Chirp Arduino example

Chirp Arduino example

/*
Chirp - arduino example

Connection 
Chirp pin 1 - no connection
Chirp pin 2 - Arduino VCC
Chirp pin 3 - Arduino A5
Chirp pin 4 - Arduino A4
Chirp pin 5 - Arduino pin 2
Chirp pin 6 - Arduino GND
*/

#include <Wire.h>

void writeI2CRegister8bit(int addr, int value) {
  Wire.beginTransmission(addr);
  Wire.write(value);
  Wire.endTransmission();
}

unsigned int readI2CRegister16bit(int addr, int reg) {
  Wire.beginTransmission(addr);
  Wire.write(reg);
  Wire.endTransmission();
  delay(1100);
  Wire.requestFrom(addr, 2);
  unsigned int t = Wire.read() << 8;
  t = t | Wire.read();
  return t;
}

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

  pinMode(2, OUTPUT);
  digitalWrite(2, LOW); //Reset the Chirp
  //delay(1); maybe allow some time for chirp to reset
  digitalWrite(2, HIGH); //Go out from reset
  writeI2CRegister8bit(0x20, 3); //send something on the I2C bus
  delay(1000); //allow chirp to boot
}

void loop() {
  Serial.println(readI2CRegister16bit(0x20, 0)); //read capacitance register
  //writeI2CRegister8bit(0x20, 3); //request light measurement 
  //delay(9000);                   //this can take a while
  //Serial.print(", ");
  //Serial.println(readI2CRegister16bit(0x20, 4)); //read light register
  delay(500);
}