SunFounder Pironman - Page 51

SunFounder Pironman
sudo nano /boot/firmware/config.txt
– Add rtc_bbat_vchg to /boot/firmware/config.txt.
dtparam=rtc_bbat_vchg=3000000
• After rebooting, the system will display:
pi@raspberrypi:~ $ cat /sys/devices/platform/soc/soc:rpi_rtc/rtc/rtc0/charging_
˓→voltage
3000000
pi@raspberrypi:~ $ cat /sys/devices/platform/soc/soc:rpi_rtc/rtc/rtc0/charging_
˓→voltage_max
4400000
pi@raspberrypi:~ $ cat /sys/devices/platform/soc/soc:rpi_rtc/rtc/rtc0/charging_
˓→voltage_min
1300000
This confirms the battery is now under trickle charging. To disable this feature, simply remove the dtparam line from
config.txt.
6.2.7 Pin Headers
The Pironman U1 extends the GPIO of the Raspberry Pi, but note that the Pironman U1 utilizes some of these pins.
You can choose to disable certain features according to your needs to free up these pins.
Pironman U1 Raspberry Pi
IR Receiver(Optional) GPIO16(Optional)
I2C SDA SDA
I2C SCL SCL
Soft Shutdown Status Monitoring GPIO26(Optional)
6.2. Main Board 47