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Temperature = (double) (((dataH & 0x007F) << 8) + dataL) // Create a 16-bit variable consisting of two one-byte variables I2c_rep_start (address + I2C_READ) // Restart I2C communication at the read addressĭataL = i2c_readAck () // Read the first byte of dataĭataH = i2c_readAck () // Read the second byte of dataĮrc = i2c_readNak () // Read the third (unimportant) data byte I2c_write (0x07) // Write the value 0x07 (select the register Tobj1) I2c_start_wait (address + I2C_WRITE) // Start I2C communication in write mode Lcd.begin (16, 2) // Initialize the display I2c_init () // Initialization of the I2C bus Int dataH = 0 // The second byte of dataĭouble tempnalsb = 0.02 // Variable by which the digital value will be multipliedĭouble temperature = 0 // Variable holding the temperature Int erc = 0 // Variable holding the PEC value Int address = 0xb4 // Sensor address MLX90614 * Support for the MLX90614 sensor on the I2C bus * Non-contact Thermometer with GY - 906 module Now that we understand how the sensor works, let’s dive into the project! Required Materials

This means that it will give an output with a high resolution of 0.02Â☌ and can continuously transfer the measured temperature in the range of -20 to 120Â☌. The best part about the MLX90614 is it comes calibrated with a digital SMBus from the factory. It enables high accuracy and resolution for the thermometer. MLX90614 is a powerful infrared sensing device with a very low noise amplifier and a 17-bit ADC. The MLX90614 thermometer sensor works using this principle. By detecting the IR rays, we can perceive the temperature range. How an Infrared Thermometer WorksĪlthough not visible to the human eye, all objects emit infrared light rays and the concentration varies depending on temperature.

The MLX90614 sensor uses non-contact temperature sensing to collect the temperature info without touching any particular surface. As such, we will use the MLX90614 infrared thermometer from Melexis for this project.

If you want to detect the temperature in the non-contact method (which we do for this project), an infrared thermometer sensor is the best solution. However, for extremely hot scenarios (such as an open flame) you can’t use contact-based sensors to detect accurate temperature. The LM35 or DS18B20 temperature sensors give an output depending on the heat applied directly to the surface of the sensor device. There are many different types of sensors available to measure temperature.