I’m looking at adding a motion sensor to a Lora32 T3_1.6.1 board and trying to figure out the best pinned out GPIO to use that doesn’t interfere with or preclude any other possible peripherals.
Looking at various documents, here’s what I’ve found:
GPIO00 - has strapping requirements so not safe
GPIO01 - UART boot output
GPIO02 - SD/TF
GPIO03 - High at boot
GPIO04 - seems attached to SD/TF
GPIO12 - used for the input button by Meshtastic
GPIO13 - Looks free?
GPIO14 - suspicious boot pin
GPIO15 - suspicious boot pin
GPIO19 - SPI
GPIO21 - SPI/I2C
GPIO22 - SPI/I2C
GPIO23 - SPI
GPIO34 - input only
GPIO35 - input only - Connected to BAT+ through voltage divider
GPIO36 - input only - S_VN - sensor pins
GPIO39 - input only - S_VP - sensor pins
So it looks like the best pin for a sensor input would be GPIO34, with the next general use pin being GPIO13.
Anybody else see any issues?
This seems like it should be in the hardware wiki so all of us don’t need to repeatedly fumble through this activity.