Remote Operated Switch
To make a remote operated switch, you need to understand following circuits. I recommend you.
components
How to use variable resistors
How to use a preset? There are 3 pins/terminals on a preset. The maximum resistance.
How to use a relay
A relay is an electrically operated switch. Current flowing through the coil of the relay creates.
Object counter using LDR and calculator
To make an object counter we can use a simple dark detector circuit and a.