ManosM @ instructables.com has build a portable ultrasonic range meter based on ATMega328 mcu and LCD display. This device is a small, portable ultrasonic range meter using an ATMega328 microcontroller, an ultrasonic module and a 4x20 LCD for ranging distances in meters and...

This simple circuit designed around Solid State Relay S216S02 from SHARP. The S216S02 solid State Relay (SSR) is an integration of an infrared emitting diode (IRED), a Phototraic Detector and a main output Traic. These devices are ideally suited for controlling high voltage AC loads...

Maurizio Di Paolo Emilio has pointed us to this latest article on why to choose Freescale mcu versus Microchip ones: The task of choosing the best micro for an application is not made easier by the multitude of suppliers you have at hand today, this being the drawback of having so...

sameer @ sgprojects.co.in has build a LPG gas detection circuit based on LM358: LPG gas detection project’s main idea is to implement the security system for detecting leakage of liquid petroleum gas in closed environment. In this project gas leakage is identified by using MQ6 gas...

Ken Boak has designed a compact board with RFduino Bluetooth Low Energy Module: This week I have been working on another of my standard footprint 50mm x 50mm boards - it is a general purpose wireless module carrier board:- Fobble. That's a BLE Fob - for anyone who misses the...

m0xpd @ m0xpd.blogspot.com has build a RF probe on a little PCB board. Today I finally got round to building a nice little RF probe kit from Rex, w1rex, the Tuna King over at QRPme. RF Probe -...

EswarD2 @ instructables.com has build an Arduino based door lock using Arduino UNO, a keypad and a servo motor. This a door lock built as fun project.It is quite easy to build and a fun way to learn and improve your knowledge of arduino.I tried to add a 16*2 display but there werent...

The MAX30102 pulse oximeter and heart rate integrated sensor module is claimed as the lowest power solution on the market today The MAX30102 is an integrated pulse oximetry and heart-rate monitor module. It includes internal LEDs, photodetectors, optical elements, and low-noise...