Search results for ":time"
Witty Pi 4 - Real-time Clock and Power Management for Raspberry Pi
Witty Pi is an add-on board that adds realtime clock and power management to your Raspberry Pi. It can define your Raspberry Pi’s ON/OFF sequence, and significantly reduce the energy usage. Witty Pi 4 is the fourth generation of Witty Pi and it has these hardware resources onboard: Factory calibrated and temperature compensated realtime clock with ±2 ppm accuracy. Dedicated temperature sensor with 0.125 °C resolution. On-board DC/DC converter that accepts up to 30 V DC. AVR 8-bit microcontroller (MCU) with 8 KB programmable flash. Accurate realtime clock and ON/OFF scheduling The realtime clock (RTC) on Witty Pi 4 has been calibrated in the factory and Witty Pi 4’s firmware also makes temperature compensation for the crystal. This makes the RTC very accurate and the actual annual error is limited within ±2 ppm. When your Raspberry Pi boots up, the time stored in the RTC will overwrite the system time. As a result, your Raspberry Pi knows the correct time even without accessing the Internet. You can schedule the startup and/or shutdown of your Raspberry Pi, and make it a time-controlled device. You can even define a schedule script to schedule complicated ON/OFF sequence for your Raspberry Pi. Scheduling the ON/OFF sequence for Raspberry Pi is the most popular feature of Witty Pi, and it is extremely useful for systems that powered by battery. By only turning on Raspberry Pi when necessary, the battery can be used way much longer with Witty Pi installed. Temperature-controlled device The temperature sensor on Witty Pi 4 has 0.125 °C resolution. The temperature data is used for compensating the crystal and make the RTC more accurate. You can also specific the action (startup or shutdown) when temperature goes above or below the preset threshold. Which means you can also make your Raspberry Pi a temperature-controlled device. DC/DC converter and e-latching power switch Witty Pi 4 comes with a DC/DC converter on board, which allows you to power your device with 6~30V power supply. You can also power your device with 5 V via the USB type C connector. Witty Pi 4 also implements an e-Latching power switch, which is very similar to the power switch on your PC/Laptop computer. You can gracefully turn on/off your Raspberry Pi with a single tap on the button. The software running in background will execute the shutdown command before the power gets cut, this avoid the data corruption caused by hard shutdown. Witty Pi 4 supports all Raspberry Pi models that has the 40-pin GPIO header, including A+, B+, 2B, Zero, Zero W, Zero 2 W, 3B, 3B+, 3A+ and 4B. You will need to solder the 40-pin header to Zero/Zero W/Zero 2 W model beforehand, so they can make reliable connection with Witty Pi. Single I²C device Witty Pi 4 uses MCU to emulate a single I²C device with default address 0x08, and also map all I²C registers in realtime clock and temperature sensor as virtual I²C registers in the same device. You can access all I²C registers in realtime clock and temperature sensor via the single I²C device emulated by Witty Pi 4. The advantage of this new design is that Witty Pi 4 hides other I²C devices (realtime clock, temperature sensor) and becomes the proxy of them to talk to Raspberry Pi. Because the I²C address used by Witty Pi 4 can be changed to any value, you can always avoid the I²C address conflicting. UWI support Witty Pi 4 is fully supported by UWI (UUGear Web Interface), and you can access you Witty Pi 4 on any device that have network access. Specifications Microcontroller ATtiny841 (datasheet) Realtime Clock PCF85063A (datasheet), calibrated in factory Temperature Sensor LM75B (datasheet) DC/DC Converter MP4462 (datasheet) MOSFET Switch AO4616 (datasheet) Battery CR2032 (for time keeping when power supply is disconnected) Power In DC 5 V (via USB type C connector)or DC 6 V~30 V (via XH2.54 connector) Output Current Up to 3 A for Raspberry Pi and its peripherals Standby Current ~0.5 mA Operating Environment Temperature -30°C~80°C (-22°F~176°F)Humidity 0~80% RH, no condensing, no corrosive gas Dimension 65 x 56 x 19 mm Weight 23 g (without accessories) Included 1x Witty Pi 4 board 1x CR2032 battery 4x M2.5 x 11mm Copper Standoff 8x M2.5 screws Downloads User manual GitHub
€ 44,95
Members € 40,46
Seeed Studio Seeed Studio Grove Time of Flight Distance Sensor (VL53L0X)
Grove - Time of Flight Distance Sensor-VL53L0X is a high speed, high accuracy and long range distance sensor based on VL53L0X. The VL53L0X is a new generation Time-of-Flight (ToF) laser-ranging module and it is one of the smallest on the market today. It provides accurate distance measurement independent of the target reflectances, making it superior to other conventional technologies. It can measure absolute distances up to 2 m, raising the standards in ranging performance levels and allowing various new applications. The VL53L0X integrates a leading-edge SPAD array (Single Photon Avalanche Diodes) and embeds ST’s second generation Flight SenseTM patented technology. The VL53L0X’s 940 nm VCSEL emitter (Vertical-Cavity Surface-Emitting Laser), is totally invisible to the human eye, coupled with internal physical infrared filters, it enables longer ranging distances, higher immunity to ambient light, and better robustness to cover glass optical crosstalk. Features VCSEL driver Ranging sensor with advanced embedded microcontroller Advanced embedded optical cross-talk compensation to simplify cover glass selection Safe for eyes: Class 1 laser device compliant with latest standard IEC 60825-1:2014 - 3rd edition Single power supply I²C interface for device control and data transfer Xshutdown (reset) and interrupt GPIO Programmable I²C address Working voltage: 3.3 V / 5 V Working temperature: 20 ℃ - 70 ℃ Recommended measurement distance: 30 mm - 1000 mm Default I²C address: 0x52 Included 1x Grove - Time of Flight Distance Sensor-VL53L0X 1x Grove Cable
€ 19,95
Members € 17,96
Evil Mad Science The 555SE Discrete 555 Timer
The 555SE is an easy-to-build surface-mount soldering kit. It includes the circuit board, resistors, and transistors that make up the electrical circuit and printed assembly instructions. The kit also comes complete with the 'IC Leg' stand and 8 colour-coded thumbscrew terminal posts. To build the 555SE, basic electronic soldering skill and tools are required, but no additional knowledge of electronics is presumed or required. You provide standard surface-mount soldering tools: a soldering iron, solder (wire or paste), small metal tweezers, as well as a Phillips head screwdriver. The kit features relatively large surface mount components (1206 and SOT-23) and is a great first surface-mount soldering kit if you're just getting started. However, if you are experienced at surface mount soldering and have tools like a hot air rework station or other equipment, you're welcome to use them for assembling this kit. Features Anodized aluminium stand 8x 4-40 surface-mount threaded inserts Stainless steel thumbscrews with colour-coded plastic caps (1 red, 1 black, 6 grey) All materials (including the circuit board and stand) are RoHS compliant (lead-free) Dimensions: 6.5 cm × 5.2 cm x 1.6 mm Dimensions assembled: 6.5 cm × 7.8 cm × 2.0 cm
€ 44,95
Members € 40,46
Evil Mad Science The Three Fives 555 Discrete Timer Kit
The kit is a faithful and functional transistor-scale replica of the classic NE555 timer integrated circuit, one of the most classic, popular, and all-around useful chips of all time. The kit is designed to resemble an (overgrown) integrated circuit, based around an extra-thick matte-finish printed circuit board. The stand – which gives the circuit board eight legs in the shape of DIP-packaged integrated circuit pins – is made from machined and formed semi-rigid PVC foam.
€ 49,95
Members € 44,96
JYE Tech JYE Tech Capacitance Meter DIY Kit
Features Accuracy better than 2% Measure range: 1pF - 500uF Automatic range switch Zeroing available Real time serial output of measurement read-outs with time stamp Low cost and easy to build Weight: 40g
€ 24,95
Members € 22,46
Raspberry Pi 5 Essentials
Program, build, and master over 60 projects with Python The Raspberry Pi 5 is the latest single-board computer from the Raspberry Pi Foundation. It can be used in many applications, such as in audio and video media centers, as a desktop computer, in industrial controllers, robotics, and in many domestic and commercial applications. In addition to the well-established features found in other Raspberry Pi computers, the Raspberry Pi 5 offers Wi-Fi and Bluetooth (classic and BLE), which makes it a perfect match for IoT as well as in remote and Internet-based control and monitoring applications. It is now possible to develop many real-time projects such as audio digital signal processing, real-time digital filtering, real-time digital control and monitoring, and many other real-time operations using this tiny powerhouse. The book starts with an introduction to the Raspberry Pi 5 computer and covers the important topics of accessing the computer locally and remotely. Use of the console language commands as well as accessing and using the desktop GUI are described with working examples. The remaining parts of the book cover many Raspberry Pi 5-based hardware projects using components and devices such as LEDs and buzzers LCDs Ultrasonic sensors Temperature and atmospheric pressure sensors The Sense HAT Camera modules Example projects are given using Wi-Fi and Bluetooth modules to send and receive data from smartphones and PCs, and sending real-time temperature and atmospheric pressure data to the cloud. All projects given in the book have been fully tested for correct operation. Only basic programming and electronics experience are required to follow the projects. Brief descriptions, block diagrams, detailed circuit diagrams, and full Python program listings are given for all projects described.
€ 34,95
Members € 31,46
Elektor Digital PID-based Practical Digital Control with Raspberry Pi and Arduino Uno (E-book)
The Arduino Uno is an open-source microcontroller development system encompassing hardware, an Integrated Development Environment (IDE), and a vast number of libraries. It is supported by an enormous community of programmers, electronic engineers, enthusiasts, and academics. The libraries in particular really smooth Arduino programming and reduce programming time. What’s more, the libraries greatly facilitate testing your programs since most come fully tested and working. The Raspberry Pi 4 can be used in many applications such as audio and video media devices. It also works in industrial controllers, robotics, games, and in many domestic and commercial applications. The Raspberry Pi 4 also offers Wi-Fi and Bluetooth capability which makes it great for remote and Internet-based control and monitoring applications. This book is about using both the Raspberry Pi 4 and the Arduino Uno in PID-based automatic control applications. The book starts with basic theory of the control systems and feedback control. Working and tested projects are given for controlling real-life systems using PID controllers. The open-loop step time response, tuning the PID parameters, and the closed-loop time response of the developed systems are discussed together with the block diagrams, circuit diagrams, PID controller algorithms, and the full program listings for both the Raspberry Pi and the Arduino Uno. The projects given in the book aim to teach the theory and applications of PID controllers and can be modified easily as desired for other applications. The projects given for the Raspberry Pi 4 should work with all other models of Raspberry Pi family. The book covers the following topics: Open-loop and closed-loop control systems Analog and digital sensors Transfer functions and continuous-time systems First-order and second-order system time responses Discrete-time digital systems Continuous-time PID controllers Discrete-time PID controllers ON-OFF temperature control with Raspberry Pi and Arduino Uno PID-based temperature control with Raspberry Pi and Arduino Uno PID-based DC motor control with Raspberry Pi and Arduino Uno PID-based water level control with Raspberry Pi and Arduino Uno PID-based LED-LDR brightness control with Raspberry Pi and Arduino Uno
€ 29,95
Members € 23,96
Pieye Nimbus 3D ToF Camera Module for Raspberry Pi
Time-of-Flight Measuring principle The time-of-flight technology has been successfully established on the market for many years. Nimbus 3D is now making this technology available for the first time for the Raspberry Pi. With time-of-flight technology, the distance between objects and the camera is measured via the light propagation time using modulated light pulses. Applications The compact design opens up a multitude of new applications. From people counting to gesture control to surveying tasks, there is no limit to the imagination. Open source software Together with open-source software and the connection to the Raspberry Pi Linux kernel, Nimbus 3D is a ready out-of-the-box solution. The included sample code for python, javascript and C completes the plug-and-play experience. And best of all: the complete software is open-source! Join the community at github.com and contribute your part to the development of nimbus 3D. Technical specifications Resolution: 352 x 288 Measuring range: 0.1 m - 5 m Angle of view: 66° x 54° (H x V) Framerate: up to 30fps Imager: Infineon REAL3 IRS1125A Output: 3D point cloud, amplitude, radial and confidence
€ 309,00
Members € 278,10
OWON OWON VDS6102A 2-ch USB Oscilloscope (100 MHz)
Features Bandwidth 100 MHz Vertical resolution 14 bits Rise time ≤3.5 ns Memory 10 Mpts Number of channels 2 channels + 1 channel function generator Horizontal scale 5ns - 100s/div Sample rate Max. 1 GSa/s Maximum voltage 40 V (peak - peak) Automatic measurements Vpp, Vavg, Vamp, Vrms, Freq, Period, Vmax, Vmin, Vtop, Vbase, Overshoot, Preshoot, Rise Time, Connectivity USB (type C), LAN, Wifi (optional) Fall Time, Delay A→B↑, Delay A→B↓, +Width, -Width, +Duty, -Duty Bandwidth 5 MHz Dimensions 190 x 120 x 18mm Weight ~380 g Sample rate 25 MSa/s Standard waveforms Sine (0.1 Hz - 5 MHz), Square (0.1 Hz - 200 kHz), Ramp (1 Hz - 10 kHz), Pulse (1 Hz - 10 kHz) Resolution 10 bits DC offset range (AC + DC) ±2.5 V Amplitude range 10 mVpp - 5 Vpp
€ 329,00
Members € 296,10
Elektor Digital Raspberry Pi 5 Essentials (E-book)
Program, build, and master over 60 projects with Python The Raspberry Pi 5 is the latest single-board computer from the Raspberry Pi Foundation. It can be used in many applications, such as in audio and video media centers, as a desktop computer, in industrial controllers, robotics, and in many domestic and commercial applications. In addition to the well-established features found in other Raspberry Pi computers, the Raspberry Pi 5 offers Wi-Fi and Bluetooth (classic and BLE), which makes it a perfect match for IoT as well as in remote and Internet-based control and monitoring applications. It is now possible to develop many real-time projects such as audio digital signal processing, real-time digital filtering, real-time digital control and monitoring, and many other real-time operations using this tiny powerhouse. The book starts with an introduction to the Raspberry Pi 5 computer and covers the important topics of accessing the computer locally and remotely. Use of the console language commands as well as accessing and using the desktop GUI are described with working examples. The remaining parts of the book cover many Raspberry Pi 5-based hardware projects using components and devices such as LEDs and buzzers LCDs Ultrasonic sensors Temperature and atmospheric pressure sensors The Sense HAT Camera modules Example projects are given using Wi-Fi and Bluetooth modules to send and receive data from smartphones and PCs, and sending real-time temperature and atmospheric pressure data to the cloud. All projects given in the book have been fully tested for correct operation. Only basic programming and electronics experience are required to follow the projects. Brief descriptions, block diagrams, detailed circuit diagrams, and full Python program listings are given for all projects described.
€ 29,95
Members € 23,96
JOY-iT JOY-iT VAX-1030 Wireless Multifunction Meter
Voltage Range 0 V - 100 V Voltage Resolution 0.01 V Voltage Accuracy ± 2% - 3 Digit Current Range 1 A - 30 A Current Resolution 0.01 A Power Range 0 W - 200 kW Power Resolution 0.001 W Working Measuring Range 0 W - 4000 kWh Working Measuring Resolution 0.001 Wh Load Display Range 0 Ah - 2000 kWh Load Display Resolution 0.001 Ah Temperature Range -20 °C - 120 °C Time Range 0 - 99 days Time Resolution 1 sec Negative Overcurrent Protection 0 A - -300 A Positive Overcurrent Protection 0 A - 300 A Overvoltage Protection (OVP) 0 V - 100 V Undervoltage Protection (LVP) 0 V - 100 V Protection Delay Time 0 - 10 sec Relays Internal Communication Channels A - Z (26 channels) Address Range 01 - 99 Communication Range Up to 10 m Dimensions 113.2 mm x 57.2 mm x 48.8 mm Weight 315 g
€ 42,95
Members € 38,66
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, by Clemens Valens Review: The Andonstar AD249S-M Digital Microscope Magnifies Up To 2040 Times
The Andonstar AD249S-M is a digital microscope with a 10” display and a magnification factor of up to 2040 times. It comes with three lenses,...