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Accepting a 4-20 mA signal — Parallax Forums

Accepting a 4-20 mA signal

matt_burrowsmatt_burrows Posts: 6
edited 2004-12-22 23:07 in BASIC Stamp
How would I go about accepting a standard 4-20 mA signal from a seperate micro controler into a BS2?

Comments

  • Jon WilliamsJon Williams Posts: 6,491
    edited 2004-12-22 19:00
    You could use a precision shunt resistor and measure the voltage across it with an ADC.

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    Jon Williams
    Applications Engineer, Parallax
    Dallas Office
  • m_fabio2m_fabio2 Posts: 49
    edited 2004-12-22 19:24
    Same way we do with our PLC"S. Use a resistor, which will produce a 1-5 DC voltage, then use a ADC to convert this to a digitial value.
  • BeanBean Posts: 8,129
    edited 2004-12-22 19:43
    Matt, that would be a 250 ohms 1% resistor.
    Bean.
  • matt_burrowsmatt_burrows Posts: 6
    edited 2004-12-22 23:07
    Thanks guys.
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