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Ciruit idea and help

Discussion in 'General Electronics Discussion' started by sid2286, Feb 15, 2012.

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  1. sid2286

    sid2286

    102
    1
    Aug 24, 2011
    Dear All,

    I have a sensor, which give me certain analog input, i display this input on a scale of 0-100 on LCD. it reads 100 for full scale input. this section is working perfectly fine.

    Now further, i also need a repeater 4-20mA (0->4mA and 100->20mA) output so using a circuit according to this below link
    https://www.electronicspoint.com/4-20ma-5v-3v-t241190.html
    I was successfully able to implement the repeater output part as well.

    so its perfectly working fine in ideal case(when Sensor is not poison).

    But, now i want to built a circuit wherein as the sensor starts to lose its sensitivity, i want to re-calibrate it(using keypads). the display section is working fine(after re-caribration)
    but i cannot do the same with the repeater output. i have to use the zero and span pot for it.
    I want to avoid these two trimpots after initial calibration and do it through program.

    I'm using a pic-18f4520 for the same and CCS complier.

    Please do suggest.
    Regards,
    Sid
     
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