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    AO Extension - right values

    UniPi 1Wire Extension Modules (official)
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    • C
      CKB last edited by CKB

      Hi, can anyone give me a hint how to control the AO Add-on? I mean, what uint value means +10V at the OUT, what uint value gives 0V at the OUT? right now it feels like jeopardy ^^ ..e.g. if I set the channel to uint=10000, I get 4.4V at the OUT. channel transformation is identity, power supply with 5V and 24V for AO

      thanks in advance

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      • T
        TomasKnot last edited by

        Which addon is it specifically? Is it the I2C addon from this topic?

        https://forum.unipi.technology/topic/258/ao-out-extension-board

        Apologies for the late reply. I think the input should be 12V instead of 24 though, but if you could take a photo of the device it would be very helpful.

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        • C
          CKB last edited by

          Yes, it’s the old AO add on shown in the picture.
          I found out that I can adjust the output voltage from 0-10V with an uint from 0....4095. If I put it 4096 it jumps back to 0V.
          Can you confirm ?

          Also is it allowed to apply 24V as supply or will it damage the unit?

          Right now I am facing the problem of noise injection into the cable at the analog out. Even though I use a PIMPF Cat7 cable (approx 2m long) at the AO, parallel running cables inject a voltage around 0.5...0.6V. I have a LED power supply connected which can be dimmed and which switches on/off at 0.6V and now the LEDs are blinking^^.
          Any idea how to improve ? (I know.. I shouldn’t lay the cat7 along with power cables, but I didn’t expect so huge effects. However, I will try to find an alternative route :) )

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          • C
            CKB last edited by

            Found out that EMC was not an issue, but the LED power supply. I added a 10k resistor in parallel to the 0-10V input which fixed the 0V problem.
            Only poor thing now is the bad behaviour of Mervis with the AO extension board. I added a ramp for smooth dimm up and down, but it's actually not smooth but rather stepwise:

            0_1526662741568_upload-fba94365-0a89-44d6-90b0-8fbb5326bd3c

            Any idea how to fix? Maybe the problem comes from the transformation "to_uint(real)" ?
            0_1526662837098_upload-a436bee8-a32a-4d6f-a8c3-69adaea46871

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