USB Resistors

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USB Controlled Resistors

The other day I was doing a design for a board which had multiple thermistor inputs and controlled some heaters (like 3D-printers) based on the thermistor inputs.  I wanted to run some tests of my control algorithm and realized I needed some programmable resistors which I could control from a PC. Hence the USB programmable resistor board was born.  

This board has 5 digital resistors from 0-100k  using the AD5272 (1024 steps with around 1% tolerance) which are control through the USB interface (as serial com port). 

This board makes a great way to test thermistors inputs or add variable gain control to an op-amp. 

Note the digital resistor inputs are limited to 0-3.3V. 


Firmware, schematics and example host python code are coming....