SunFounder Pironman - Page 45

SunFounder Pironman
6.2.3 Raspberry Pi Status Monitoring
To turn off the Pironman U1, you need to press and hold the power button for 2 seconds until the button light turns
purple, then release.
At this point, Pironman U1 will send a shutdown signal to the Raspberry Pi via I2C. If you have followed the 1.
Download and Install SPC, the Raspberry Pi will then proceed with a safe shutdown.
After shutdown, the configured Raspberry Pi shutdown signal pin, GPIO26, will go low. Once the main board detects
this low signal, it cuts off the power to the Raspberry Pi.
In the spc program, the shutdown signal pin is set by adding the following line to the Raspberry Pi’s /boot/config.
txt file.
dtoverlay=gpio-poweroff,gpio_pin=26,active_low=0
The RPI STAT jumper cap connects the microcontroller’s shutdown signal with the Raspberry Pi’s GPIO26. You can
also remove this jumper cap to free up GPIO26. However, doing so means you won’t be able to perform a safe shutdown
of the Raspberry Pi.
6.2. Main Board 41