EEssential

To power portable IoT modules, we need to regulate battery voltage to a stable voltage, usually 3.3V.   A LiPo pack is attractive: it can be...

A RC toy jeep is gutted and transplanted with a new controller, a Bluetooth communication module and new sensors. Toy RC Jeep Newbrigh...

High performance logic has long moved to very low voltages (sub 1V) demanded by nanoscale fabrication technology.  But a lot of systems stil...

For less than $1, I bought a HC-SR04 sonar module on eBay.  It can't get cheaper than this. I was a little disturbed first when I sa...

A simple linear battery charger that draws power from a USB port is designed for 14500 lithium ion battery (which is about the same size as ...

The 1W cool white (6000-6500K) and warm white (3000-3500K) LEDs are driven by 350mA.  The LEDs are mounted on 20mm Aluminum base heat sink p...

BeagleBone Black is a nice little board, but mine came with no HDMI display: the monitor could not detect a HDMI signal.  I tried different ...