Raspberry Pi 4 ssh config

geiger.py

# based on https://www.instructables.com/Portable-Raspberry-Pi-Geiger-Counter-With-Display/
# geiger.py gets data from Mighty Ohm Geiger Counter and writes to a file geiger.dat on Raspberry Pi
import time
import datetime
import string 
import signal
import re
import serial
import os

class Geiger:
    def __init__(self):
        pass

    def readLine(self, port):
        r = ""
        while True:
            byte = port.read()
            c = byte.decode("utf-8")
            if c == '\n' or c == '\r' or c == '':
                return r
            else:
                r += c


if __name__ == '__main__':
    try:
        g = Geiger()
        c = 0
        f = open(f"{os.environ['HOME']}/geiger.dat", "w")
        # ttyS0 for rpi4
        # ttyAMA0 for Pi1, Pi2, Pi0
        # See https://pimylifeup.com/raspberry-pi-serial/
        port = serial.Serial("/dev/ttyS0", baudrate=9600, timeout=1)
        # Column headers
        # f.write("count CPS CPM uSv/hr\r\n")
        while True:
            r = g.readLine(port)
            if r != '':
                words = r.split(",")
                l = len(words)
                if l == 7:
                    # data should come back in the form
                    # CPS, n, CPM n, uSv/hr n, SPEED
                    # for debug:
                    # f.write('input = ' + r + '\r\n')
                    f.write(str(c) + words[1] + words[3] + words[5] + '\r\n')
                    f.flush()
                    c += 1

    except KeyboardInterrupt:
        f.close()
        print('closing script through ctrl-c')

ssh-config

Host <rpi-hostname>.local
     HostName <rpi-hostname>.local
     User <username>
     IdentityFile ~/.ssh/<rpi-ssh-secret-file>

Host *
  AddKeysToAgent yes
  UseKeychain yes