โมดูล เซนเซอร์วัดแสง ความสว่าง GY-49 MAX44009 Digital Illumination Light Intensity Sensor Module i2c Interface High precision

โมดูลวัดค่าแสง ความสว่าง ใช้ I2C bus เหมาะกับงานด้าน industrial ด้วยกระแสทำงานเพียงแค่ 1uA ซึ่งเครมว่าต่ำที่สุดในบรรดาตัววัดแสงทั้งหมด ให้ความละเอียดสูง วัดได้ตั้งแต่ 0.045 lux ถึง 188,000 lux 




วิธีการต่อ MAX44009 กับ Arduino UNO

Arduino UNO - MAX44009
5v                 - VCC
GND              - GND
SCL                - A5
SDA               - A4





ตัวอย่าง Code MAX44009 กับ Arduino UNO แบบไม่ใช้ library

#include<Wire.h>

#define Addr 0x4A

void setup()
{

 Wire.begin();
 // Initialise serial communication
 Serial.begin(9600);

 Wire.beginTransmission(Addr);
 Wire.write(0x02);
 Wire.write(0x40);
 Wire.endTransmission();
 delay(300);
}

void loop()
{
 unsigned int data[2];
 Wire.beginTransmission(Addr);
 Wire.write(0x03);
 Wire.endTransmission();

 // Request 2 bytes of data
 Wire.requestFrom(Addr, 2);

 // Read 2 bytes of data luminance msb, luminance lsb
 if (Wire.available() == 2)
 {
   data[0] = Wire.read();
   data[1] = Wire.read();
 }

 // Convert the data to lux
 int exponent = (data[0] & 0xF0) >> 4;
 int mantissa = ((data[0] & 0x0F) << 4) | (data[1] & 0x0F);
 float luminance = pow(2, exponent) * mantissa * 0.045;

 Serial.print("Ambient Light luminance :");
 Serial.print(luminance);
 Serial.println(" lux");
 delay(500);
}

Datasheet MAX44009



Product Description

The MAX44009 ambient light sensor features an I2C digital output that is ideal for a number of portable applications such as smartphones, notebooks, and industrial sensors. At less than 1μA operating current, it is the lowest power ambient light sensor in the industry and features an ultra-wide 22-bit dynamic range from 0.045 lux to 188,000 lux.

Low-light operation allows easy operation in dark-glass applications.

The on-chip photodiode's spectral response is optimized to mimic the human eye's perception of ambient light and incorporates IR and UV blocking capability. The adaptive gain block automatically selects the correct lux range to optimize the counts/lux.

The IC is designed to operate from a 1.7V to 3.6V supply voltage range and consumes only 0.65μA in full operation. It is available in a small, 2mm x 2mm x 0.6mm UTDFN-Opto package.

Wide 0.045 Lux to 188,000 Lux Range

Small, 2mm x 2mm x 0.6mm UTDFN-Opto

VCC = 1.7V to 3.6V

ICC = 0.65μA Operating Current

-40°C to +85°C Temperature Range

Device Address Options

1001 010x and 1001 011x

PCB size:(L*W)1.32*1.05cm/0.52"*0.41"