Hi, I'm Bill. I'm a software developer with a passion for making and electronics. I do a lot of things and here is where I ...

This Arduino Uno setup can be powered by a 6F22 9V battery or other suitable power source ... The VCC and JD-VCC pins are the power supply input pins of the relay module. You can take the jumper cap ...

That is why you must use an external power supply (Vcc) that is between 7 to 12 volts to power up the Arduino board and the transistor + relay. The load uses its own power supply, for instance if you ...