Automatic LED Night Light
Inspired by a Chinese design, recently I built a small automatic LED night light with the help of a few generally available inexpensive components. Shown below is the base schematic of that automatic White LED […]
Microwave Radar Motion Sensor Switch
Presented here is an automatic motion sensor switch built around a cheap ‘Doppler Microwave Radar Sensor’ that can be easily used as standalone detection sensor. The circuit, designed as an alternative to the common PIR […]
3V3 uC Power Supply
Nowadays most electronics hobbyists require a precision 3.3V power supply module for their microcontroller (uC) and/or internet of things (IoT) projects. The traditional linear power supply is not a good choice in many situations because […]
Poorman’s Laser Diode Driver
Recently I got a couple of powerful laser diodes from a friend abroad. The ‘invisible’ (infrared) laser diodes with 1000mW and 2000mW power (808nm wavelength) are good for numerous applications like solid-state laser excitation, infrared […]
Universal Relay Module
Here is the circuit of a do it yourself universal relay module for microcontroller projects. One advantage of this design is that it can work with both active-high and active-low TTL signals from the I/O […]
WiFi Relay Module Primer – Part 1
Most modern wireless experimenter kits comes as modules that just plug together rather than individual components. Electronic newbies, practicing engineers, and experienced hands alike are sure to find that these inexpensive modules interesting. Recently I […]
Efficient Snake Repeller
Solar electronic snake repellent presented here is a proven solution to keep all poisonous snakes out of dog kennels, stables, etc. All you need is to simply place the device on the ground to remove […]
Automatic Fan Switch with PIR Motion Sensor
Here is one interesting circuit of an automatic, passive infrared motion sensor controlled, speed regulator switch for ceiling fans. The circuit, designed for AC230V operation is realized using generally available discrete components, and optimized for […]
Simple DVM Voltage Reference
Validating the calibration of an electronic test and measurement instrument such as a digital voltmeter (DVM) is very crucial especially after many years of service. Nowadays, it is easy to build a compact voltage reference […]
Nano Digital Volt Meter
Nano Digital Volt Meter is a microcontroller based simple DIY project for electronics hobbyists and makers. It is a compact digital voltmeter which can incisively measure input dc voltages in 0 to 55V range. The […]