Connect with us

4-20ma signal output based on 12 hour clock

Discussion in 'General Electronics Discussion' started by Bandit DFW, Jul 29, 2017.

Scroll to continue with content
  1. Bandit DFW

    Bandit DFW

    1
    0
    Jul 29, 2017
    I am trying to come up with a circuit that will give out a 4-20 ma signal based on time. The output would be 4ma 12:01 with a linear progression to 12ma at 6:00 and 20ma at 12:00. Has anyone seen a circuit that would do this?
     
  2. kellys_eye

    kellys_eye

    4,276
    1,146
    Jun 25, 2010
    Given the 4-20mA interface usually requires some form of input signal - and that can be 'any' type of signal - it's surely only a means of scaling the input accordingly?

    A stepped ramp with 720 steps (call it 1024 but resetting at 720) could be built feeding an R2R ladder and used as the input perhaps?
     
  3. dorke

    dorke

    2,342
    665
    Jun 20, 2015
    Welcome to EP.

    A uController with a 24 hour timer and a D/A could do the trick.
    It will be an all software project.
    There may be a need to convert the output voltage to current,
     
Ask a Question
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Electronics Point Logo
Continue to site
Quote of the day

-