Relays
The board has 4 electro-mechanical relays for analog output, each relay has own status LED. Relay
connectors have Normal open, Normal closed, and Common contacts.
Relay REL1 is connected to GPIO10
Relay REL2 to GPIO11
Relay REL3 goes to GPIO22
Relay REL4 to GPIO23
Inputs
The board has 4 optocouplers for analog input and each input has own status LED. The inputs have + and –
printed under the connector – make sure to first check the polarity or you might damage the board.
Opto OPT1 is connected to GPIO1
Opto OPT2 goes to GPIO2
Opto OPT3 is routed to GPIO3
Opto OPT4 is connected to GPIO15
User LED and button BUT1
The board has user LED and a button that can be used as boot button but also can be used as user button after
initial boot sequence.
LED is connected to GPIO8
Button BUT1 is connected to GPIO9
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