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Auto light switch for bathroom using laser and IC4017

220V Auto room light switch using Arduino and Laser (Visitor counter)

AC 220V Frequency counter using arduino

Fridge door alarm circuit with delay time

1.5V Electric fly zapper circuit

220v AC timer using IC 555

Running small 220v lamp by 1.5v battery

Simplest heat sensor using NTC

Turn ON-OFF 220v electric appliances by any IR remote control

220V ON-OFF Latching touch switch by one touch plate only

LED chaser with only one IC555

Roulette circuit with touch switch using IC4017

2 Lamps, 2 switchs, 1 wire

Wireless power transmitter using IC555

Phone ringer circuit

Sequential LED flasher using IC 4017 (KNIGHT READER)

Arduino Gas leakage sensor with LCD display