MSFS2020 Arduino based control box with Python SimConnect interface

master.py

from datetime import datetime
from SimConnect import *
import serial
import struct

def logit(strIn):
  print(" " + datetime.now().strftime('%H:%M:%S.%f')[:-3] + " :  " + str(strIn))

def readLine():
  return arduino.readline().decode(encoding='UTF-8',errors='strict').strip()

def sendStatus(param,value):
  arduino.write(param.encode())
  if readLine() == param:
    arduino.write((str(value) + ";").encode())
  return readLine()
  
logit("Start")

arduino = serial.Serial('COM10', 9600)
logit("Serial Connected")

# N -> NAV1 RADIO
logit("NAV 1: " + sendStatus("N",111.005))

# O -> NAV2 RADIO
logit("NAV 2: " + sendStatus("O",112.150))

# R -> COM1 RADIO
logit("COM 1: " + sendStatus("R",123.45))

# S -> COM1 RADIO
logit("COM 2: " + sendStatus("S",121.328))



arduino.write("C".encode())
logit(readLine()) # Read the newest output from the Arduino

MSFS2020ControlBox

Ignore - Gist Naming File

pro-micro-pinout.txt

TXO  ->  USB (PC)
RXI  <-  USB (PC)
GND
GND
D2 SDA  --  I2C (LCD)
D3 SCL  --  I2C (LCD)
D4
D5
D6
D7
D8
D9

D10
D16
D14
D15
D18
D19
D20
D21
VCC
RESET
GND
RAW 5V

slave.ino

void setup() {
  Serial.begin(9600); // set the baud rate
  Serial.println("Ready"); // print "Ready" once
}
void loop() {
  char inByte = ' ';
  if(Serial.available()){ 
    // only send data back if data has been sent
    char inByte = Serial.read(); // read the incoming data
    float inFloat;
    switch (inByte) {
      case 78: // this is a NAV1
      case 79: // this is a NAV2
      case 82: // this is a COM1
      case 83: // this is a COM2
        Serial.println(inByte);
        inFloat = Serial.parseFloat(SKIP_NONE);
        Serial.read(); // trailing semi-colon
        Serial.print(inFloat, 3);
        Serial.println("");
        break;
      default:
        Serial.print("No Good, I received ASCII DEC: ");
        Serial.println(inByte, DEC);
        break;
    }
  }
}