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 ...

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 ...

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 ...