Re: [PSUBS-MAILIST] Electronic help request

[Jon Wallace <jonw@psubs.org>]

Tried this today with a 12vdc car battery and the drift remains.  I've 
gotten a couple of suggestions to add a capacitor between the supply and 
ground of the power going to the pressure sensor (used 10uF) but that 
didn't help either.

The other really strange thing is that when I remove the power to the 
LM34 temp sensors (leaving the ground attached to the UNO board) the ADC 
pulls "0".  But if I remove the power from the pressure sensor, the ADC 
pulls random numbers just as it does if there is nothing attached to the 
analog input.  I have no clue what that means, its just an observation.



On 10/23/2011 8:27 AM, Jens Laland wrote:
> Jon
>
> You should test your pressure sensor using a standard 9 volt battery, this
> to see if your problem (drift) is caused by the Laptop AC/DC Adapter as
> the 18.72 volt may contain some some high frequency AC pulses.
>
> Best regards,
> Jens Laland




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