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Description: This is a small voltage and current sense PCB. DC current is determined by measuring a voltage drop across a pair of parallel 1 mOhm shunt resistors, then converted to a final analog voltage output by the TI INA-169. Voltage sense is accomplished by scaling to 3.3V ADC range by a precision resistor divider.
The PCB is supplied without leads or connectors. The pad sizes are large enough to accommodate 12 gauge heavy duty leads (see datasheet) but care must be exercised in soldering. Smaller gauge leads are considerably easier to solder without creating shorts.
Dimensions: 4 x 15 x 19mm
Based on 4 ratings:
If you follow the instructions on the Ardupilot wiki:
It works perfectly. Thanks guys!
The first board that I bought I changed my setup three times, the last time I used a little too much solder and too much heat that I shorted out the ground trace. (you can see the trace in the picture directly under the N in GND where the ground power wire is soldered to the board) By simply adding a jumper from the power lead ground and the instrument ground lead made for an easy fix, thanks to the great documentation that has been made available.
It takes a beating from ham handed soldering and still works flawlessly. I bought two more of these, since this little board will make for one of the cheapest 90A current probes for general multimeter use that I have ever seen.
Even with the heat required to solder the large gauge wires, the pcb lands showed no sign of delaminating. Then correction factors in the example code worked well and verified against test equipment. I will purchase again.