Erich Styger show us how to connect nRF24L01+ transceiver module with tinyK20 Board and how to use the command line to communicate with it. He  writes: I’m using the tiny and inexpensive Nordic Semiconductor nRF24L01+ transceiver (see “Tutorial: Nordic Semiconductor nRF24L01+...

This project provides a variable output power supply ranging from 1.2 to 37 V @ 1.5 A. Uses industry populer LM317 in TO3 package for delivering variable output voltage. Specifications  Input 40 VDC or 28V AC 2Amps Output : 1.2 to 37 V @ 1.5 A regulated low ripple DC...

by Clemens Valens @ elektormagazine.com The new SDR board was created by Burkhard Kainka, the designer who also did the first SDR project. The antenna preselector of the original board has been removed while the CY27EE16 programmable oscillator was replaced by the Si5351 from...

The LTC4125 is a simple and high performance monolithic full bridge resonant driver capable of delivering over 5W of power wirelessly to a properly tuned receiver. The device controls the current flow in a series connected transmit coil LC network to create a simple, safe and...

Alex @ obddiag.net has published a new open source OBD adapter which provides you a serial interface using the ELM327 command set and supports all OBD-II standards. The adapter kit schematic is shown here. It is built around NXP LPC1517 Cortex-M3 microprocessor with 64 kB program...

victoryking @ instructables.com has posted a nice physics and arduino tutorial on how to measure the mass of earth. This is an indirect method to calculate the mass of earth by measuring acceleration due to gravity with the help of arduino. One fine day, I was weighing my self on a...

Ethan Zonca has released the firmware and hardware of FeatherHAB. FeatherHAB is a small and inexpensive ballon GPS tracker. FeatherHAB is a lightweight, small, and inexpensive balloon tracker. It tracks the location of a balloon with GPS and broadcasts the balloon’s position to the...

morethanuser.blogspot.com has published a thermocouple thermostat based on ATmega8 and  MAX31855KASA Thermocouple to digital converter IC from Maxim. Here is a circuit, I used popular thermocouple type K and MAX31855KASA+ to interface it. I could also put some op amp, and connect to...