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DC METER USING MSP430F427

Intellectual 555 points

Replies: 11

Views: 1854

I want to make a DC meter, which can read DC Voltage and current, with MSP430F427.

Please tell me if it is possible, and if possible please provide details.

Thanks in advance.

11 Replies

  • Hi Suman!

    Yes, in general you can do that with this device. But since it already has NRND-status, I would think about switching to the MSP430F427A device. Anyway - the processor has a built-in 16 bit ADC which can be used for your measurements. Depending on your plans regardning input range and resolution you will need to do some signal conditioning, so first you should think about your desired specifications.

    Dennis


  • In reply to Dennis Eichmann:

    You may want to look at this post:

    It describes a possible input resistor ladder for measuring different voltage levels.

    Dennis


  • In reply to Dennis Eichmann:

    Thanks for help Dennis,
    My input range is between 0 to 100V and resolution needed is of 10mV.
    Previously I have designed volt meter for AC current, but that do not read DC voltage accurately.
    So, I need help in reading DC voltage.
    Please help.
  • Guru 46710 points

    In reply to Dennis Eichmann:

    Dennis, your divider have inherent flaw :) It basically have just 1:10 range unless relays are used.

    Input of ADC or multiplexer CD74HC4051 will act as clamp for 1:10 tap, rendering higher ranges of your circuit useless at voltages exceeding 10*(VCC+V_clamp_diode_drop) volts.
  • In reply to Ilmars:

    , after a second thought about the analog multiplexer connected to the different taps I fully agree to your statement! You're right, the higher voltage taps will be clamped - thanks for pointing this out! I will have to correct that in the other post.

    Dennis


  • In reply to Dennis Eichmann:

    Thanks for help Dennis,
    My input range is between 0 to 100V and resolution needed is of 10mV.
    Previously I have designed volt meter for AC current, but that do not read DC voltage accurately.
    So, I need help in reading DC voltage.
    Please help.

  • In reply to SUMAN BHARTI:

    That is interesting since reading DC voltage is normally easier than AC. What are your thoughts on how to do it so far?


  • In reply to Dennis Eichmann:

    Actually I want to read both AC & DC Voltage & Current Simultaneously, in same meter.
    Please tell me if it is possible.

    My meter reads 6-10 Volt less than actual, when used to measure from UPS. But on Mains it reads correct.
    Please suggest solution.
  • In reply to SUMAN BHARTI:

    Could you show the circuit you have so far?


  • In reply to Dennis Eichmann:

    Please find the Circuit asked for.

    METER.pdf

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