Hello Folks,
First post so be gentle. Hope this is not a repete post too as I tried posting some time ago and got a blank page.
I want to make an Amper hour meter (not a Watt hour meter) to measure coulombs going into an electrolythic process. The voltages involved will be low (below 12 Volts).
The total Amper hours needing to be counted will be large at around 50,000 (100 Amps going for few weeks).
The whole outfit is DC and there is no requirement for to measure reverse current (not a battery charging/discharging application). I can program a PIC16F628 and have an LCD for display. I want nothing fancy but reasonable accuracy is required (a good stable resistor for running current through and measureing Voltage accross I guess). Is there any other method that someon would recomment other than the resistor to measure the currnt. Hall effect sensor?
I have googled and seen some designs using an op amp and a low value stable resistor. Could I not just use the Analogue to digital converter on the PIC and not bother with the Op-Amp.
Any one got any circuits that they would like to share.
Is there any simpler way it can be done so that the PIC is not needed.
I cannot use a KILL-A-Watt (off the shelf) as the power consumed by the system is not a constant in relation to the current going to where I need to measure it.
Thanks,
John
First post so be gentle. Hope this is not a repete post too as I tried posting some time ago and got a blank page.
I want to make an Amper hour meter (not a Watt hour meter) to measure coulombs going into an electrolythic process. The voltages involved will be low (below 12 Volts).
The total Amper hours needing to be counted will be large at around 50,000 (100 Amps going for few weeks).
The whole outfit is DC and there is no requirement for to measure reverse current (not a battery charging/discharging application). I can program a PIC16F628 and have an LCD for display. I want nothing fancy but reasonable accuracy is required (a good stable resistor for running current through and measureing Voltage accross I guess). Is there any other method that someon would recomment other than the resistor to measure the currnt. Hall effect sensor?
I have googled and seen some designs using an op amp and a low value stable resistor. Could I not just use the Analogue to digital converter on the PIC and not bother with the Op-Amp.
Any one got any circuits that they would like to share.
Is there any simpler way it can be done so that the PIC is not needed.
I cannot use a KILL-A-Watt (off the shelf) as the power consumed by the system is not a constant in relation to the current going to where I need to measure it.
Thanks,
John
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