LoRa Portable Node

This is a small circuit board with single line sockets for a Lora FeatherWing and a Raspberry Pi Pico.

Pinouts

LoRa FeatherWing	Pin	Pin	Raspberry Pi Pico	Comment
NC first 3	14-16	n/a	n/a
SPI PICO	12	25	SPI0 TX
SPI POCI	13	21	SPI0 Rx
SPI SCLK	11	24	SPI0 SCLK
unused	10
unused	9
unused	8
unused	7
unused	6	22	SPI0 CS	connect RFM 6 to central CS
unused	5
GND	4	23,28	GND	23 used to RFM, 28 for tri-colour LED
unused	3
3.3V	2	36	3.3V OUT	using jumper wire
NC (?reset)	1
n/a		26	GP20 - LED blue
n/a		27	GP21 - LED green
n/a		28	GND to LED
n/a		29	GP23 - LED red

Shuffling Pico down, I can preserve the idea that GND is passed straight through.

Code to run from Micropython shell:

from machine import SPI, Pin, PWM
from micropython_rfm9x import *
spi = SPI(0, baudrate=10_000, sck=Pin(18), mosi=Pin(19), miso=Pin(16))
cs = Pin(17, mode=Pin.OUT, value=1)
reset = Pin(26, mode=Pin.OUT, value=1) # GP26 not used

red = PWM(Pin(22), 1000)
green = PWM(Pin(21), 1000)
blue = PWM(Pin(20), 1000)
red.duty_u16(200)
green.duty_u16(200)
blue.duty_u16(200)

freq = 433.2
with_header= True
rfm = RFM9x(spi, cs, reset, freq, high_power=True)
rfm.tx_power = 6
time.sleep(3)
print(rfm.frequency_mhz)
red.duty_u16(1000)