PT1000 USB Temperature sensor


PT1000 USB Temperature sensor

Here we brag about or USB PT1000 temperature sensor. The board was build in-house(notice the bodge wires) and uses an STM32F0 with integrated USB peripheral to talk to an android phone and report the sensed temperature.
This build measures the resistance of the sensor using a Wheatstone bridge(back of the board). In order to get accurate readings using the bridge we had to calibrate it using our DR1000 decade resistor box in place of the PT1000 simulating a few datapoints and then we fit the resulting curve to a 3rd order polynomial. The end result is quite satisfying and reliable – as long as the PT1000 datasheet doesn’t lie too much. For reference this is the RTD we used: PT1000

This is part of a larger concept that all our devices should have USB connectivity(especially sensors).

Some pictures of the device:


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