This toy organ for children uses a readily-available force-sensitive resistor (FSR) and an NE555 timer IC. Resistance of the FSR varies with the amount...
This portable emergency light is based on a DC-to-DC booster module and a power bank. The emergency light is designed to provide sufficient illumination...
The circuit presented here can be used to drive USB-powered smart devices, including smartphones, while riding a bicycle. Smartphones suck battery power extremely fast,...
Here is a simple DC electric motor variable speed controller circuit that can be configured to control the sweep rate of automobiles’ windscreen wipers.
The...
Described here is an easy-to-use circuit of an automatic infrared (IR) faucet controller suitable for hand hygiene and water conservation at homes, hospitals and...
Presented here is an obstacle-avoidance robot without microcontroller (MCU). The obstacle-avoidance feature is commonly found in autonomous cars and robots. Most obstacle-avoidance robots are...