One of the most useful things you can do with an Arduino is control higher voltage (120-240V) devices like pumps, fans, lights, heaters etc. Since the Arduino operates at 5V it can’t control these ...

Have you ever needed to power a 12-volt relay in a circuit but only had 6 or 9 volts available? This simple circuit will solve that problem. It allows 12-volt relays to be operated from 6 or 9 volts, ...

This circuit works by using that principle to provide a short burst of twice the supply voltage to move the contacts and then applies the available 6 or 9 volts to the relay to lock the contacts in ...

An actual-size PCB layout for the timer kit is shown in Fig. 3 and its components layout in Fig. 4. Connect the Arduino Uno board and LCD1 as shown in the schematic diagram. Make sure that you first ...

Here is a simple list of what you will need to start. Arduino UNO R3 Development Board. RC522 RFID Reader. RFID Cards or Tags. Solenoid Door Lock. Single Channel Relay Module. 16x2 LCD Display along ...