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61 lines
1.5 KiB
C++
61 lines
1.5 KiB
C++
// reads out the MLX90614 infrared thermometer
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#include <Arduino.h>
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#define SDA_PORT PORTD
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#define SDA_PIN 3
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#define SCL_PORT PORTD
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#define SCL_PIN 5
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#include <SoftI2CMaster.h>
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#define DEVICE (0x5A<<1)
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void setup(){
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#if (__AVR_ARCH__ == 5) // means ATMEGA
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Serial.begin(19200);
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Serial.println("Setup...");
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#endif
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i2c_init();
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}
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void loop(){
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int dev = 0x5A<<1;
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int data_low = 0;
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int data_high = 0;
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int pec = 0;
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i2c_start(dev+I2C_WRITE);
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i2c_write(0x07);
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// read
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i2c_rep_start(dev+I2C_READ);
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data_low = i2c_read(false); //Read 1 byte and then send ack
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data_high = i2c_read(false); //Read 1 byte and then send ack
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pec = i2c_read(true);
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i2c_stop();
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//This converts high and low bytes together and processes temperature, MSB is a error bit and is ignored for temps
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double tempFactor = 0.02; // 0.02 degrees per LSB (measurement resolution of the MLX90614)
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double tempData = 0x0000; // zero out the data
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int frac; // data past the decimal point
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// This masks off the error bit of the high byte, then moves it left 8 bits and adds the low byte.
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tempData = (double)(((data_high & 0x007F) << 8) + data_low);
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tempData = (tempData * tempFactor)-0.01;
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float celcius = tempData - 273.15;
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float fahrenheit = (celcius*1.8) + 32;
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#if (__AVR_ARCH__ == 5) // means ATMEGA
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Serial.print("Celcius: ");
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Serial.println(celcius);
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Serial.print("Fahrenheit: ");
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Serial.println(fahrenheit);
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#endif
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delay(1000); // wait a second before printing again
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}
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