Messages

1

PoKeys / Re: Using pokeys56e a2d to measure voltages - accuracy and protection

« on: November 02, 2012, 04:47:39 AM »

OK, thanks, that's just the sort of advice/information I was after.

2

PoKeys / Can the Pokeys PWM outputs be used to emulate a DAC?

« on: November 01, 2012, 01:56:47 PM »

The subject says it all really.

Will the PWM outputs, with a suitable series resistance and load (with a capacitor to provide smoothing) give me the equivalent of a DAC output?  I just want an easy way to drive a 200mV digital meter to use it to display a value generated by my pokeys56e.

Further to that can I read an A2D input and feed the result out to one of the PWM outputs using the supplied software?

3

PoKeys / Using pokeys56e a2d to measure voltages - accuracy and protection

« on: October 31, 2012, 05:52:10 PM »

I have just bought a pokeys56e to do some monitoring jobs on our small boat.

Specifically I am going to use it to measure some battery voltages.

Does anyone know how accurate the voltage reference on the pokeys56 is?  I don't need absolute accuracy as I can of course calibrate the measurement myself (and will have to use a voltage divider anyway as I'm measuring more than 3.3 volts) but I do need the voltage reference to be stable within 1% or so.

Secondly what sort of protection should I provide for the inputs, is there a standard way to do it.  The boat electrical environment is fairly noisy (essentially much like a car).