I have in my notes that pin 15:GPIO22 on the GoPiGo3 40 pin header is the RPI_Shutdown (button)
GoPiGo3 - Raspberry Pi Interface
13v3: RPI+3v3
2:5V: 5V supply
3:GPIO2: SDA_3v3
4:5V: 5V supply
5:GPIO3: SCL_3v3
8:GPIO14: RPI_TX
10:GPIO15: RPI_RX
12:GPIO18: RPI_RESET
15:GPIO22: RPI_Shutdown (button)
16:GPIO23: RPI_RUNNING
18:GPIO24: RPI_SWDIO
19:GPIO10: RPI_MOSI
21:GPIO9: RPI_MISO
22:GPIO25: RPI_SWDCLK
23:GPIO11:RPI_SCK
26:GPIO7: RPI_SS
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cleoqc
2
This is a pretty old tutorial but it can easily be adapted
And indeed use GPIO pin 22 to trigger an automated shutdown. It will automatically call gopigo3_power.py which is already running in the background.
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