Work In Progress!

Software PID controller

pid can2

Uses a sourcemeter, and a voltmeter to control the temperature of a PCB sealed inside a can and immersed in liquid nitrogen.

pid can2

A diode based temperature sensor is used for measuring, and a voltage regulator was repurposed (misused) as a heating element .  A python script converts the voltage values read from the sensor into temperature via a fitting function based on a look up table provided by the manufacturer. It then decides the the amount of current to send to the heater based on the standard PID equation.

awesomenessStability of around 25mK was achieved

 

 

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