Principe

La valeur du capteur de lumière est affiche sur le LCD

Materiel

• Arduino UNO R3
• Afficheur I2C Batron BTHQ 21605AV-02 (DataSheet_afficheur_I2C)
• Capteur lumière phidget 1127 (Light_sensor_module_doc)

Cablage

Code source

#include <Wire.h>
#include <LCDI2C.h>

const int PIN_INPUT_SENSOR = A0;
int currentValue = 0;

//I2C display adress (found by I2C scanner
#define LCDI2C_ADDRESS 0x3B

//I2C display setup : Number of lines, char and i2c address of the display
LCDI2C lcd = LCDI2C(2,16,LCDI2C_ADDRESS);             

void setup()
{
  //Start I2C bus
  Wire.begin();

  //Init the display, clears the display
  lcd.init();
  lcd.printstr("Starting...");
}

void updateDisplayedValue()
{
  lcd.clear();
  lcd.printstr("Value");
  lcd.setCursor(1,0);
  String atexte=String(currentValue);
  char charBuf[50];
  atexte.toCharArray(charBuf, 50);
  lcd.printstr(charBuf);
}

void loop()
{
  //Read sensor value
  currentValue = analogRead(PIN_INPUT_SENSOR)*100;

  //update the display with new value
  updateDisplayedValue();

  //wait a little
  delay(150);
}

librairies

• LCDI2C : http://www.arduino.cc/playground/Code/LCDi2c
• Wire : http://www.arduino.cc/en/Reference/Wire
• Arduino beta 23