Re: [EE]: Bi-Directional 20A current shunt Using Single supply OPAMP

Analog Devices also have a range of current sensors, and I think they
inherited some from LT as well. Microchip also have a range inherited from
Supertex. Any of these should be able to scale the output to feed a micro
directly, typically by selecting the output current sink resistor to
produce a voltage scaled to the desired range.




On Fri, 12 Sept 2025 at 08:35, Clint Jay <[email protected]> wrote:

> Is the shunt set in stone or could you consider one of the current sensors
> with built in conditioning like the INA2xx range?
>
> Clint. M0UAW IO83
>
> *No trees were harmed in the sending of this mail. However, a large number
> of electrons were greatly inconvenienced.*
>
>
> On Fri, 12 Sept 2025, 03:46 Justin Richards, <[email protected]>
> wrote:
>
> > I would like to condition the output of a 1.1mV/A current shunt to drive
> > the analog input of a WEMOS D1 Mini (0 - 3.3V).
> >
> > The target application is easy monitoring (wifi) of anything 12V with an
> > Anderson plug. i.e. Vehicle to Caravan charge line, Solar Panel to
> Battery,
> > Battery to Electric Blanket/Fridge etc.
> >
> > The device is to be powered from the circuit it is monitoring which will
> be
> > around 12.8V.
> >
> > I am a long way from a bench so have resorted to LTspice.  The attached
> > circuit (5KB so I hope it gets thru) appears to behave exactly as
> desired.
> >
> > However, 2 diodes in series to raise the reference to allow for the
> > negative swing seems to work in LTspice but I am curious what others
> think
> > about this approach.
> >
> >
> > Justin
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