Another Current/Voltage gadget

[Bob Baker]

Nothing too new here, except I found this nice temp compensated 1% current shunt at Digikey for $10 (part number CS3FR001). This is a 4-wire kelvin connected shunt. I have used a calibrated piece of copper wire as a shunt for years, and it works OK, but this just gives me some peace of mind that I'm getting the right numbers.

I have also added a voltage measuring wire and a resistor to the circuit configured so I can measure voltage by switching the meter from the 200mV scale to the 10mA scale; no additional switches are required.

I don't have a whatmeter I don't plan to get one. I figure that a good DVM is a basic requirement, and a current shunt is an easy add-on. And I much prefer the short connections between battery and ESC.

[Miami Mike]

I think your "ma" and "VOLTS" labels are mixed up, or at least it looks like it at first glance.

[Miami Mike]

Now I get it - the "ma" output is for measuring voltage and the "VOLTS" output is for measuring current. You're just showing where they plug into your meter. That's confusing.

[Bob Baker]

Yes, it looks kind of odd; one resistor to convert current to voltage and another to convert voltage to current. But it allows easy switching between current and voltage readings.