SEN0097

    Light Sensor (SKU:SEN0097)   Editing Light Sensor Contents    1 Introduction 1.1 Specification 2 Wiring Diagram 3 Sample Code Introduction This is a BH1750 light intensity sensor breakout board with a 16 bit AD converter built-in which can directly output a digital signal, there is no need for complicated calculations. This is a more acurate and easier to use version of the simple foto resistor which only outputs a voltage that needs to be calculated in order to obtain meaningful data. With the BH1750 Light Sensor intensity can be directly measured by the luxmeter, without needing to make calculations. The data which is output by this sensor is directly output in Lux (Lx). When objects which are lighted in homogeneous get the 1 lx luminous flux in one square meter ,their light intensity is 1lx. Sometimes to take good advantage of the illuminant, you can add a reflector to the illuminant.So that there will be more luminous flux in some directions and it can increase the ilumination of the target surface. For example: Night: 0.001--0.02; moonlightnight:0.02--0.3; cloudy indoor:5--50; cloudy outdoor:50--500; Sunny indoor:100--1000; under the sunlight in summer afternoon: about 10*6 power; reading books for intensity of illumination:50--60; home video standard intensity of illumination:1400. Specification power supply voltage: +3 to 5Vdc Interface: I2C Wide range and High resolution. ( 1 - 65535 lx ) It is possible to select 2 types of I2C slave-address. Small measurement variation (+/- 20%) Size: 0.85*0.63*0.13"(21*16*3.3mm) Wiring Diagram Light Sensor Wiring diagram Please note that the "add" Pin is to assign a different I2C address to the sensor. For our sample code this pin is not used. For more information about I2C protocol, go to Wikipedia I2C Sample Code /* Sample code for the BH1750 Light sensor Version 0.1 website:www.DFRobot.com Connection: VCC-5v GND-GND SCL-SCL(analog pin 5) SDA-SDA(analog pin 4) ADD-NC */ #include //BH1750 IIC Mode #include int BH1750address = 0x23; //setting i2c address byte buff[2]; void setup() { Wire.begin(); Serial.begin(57600);//init Serail band rate } void loop() { int i; uint16_t val=0; BH1750_Init(BH1750address); delay(200); if(2==BH1750_Read(BH1750address)) { val=((buff[0]