8 Channel Relay Board Circuit Diagram. It can be used to control various appliances and equipment with large current. Relay on indicator led for each of the eight relays.
Optocoupler is a component that transfers electrical signals between two state of isolation circuits by using light and prevent high voltage from affecting the system receiving the signal. Relay on indicator led for each of the eight relays. 8 channel relay board is a simple and convenient way to interface 8 relays for switching application in your project.
Connect the signal terminal in4 in5 of 8 channel relay to digital port 3 2 of the sunfounder arduino mega2560 board and connect an led at the output terminal pay attention to that there are only two submodules of the 8 channel relay are used in this example but you can use the 8 submodules freely 8 channel relay arduino mega2560.
The driver circuit for this relay module is slightly different compared to traditional relay driving circuits since there is an optional additional. Optocoupler is a component that transfers electrical signals between two state of isolation circuits by using light and prevent high voltage from affecting the system receiving the signal. Connect the signal terminal in4 in5 of 8 channel relay to digital port 3 2 of the sunfounder arduino mega2560 board and connect an led at the output terminal pay attention to that there are only two submodules of the 8 channel relay are used in this example but you can use the 8 submodules freely 8 channel relay arduino mega2560. Each relay on the board has the same circuit and the input ground is common to all eight channels.
