information and hardware documentation are available too. Applications for the ESP32-PICO-KIT can be developed on Windows, Linux or Mac. Two cores and a radio Like the ESP8266 the ESP32 has Wi-Fi but adds Bluetooth. It also has two 32-bit cores inside, making it extremely powerful, and providing all the ports and interfaces that the ESP8266 is lacking.Oversimplifying things, one might say that the ESP8266 is a Wi-Fi controller that provides some I/O, whereas the ESP32 is a full-fledged controller that also has Wi-Fi. ESP32 peripherals The ESP32 exposes an ADC & DAC, touch sensor circuitry, an SD/SDIO/MMC host controller, an SDIO/SPI slave controller, an EMAC, PWM to control LEDs and motors, UART, SPI, I²C, I²S, infrared remote controller, and, of course, GPIO. ESP32-PICO-KIT Development board The ESP32-PICO-D4 is a System-on-Chip (SoC) integrating an ESP32 chip together with a 4 MB SPI flash memory in a tiny 7 x 7 mm package. The ESP32-PICO-KIT is a breakout board for this SoC with an onboard USB-to-serial converter for easy programming and debugging. Besides the board, you'll need a programming toolchain. Complete, up-to-date documentation from Espressif is available on the Read the Docs website. All instructions and commands presented work as described.Plentiful additional information and hardware documentation are available too. Applications for the ESP32-PICO-KIT can be developed on Windows, Linux or Mac.

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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 Super Servo Tester can control servos and measure servo signals. It can test up to four servo channels at the same time. The Super Servo Tester comes as a kit. All the parts required to assemble the Super Servo Tester are included in the kit. Assembling the kit requires basic soldering skills. The microcontroller is already programmed. The Super Servo Tester features two operating modes: Control/Manual and Measure/Inputs. In Control/Manual mode the Super Servo Tester generates control signals on its outputs for up to four servos or for the flight controller or ESC. The signals are controlled by the four potentiometers. In Measure/Inputs the Super Servo Tester measures the servo signals connected to its inputs. These signals may come from for instance an ESC, a flight controller, or the receiver or another device. The signals are also routed to the outputs to control the servos or the flight controller or ESC. The results are shown on the display. Specifications Operating modes Control/Manual & Measure/Inputs Channels 3 Servo signal inputs 4 Servo signal outputs 4 Alarm Buzzer & LED Display 0.96' OLED (128 x 32 pixels) Input voltage on K5 7-12 VDC Input voltage on K1 5-7.5 VDC Input current 30 mA (9 VDC on K5, nothing connected to K1 and K2) Dimensions 113 x 66 x 25 mm Weight 60 g Included Resistors (0.25 W) R1, R3 1 kΩ, 5% R2, R4, R5, R6, R7, R9, R10 10 kΩ, 5% R8 22 Ω, 5% P1, P2, P3, P4 10 kΩ, lin/B, vertical potentiometer Capacitors C1 100 µF 16 V C2 10 µF 25 V C3, C4, C7 100 nF C5, C6 22 pF Semiconductors D1 1N5817 D2 LM385Z-2.5 D3 BZX79-C5V1 IC1 7805 IC2 ATmega328P-PU, programmed LED1 LED, 3 mm, red T1 2N7000 Miscellaneous BUZ1 Piezo buzzer with oscillator K1, K2 2-row, 12-way pinheader, 90° K5 Barrel jack K4 1-row, 4-way pin socket K3 2-row, 6-way boxed pinheader S1 Slide switch DPDT S2 Slide switch SPDT X1 Crystal, 16 MHz 28-way DIP socket for IC2 Elektor PCB OLED display, 0.96', 128 x 32 pixels, 4-pin I²C interface Links Elektor Magazine Elektor Labs

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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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At the core of this module is ESP32-S2, an Xtensa® 32-bit LX7 CPU that operates at up to 240 MHz. The chip has a low-power co-processor that can be used instead of the CPU to save power while performing tasks that do not require much computing power, such as monitoring of peripherals. ESP32-S2 integrates a rich set of peripherals, ranging from SPI, I²S, UART, I²C, LED PWM, TWAITM, LCD, Camera interface, ADC, DAC, touch sensor, temperature sensor, as well as up to 43 GPIOs. It also includes a full-speed USB On-The-Go (OTG) interface to enable USB communication.FeaturesMCU ESP32-S2 embedded, Xtensa® single-core 32-bit LX7 microprocessor, up to 240 MHz 128 KB ROM 320 KB SRAM 16 KB SRAM in RTC Wi­Fi 802.11 b/g/n Bit rate: 802.11n up to 150 Mbps A-MPDU and A-MSDU aggregation 0.4 µs guard interval support Center frequency range of operating channel: 2412 ~ 2484 MHz Hardware Interfaces: GPIO, SPI, LCD, UART, I²C, I²S, Camera interface, IR, pulse counter, LED PWM, TWAI (compatible with ISO 11898-1), USB OTG 1.1, ADC, DAC, touch sensor, temperature sensor 40 MHz crystal oscillator 4 MB SPI flash Operating voltage/Power supply: 3.0 ~ 3.6 V Operating temperature range: –40 ~ 85 °C Dimensions: 18 × 31 × 3.3 mm Applications Generic Low-power IoT Sensor Hub Generic Low-power IoT Data Loggers Cameras for Video Streaming Over-the-top (OTT) Devices USB Devices Speech Recognition Image Recognition Mesh Network Home Automation Smart Home Control Panel Smart Building Industrial Automation Smart Agriculture Audio Applications Health Care Applications Wi-Fi-enabled Toys Wearable Electronics Retail & Catering Applications Smart POS Machines

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The ESP32-WROOM-32, measuring 25.2 x 18 mm only, contains the ESP32 SoC, flash memory, precision discrete components, and PCB antenna to provide outstanding RF performance in space-constrained applications. ESP32-WROOM-32 is a powerful, generic Wi-Fi + BT + BLE MCU module that targets a wide variety of applications, ranging from low-power sensor networks to the most demanding tasks, such as voice encoding, music streaming and MP3 decoding. At the core of this module is the ESP32-D0WDQ6 chip. The chip embedded is designed to be scalable and adaptive. There are two CPU cores that can be individually controlled, and the clock frequency is adjustable from 80 MHz to 240 MHz. The user may also power off the CPU and make use of the low-power co-processor to monitor the peripherals for changes or crossing of thresholds constantly. ESP32 integrates a rich set of peripherals, ranging from capacitive touch sensors, Hall sensors, SD card interface, Ethernet, high-speed SPI, UART, I²S and I²C. The integration of Bluetooth, Bluetooth LE and Wi-Fi ensures that a wide range of applications can be targeted and that the module is future proof. Using Wi-Fi allows a vast physical range and direct connection to the internet through a Wi-Fi router while using Bluetooth allows the user to conveniently connect to the phone or broadcast low energy beacons for its detection. The sleep current of the ESP32 chip is less than 5 µA, making it suitable for battery powered and wearable electronics applications. ESP32 supports a data rate of up to 150 Mbps, and 20.5 dBm output power at the antenna to ensure the broadest physical range. As such the chip does offer industry-leading specifications and the best performance for electronic integration, range, power consumption, and connectivity. Downloads Datasheet

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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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Complete ESP32 microcontroller learning course featuring a custom-designed MCU expansion board, hands-on projects, and a comprehensive online guide – perfect for learning hardware, programming, and connectivity step by step. A Practical Introduction to Embedded Systems with the ESP32 This course is designed for readers who are new to embedded systems and looking for a structured, example-driven way to get started. If you’ve explored general-purpose electronics or Arduino-based materials but found them too broad or lacking in practical guidance, this course offers a more focused alternative. Using the "ESP32 by Example Kit" (EEK) – a compact and affordable set of components featuring LEDs, sensors, an OLED display, and a motion processor – you’ll work with a consistent hardware setup throughout the course. Once assembled, the EEK stays mostly unchanged, allowing you to concentrate on learning and experimentation without constant reconfiguration. Topics include: Understanding and programming the ESP32 microcontroller Writing and deploying code with the Arduino IDE Exploring cyber-physical systems, culminating in basic drone control No prior experience with Arduino or embedded development is required. Each section features hands-on examples and mini-projects designed to reinforce key concepts and inspire deeper exploration. By the end of the course, you’ll be able not only to reproduce the book’s examples but also to build on them with your own ideas and applications. Whether you're interested in embedded programming, interactive systems, or introductory drone control, this course provides a clear and practical path to getting started. What you'll learn? Embedded programming with the ESP32 using the Arduino IDE Real-time sensor input and control via buttons, LEDs, and displays Gesture-based interaction using the MPU6050 motion sensor Bluetooth gamepad integration and drone control simulation Wi-Fi and UDP networking, local web servers, and NTP MQTT communication with cloud platforms like AWS and Arduino IoT How to build and deploy full-featured IoT systems Perfect for Students and self-learners exploring embedded systems Makers and IoT enthusiasts looking to improve their hardware skills Educators and trainers seeking ready-to-teach material Developers moving beyond Raspberry Pi or Arduino basics Support when you need it Access to instructors via Elektor Academy Helpful community forums and essential documentation What's inside the Box (Course)? New 384-page book: "ESP32 by Example" (valued at €45) Elektor ESP32 by Example Kit (EEK): Microcontroller Extension Board with 6 LEDs and 6 Buttons installed + OLED Display, MPU6050 3-axis Accelerometer and Gyroscope Module (valued at €40) Adafruit HUZZAH32 – ESP32 Feather MCU Board (valued at €30) ESP32 Cheap Yellow Display Board (valued at €25) DHT11 Humidity & Temperature Sensor Breadboard Jumper wires USB-C cable Access to the full course on the Elektor Academy Pro Learning Platform Instructional videos Downloadable Arduino project files for every module Learning Material (of this Box/Course) ▶  Click here to open Module 1 – Getting Started with the ESP32 & EEK Module 2 – Digital Output – LEDs and GPIO Module 3 – Switches and Input Handling Module 4 – EEK and PWM Module 5 – OLED and Display Output Module 6 – Motion Sensing with the MPU6050 Module 7 – Capstone Project (EEK in Action) Module 8 – WiFi and Web Control with ESP32 Module 9 – Cloud Concepts using EEK Module 10 – Hands-on: Arduino IoT Cloud and EEK Module 11 – BlueTooth and EEK GamePad Integration Module 12 – Why Drones? Module 13 – Drone Simulator Concepts Module 14 – Simple Drone Flight Control Module 15 – Real-Time Drone Flight Control Module 16 – Drone Control Mini-Projects Module 17 – Middleware and Python Scripting Module 18 – Python Applications for Drone Control Module 19 – Capstone EEK Control Project and Presentation About the Author Dr. Jim Solderitsch is an educator, software architect, systems developer, and cybersecurity researcher with a focus on cyber-physical systems. He currently serves as an Adjunct Professor in Computing Sciences at Villanova University in Pennsylvania. What is Elektor Academy Pro? Elektor Academy Pro delivers specialized learning solutions designed for professionals, engineering teams, and technical experts in the electronics and embedded systems industry. It enables individuals and organizations to expand their practical knowledge, enhance their skills, and stay ahead of the curve through high-quality resources and hands-on training tools. From real-world projects and expert-led courses to in-depth technical insights, Elektor empowers engineers to tackle today’s electronics and embedded systems challenges. Our educational offerings include Academy Books, Pro Boxes, Webinars, Conferences, and industry-focused B2B magazines – all created with professional development in mind. Whether you're an engineer, R&D specialist, or technical decision-maker, Elektor Academy Pro bridges the gap between theory and practice, helping you master emerging technologies and drive innovation within your organization.

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