8 Channel Relay Board Circuit Diagram. 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. This board can also be used as an add on card for the various development board that we provide.
Internal circuit diagram for eight channel relay module. 8 channel relay board is a simple and convenient way to interface 8 relays for switching application in your project. The 8 channel relay module has its own optocoupler also called opto isolator photocoupler or optical isolator.
Each relay on the board has the same circuit and the input ground is common to all eight channels.
The circuit on the board is as follows. Robust design using npn transistor to drive each relay. Internal circuit diagram for eight channel relay module. The driver circuit for this relay module is slightly different compared to traditional relay driving circuits since there is an optional additional.
