Premiers Pas avec Raspberry Pi et Arduino

Collecte de mesures avec un Arduino Raspberry Pi

Interfacer le Raspberry Pi et une carte Arduino peut être utile pour de nombreux projets (M2M, Robotique, ...).

• Via USB : http://blog.oscarliang.net/connect-raspberry-pi-and-arduino-usb-cable/
• Via GPIO : http://blog.oscarliang.net/raspberry-pi-and-arduino-connected-serial-gpio/

Read http://playground.arduino.cc/Interfacing/Python

Install pySerial

sudo apt-get install python-serial

Check the Arduino tty port

ls /dev/tty*

Download the following sketch on the Arduino board (using the Arduino IDE)

void setup() {
  Serial.begin(9600);
}

void loop() {
  int sensorValue = analogRead(A0);
  Serial.println(sensorValue);
  delay(1000);
}

Run the following python script

import serial
ser = serial.Serial('/dev/ttyACM0', 9600)
while True :
    print ser.readline()

More test

Download the following sketch on the Arduino board (using the Arduino IDE)

// from http://blog.oscarliang.net/connect-raspberry-pi-and-arduino-usb-cable/
const int ledPin = 13;
	 
void setup(){
  pinMode(ledPin, OUTPUT);
  Serial.begin(9600);
}
void loop(){
  if (Serial.available())  {
     light(Serial.read() - '0');
  }
  delay(500);
}
	 
void light(int n){
  for (int i = 0; i < n; i++)  {
    digitalWrite(ledPin, HIGH);
    delay(100);
    digitalWrite(ledPin, LOW);
   delay(100);
  }
}

Run the following python script

import serial
ser = serial.Serial('/dev/ttyACM0', 9600)
ser.write('10')

More with Firmata : https://github.com/lupeke/python-firmata/

Download the firmata sketch on the Arduino board (using the Arduino IDE > Examples > Firmata > StandardFirmata)

Run the following python script

from firmata import *

a = Arduino('/dev/ttyACM0')
a.pin_mode(13, firmata.OUTPUT)
a.delay(2)

while True:
    a.digital_write(13, firmata.HIGH)
    a.delay(2)
    a.digital_write(13, firmata.LOW)
    a.delay(2)