Bonjour à tous,
Voilà j'essaie d'acquérir des données (des températures) à l'aide du capteurs infrarouge MLX90614 (voila le mien : https://fr.aliexpress.com/item/Infrared-Non-Contact-Temperature-Measuring-Sensor-Module-MLX90614-BBA-Sensor/32731508377.html?spm=a2g0s.9042311.0.0.3dd26c376qrrlD).
J'ai utilisé le code trouvé sur ce tuto : http://wiki.wiring.co/wiki/Connecting_Infrared_Thermometer_MLX90614_to_Wiring
/**
* Infrared Thermometer MLX90614
* by Jaime Patarroyo
* based on 'Is it hot? Arduino + MLX90614 IR Thermometer' by bildr.blog
*
* Returns the temperature in Celcius and Fahrenheit from a MLX90614
* Infrared Thermometer, connected to the TWI/I²C pins (on the Wiring v1
* board 0 (SCL) and 1 (SDA) and on Wiring S board 8 (SCL) and 9 (SDA)).
*/
#include <i2cmaster.h>
int deviceAddress = 0x5A<<1; // From MLX906114 datasheet's, 0x5A is
// the default address for I²C communication.
// Shift the address 1 bit right, the
// I²Cmaster library only needs the 7 most
// significant bits for the address.
float celcius = 0; // Variable to hold temperature in Celcius.
float fahrenheit = 0; // Variable to hold temperature in Fahrenheit.
void setup() {
Serial.begin(9600); // Start serial communication at 9600bps.
i2c_init(); // Initialise the i2c bus.
PORTC = (1 << PORTC4) | (1 << PORTC5); // Enable pullups.
}
void loop() {
celcius = temperatureCelcius(deviceAddress); // Read's data from MLX90614
// with the given address,
// transform's it into
// temperature in Celcius and
// store's it in the Celcius
// variable.
fahrenheit = (celcius*1.8) + 32; // Converts celcius into Fahrenheit
// and stores in Fahrenheit variable.
Serial.print("Celcius: "); // Prints both readings in the Serial
Serial.println(celcius); // port.
Serial.print("Fahrenheit: ");
Serial.println(fahrenheit);
delay(1000); // Wait a second before printing again.
}
float temperatureCelcius(int address) {
int dev = address;
int data_low = 0;
int data_high = 0;
int pec = 0;
// Write
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;
// Returns temperature un Celcius.
return celcius;
}
J'utilise une arduino Mega (SDA en A4 et SDL en A5).
Mais rien ne s'affiche quand j'ouvre le moniteur série. Et j'ai bien importer la librairie I2CMaster.
A vrai dire j'ai chercher sur les forum mais aucun code ne marche ... Donc si quelqu'un en sait plus merci de votre aide.
