Gas gauge calibration unit

I sent the working prototype to 67dart273, for evalutation with real gauges. Since there was no rush, other projects have taken priority. That is OK.

While I used simple and proven means to solve the calibration issues at hand, most did not grasp the solution. The pressing of the calibration buttons, and connection of the 5 wires may escape many possible users. I am not sure if I can write an instruction manual, that everyone can folIow with certainty. I have no interest selling units.

I have provided a schematic above, if you wish to build one, I will send you a programmed chip. I will provide the code free for non profit use. I have no responsibility for the circuit or code, you are at your own risk.