Ambient LightセンサーISL29034をArduinoから制御する(I2C)

ISL229034

Datasheet

Datasheet

Slave Address

Slave address	???

PowerOn

項目	アドレス	Bit7	Bit6	Bit5	Bit4	Bit3	Bit2	Bit1	Bit0
COMMAND-I	0x00	OP7	OP6	OP5	RESERVED	RESERVED	RESERVED	RESERVED	RESERVED

OP7 Bit7	OP6 Bit6	OP5 Bit5	概要
0	0	0	Power-down the device (Default)
0	0	1	The device measures ALS only once every integration cycle. This is the lowest operating mode. (Note 11)
0	1	0	IR once
0	1	1	Reserved (DO NOT USE)
1	0	0	Reserved (DO NOT USE)
1	0	1	Measures ALS continuously
1	1	0	Measures IR continuous
1	1	1	Reserved (DO NOT USE)

arduino

#define ISL29034_POWER_DOWN 0b000
#define ISL29034_ALS_ONLY 0b001
#define ISL29034_ALS_CONTINUOSULY 0b101
#define ISL29034_IR_CONTINUOSULY 0b110

#define ISL29034_COMMAIN_I_REG 0x00

void PowerOn()
{
  writeI2c(ISL29034_COMMAIN_I_REG, ISL29034_ALS_CONTINUOSULY);  
}

Configuration

項目	アドレス	Bit7	Bit6	Bit5	Bit4	Bit3	Bit2	Bit1	Bit0
COMMAND-II	0x01	RESERVED	RESERVED	RESERVED	RESERVED	RES1	RES0	RANGE1	RANGE0

RANGE1 Bit1	RANGE0 Bit0	FULL SCALE LUX RANGE
0	0	1,000
0	1	4,000
1	0	16,000
1	1	64,000

RES1 Bit3	RES2 Bit2	NUMBER OF CLOCK CYCLES	n-BIT ADC
0	0	65,536	16
0	1	4,096	12
1	0	256	8
1	1	16	4

arduino

#define ISL29034_LUX_RANGE_1000 0b00
#define ISL29034_LUX_RANGE_4000 0b01
#define ISL29034_LUX_RANGE_16000 0b10
#define ISL29034_LUX_RANGE_64000 0b11

#define ISL29034_CLOCK_65536 0b0000
#define ISL29034_CLOCk_4096 0b0100
#define ISL29034_CLOCK_256 0b1000
#define ISL29034_CLOCK_16 0b1100

#define ISL29034_COMMAIN_II_REG 0x01

void Configuration()
{
  writeI2c(ISL29034_COMMAIN_II_REG, ISL29034_LUX_RANGE_64000|ISL29034_CLOCK_65536);  
}

Ambientの読み取り

arduino

#define ISL29034_DATA 0x02

uint16_t ReadData()
{
  uint16_t ambient;
  uint8_t buffer[2];

  readI2c(ISL29034_DATA, 2, buffer);
  ambient = (((uint16_t)buffer[1])<<8) | (uint16_t)buffer[0];

  return ambient;
}

Lower Interrupt Threshold Registers

ToDo

Upper Interrupt Threshold Registers

ToDo

I2Cのアクセス用コード

Arduino

#define ISL29034_SLAVE_ADDRESS 0x??

// I2Cへの書き込み
void writeI2c(byte register_addr, byte value) {
  Wire.beginTransmission(ISL29034_SLAVE_ADDRESS);  
  Wire.write(register_addr);         
  Wire.write(value);                 
  Wire.endTransmission();        
}

// I2Cへの読み込み
void readI2c(byte register_addr, int num, byte *buf) {
  Wire.beginTransmission(ISL29034_SLAVE_ADDRESS); 
  Wire.write(register_addr);           
  Wire.endTransmission(false);         

  //Wire.beginTransmission(DEVICE_ADDR); 
  Wire.requestFrom(HTS221_SLAVE_ADDRESS, num);  

  int i = 0;
  while (Wire.available())
  {
    buf[i] = Wire.read(); 
    i++;   
  }
  //Wire.endTransmission();         
}