IO4: SDA (SHT40-AD1B-R2 0X40)
IO5: CC68_SS
IO12: LED1
IO13: LED2
IO14: CC68_RST
IO15: SCL (SHT40-AD1B-R2 0X40)
IO16: GPS_TX
IO17: GPS_RX
IO18: CC68_SCK
IO19: CC68_MISO
IO23: CC68_MOSI
IO32: J2_CAPACITIVE_INPUT
IO33: J4_CAPACITIVE_INPUT
IO34: CC68_BUSY
IO35: CC68_DIO1