In addition to yesterday's project on the application of a water-resistant temperature sensor, I now complete a further description of a test with an infrared temperature sensor, named MLX90614ESF alias GY-906 or D108A08.
I bought this sensor to measure the oven temperature behind the sealed disk. Another area of application would be the milk of the baby bottle or temperature check of a cool blond beer.
After finding the necessary Libary "Adafruit_MLX90614" with help from the great Particle Community, the wiring was a simple matter: after all, the sensor offers I2C communication, which is realized at the Photon via 2 PINs (D0 = SDA + D1 = SCL). Another project, which deals with a BME280 and the issue via an OLE display about I2C, can be found here.
You need to wire 2x 10k Ohm resistors to get realistic values (3V3<>D0 and 3V3<>D1).
The sensor can NOT be used to detect heat or cold bridges at a property: the target object is very close (up to 5 cm) to the sensor. In my experience, I can not sign the only searchable example for me. In the case of the sensor used here with the supplement ESF in the name, I was able to browse through the website of Adafruit and the datasheet available there on the manufacturer's side.
- Factory calibrated
- -40°C to +125°C for sensor temperature
- -70°C to +380°C for object temperature
- ±0.5°C accuracy around room temperatures
- High accuracy of 0.5°C over wide temperature
- 90° Field of view
- 2.7 to 3.6V power
- I2C interface, 0x5A is the fixed 7-bit address
The sketch shows the two values: one for the ambient temperature (temp ambient) and one for the object temperature (temp object), running on the serial monitor and/or as a published value within the Particle Cloud.
A real area of application does not occur to me, which I would trust my 7 Euro sensor; the sensor was already at the breakfast table for excitement provided: the milk to the muesli was just like an ice bag from the ice compartment not cold enough and I led a discussion on whether the coffee surface is measured or the coffee liquid in the cup itself I can not answer to what extent the sensor is measuring into the target object. For this I would have had to take the yesterday's water-proof Dallas sensor into the experiment setup with in order to come to a real correlation of the values.
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