Serial Comunication raspberry pi and arduino

note.md

Serial Comunication raspberry pi and arduino

Arduino serial communication with Raspi or computer with python Please read python format characters and Arduino data types

serial.ino

union {
  struct {
    int data1;
    int data2;
    int data3;
  } param;
  byte packet[6];
} data;

union {
  struct {
    int data1;
    int data2;
    int data3;
  } param;
  byte packet[6];
} dataRecv;

void setup() {
  // put your setup code here, to run once:
Serial.begin(57600);
pinMode(2, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  data.param.data1 = 1;
  data.param.data2 = 2;
  data.param.data3 = 3;

  Serial.write(data.packet, sizeof(data.packet));

  if (Serial.available()) {
    Serial.readBytes(dataRecv.packet, sizeof(dataRecv.packet));
  }

  delay(100);
}

serial.py

#!/usr/bin/env python3

import serial
from time import sleep
from struct import unpack, pack

ser = serial.Serial('/dev/ttyACM0', 57600)  # open serial port

def sendData(data1, data2, data3):
    dataPacket = pack("hhh", data1, data2, data3)
    ser.write(dataPacket)

while True:
    dataRaw = ser.read(6) #6 ===> 2 x 3 of short data types (2 Bytes)
    print(dataRaw)
    data1, data2, data3 = unpack("hhh", dataRaw) #hhh for short ===> int (in arduino [atmel microprocessors]) = short in python, they have same size, 2 Bytes
    print(f"data1: {data1}")
    print(f"data2: {data2}")
    print(f"data3: {data3}")

    sendData(3, 5, 7)

    sleep(0.1)