4-20ma to XDK connection
Risposta
14/08/19 16.18
Hello, 
I am looking to connect a flow meter to the XDK. I have a 4-20ma signal, but am uncertain how to wire it to the extention board. How do I go about doing this? 

Sorry for the vague question, I have very little electrical experience. 

Thank you!
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RE: 4-20ma to XDK connection
Risposta
15/08/19 8.45 come risposta a Nicholas Lenzi.

Hi Nicholas,

Here is a description for the ADC::
https://developer.bosch.com/web/xdk/analog-to-digital-converter

regards

Saeid

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RE: 4-20ma to XDK connection
Risposta
16/08/19 9.02 come risposta a Saeid Kajlar.
Hi Nicholas,

for a more professional outlook on this topic, I recomend to look for "current loop receiver" in your trusted search engine.

Basically you need to convert the current into voltage in order to get an ADC value. For this take into account that the ADC should use the 2.5V reference. The maximum resistor value to use is 2.5V/20mA = 125 Ohm. The closest E12 resistor value would be 120 Ohm (2.4V at 20mA).

Regards.

Francisco
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