Warning
I haven't done this myself. Everything is according to theory.
Introduction
There were couples of questions here and there about how an external current sensor can be connected to OMNIBUS F3/F4 Pro Series.
Frankly speaking, using an external current sensor, especially that on a separate PDB, simply invalidates what Pro variants were designed for; simple single board solution. If it is necessary to use the separate PDB with the current sensor, non-Pro variant would provide far more cleaner, easy to build and maintain builds.
However, those of you still want to connect the external current sensor to Pro variants, this blog entry explains how to do it.
Prerequisites
There are couples of prerequisites.
- Understanding of a separate blog entry
Understanding Current Meters to know what you are dealing with.
- Proper skill and tools to perform medium fine soldering.
- An external current sensor with voltage output that swings from 0V to 3.3V in proportion to current flowing.
- An ability to self resolve questions regarding specifications and derivatives of the external current sensor, including current rating, schematics, scale to be used.
Directions
The onboard current meter of Pro variants is identical to the typical application circuit for INA169.
And if you are going to use an external sensor, then you will be having an additional circuit just like it.
You task is to isolate the original sensor block and connect the external sensor block to the point where
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