In GreenIQ v2 the GPIO mapping is as follows:
[Irrigation channel – CPU pin – 26 pin header pin]
CH1 – GPIO4 – pin 7
CH2 – GPIO17 – pin 11
CH3 – GPIO18 – pin 12
CH4 – GPIO27 – pin 13
CH5 – GPIO22 – pin 15
CH6 – GPIO23 – pin 16
CH7 – GPIO24 – pin 18
Light – GPIO25 – pin 22
Rain Sensor – GPIO15 – pin 10
Network LED (active ‘1’) – GPIO7 – pin 26
Irrigation channels are simple “opto relay”s that pass the 24VAC to the output, similar to the OSPi board but skipping the SPI GPIO expander, direct control.