I have 6' of 24 gauge wire that will be carrying my voltage signal to the PIC's ADC - should I use a 1uf capacitor on the ADC input pin close to the chip?
I have 6' of 24 gauge wire that will be carrying my voltage signal to the PIC's ADC - should I use a 1uf capacitor on the ADC input pin close to the chip?
hi,
I would add a 1K in series with the 6ft lead, close to the PIC's input pin.
I dont know what common/ground/0V line for the Vsource is from the remote [6ft end], but it would be advisable to use at least a twisted pair of wires.
Thats the Vsignal and PIC 0V.
If the 6ft wire is running close to other high current switching lines, I would consider a 5.1V or 5.6V zener from the PIC adc pin to 0V.
hi,
I would add a 1K in series with the 6ft lead, close to the PIC's input pin.
I dont know what common/ground/0V line for the Vsource is from the remote [6ft end], but it would be advisable to use at least a twisted pair of wires.
Thats the Vsignal and PIC 0V.
If the 6ft wire is running close to other high current switching lines, I would consider a 5.1V or 5.6V zener from the PIC adc pin to 0V.
hi,
The PIC internal diodes are limited to about 20mA, I was concerned if the 6ft line picked up a low impedance source 'spike' the 5.1V zener would help to absorb the overvoltage current.
hi,
The PIC internal diodes are limited to about 20mA, I was concerned if the 6ft line picked up a low impedance source 'spike' the 5.1V zener would help to absorb the overvoltage current.
So there's no reason to use a small cap on that ADC line right before the input pin? The reason I ask is that it's done on the supply voltage due to the distance between the Power Supply and PIC.
On a slightly different note, can you recommend a cap size that would reduce the flucuations that I am getting? The ADC readings are on a motorcycle from a voltage dividing circuit. Currently, I'm using a 100uf, but that was just a stab in the dark.