Crowtail- Infrared Temperature Sensor
Description
This Infrared temperature sensor is a non-contact temperature measure model by using the MLX90614,which one is in small size and low cost with measurement resolution of 0.02℃.Thanks to its low noise amplifier,17-bit ADC and powerful DSP unit,a high accuracy and resolution of the thermometer is achieved.
Model: CT0050ITS
Specification
- Work Voltage: 3.3V ~ 5V
- Temperature measure range: -40~125°C
- Measure accuracy: ±0.5°C
- Compatible digital interface
- Dimensions(mm):20.0(L)x20.0(W)x6.8(H)
Application ideas
- Motion sensor
- Thief-guarding System
- Switch
- Body distance check
- Industrial automation
- movement detection
Usage
This demo is going to show you how to read temperature information from this Crowtail- Infrared Temperature Sensor.
1.Hardware Connection
The Infrared Temperature Sensor is connecting to IIC interface of Crowtail - Base Shield.
2.Download I2Cmaster library for Arduino boards with 16MHz XTAL; Unzip and put it in the libraries file of Arduino IDE by the path: ..\arduino-1.0\libraries;
3.Open “MLX90614” example via the path: File -->Examples -->I2Cmaster --> MLX90614.
#include <i2cmaster.h> void setup(){ Serial.begin(9600); Serial.println("Setup..."); i2c_init(); //Initialise the i2c bus PORTC = (1 << PORTC4) | (1 << PORTC5);//enable pullups } void loop(){ int dev = 0x5A<<1; int data_low = 0; int data_high = 0; int pec = 0; i2c_start_wait(dev+I2C_WRITE); i2c_write(0x07); // read i2c_rep_start(dev+I2C_READ); data_low = i2c_readAck(); //Read 1 byte and then send ack data_high = i2c_readAck(); //Read 1 byte and then send ack pec = i2c_readNak(); i2c_stop(); //This converts high and low bytes together and processes temperature, MSB is a error bit and is ignored for temps double tempFactor = 0.02; // 0.02 degrees per LSB (measurement resolution of the MLX90614) double tempData = 0x0000; // zero out the data int frac; // data past the decimal point // This masks off the error bit of the high byte, then moves it left 8 bits and adds the low byte. tempData = (double)(((data_high & 0x007F) << 8) + data_low); tempData = (tempData * tempFactor)-0.01; float celcius = tempData - 273.15; float fahrenheit = (celcius*1.8) + 32; Serial.print("Celcius: "); Serial.println(celcius); Serial.print("Fahrenheit: "); Serial.println(fahrenheit); delay(1000); // wait a second before printing again }
4.Upload it into your Arduino board and open the serial monitor to observe the temperature information of the environment.