The Arduino & I2C Relay Control Board is essentially an over sized Arduino shield that includes power regulation and relay driver circuitry, and brings all required off board connectivity to the backplane. Backplane connector J5 is designed specifically for the Arduino & I2C Relay Control Board.
As shown below, most power regulation and relay driver circuitry is mounted on the front side of the Arduino & I2C Relay Control Board.
The Arduino Mega plugs into the rear side of the Arduino & I2C Relay Control Board as shown below.
The complete schematic for the Arduino & I2C Relay Control Board is here. The schematic should be self-explanatory.
The Arduino & I2C Relay Control Board with Arduino Mega is installed in J5 on the backplane and fits snugly behind the LCDs as shown in the photos below.
A StarTech.com 3 ft Panel Mount USB Cable B to B – F/M – Panel Mount USB Extension USB-B Female to USB-B Male Adapter Cable – USB-B (F) Port (USBPNLBFBM3) provides the rear panel mount USB-B Female connector and extends this to a USB-B Male connector that plugs into the Arduino Mega. This is a very flexible cable and the excess cable is easily managed underneath the backplane board.
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