Arduino i2c example temperature install#
Install wiringPi sudo apt-get install wiringpiħz x Infrared-Temperature-Sensor-Code.7z -O.The Microchip MCP9808 is a high precision temperature sensor with an I2C interface – making it easy to interface with microcontroller or embedded Linux electronics. configure & sudo make & sudo make check & sudo make install Install libraries BCM2835 libraries wget Open a terminal and run the following commands: So, the value is most correct while the object covers the whole FOV. The temperature detected is the weighted mean of the object temperature detected on FOV. And it is related to the spindle axis of the sensor. The FOV is determined by the 50% radiation signal received by the thermoelectric pile. We read the data of ambient and object temperature according to the timing introduced above, then calculate the ambient temperature and object temperature refers to the datasheet.Ĭelsius degree(☌): ((TempData_H <<8) + TempData_L )*0.02 - 273.15įor a non-contact infrared temperature measuring module, Field of view (FOV) is a very important concept.
Arduino i2c example temperature driver#
Using STM32F code as examples, the driver uses PB8 and PB9 to simulate the timing of SMBus. And use command: 0x00 | 0x07 = 0x07 to access the Object Temperature register. To access the Ambient Temperature register on RAM, the command is: 0x00 | 0x06 = 0x06. Generally, we read temperature value from RAM, needn’t read the EEPROM. With the command form, we can know the operation code that access RAM is 0x00, and 0x20 access the EEPROM.
If we want to write, we need to send (SA<<1) + 1 = 0x01 next.Īccording to the RAM register address form above, the address of the Ambient Temperature register is 0x06, and it is 0x07 of Object Temperature register on RAM. With the Start signal, if we want to read the MLX90614, we need to send (SA<<1) + 0 = 0x00 next.
If there is more than one MLX90614 on the bus, we can change the Slave address on EEPROM. If there is only one MLX90614 sensor, the 7-bits address is 0x00 by default. Then send an 8-bits data which is combined with 7-bits address of Slave and Read/Write operation bit. Master will send a Start signal at the beginning. Active Low.Īccording to the protocol of SMBus and its timing we can know that.
Measuring range (object): -70☌ ~ 380 ☌.Works with 3.3V/5V MCU system directly, thanks to the built-in level translation.Calibrated before delivery, with gradient temperature compensation.Contact-less, high precision, high resolution, fast response.Also measures the average temperature over an area.Measures the surface temperature of an object without touching it, depending on the emitted IR waves of the target.