As I am also working on beaglebone <https://beagleboard.org/black> to 
measure 4-20mA sensor output with  Receiver module 
using less power

can anyone help me out with code to interface the 4-20mA current loop 
Receiver with beaglebone please ??

On Thursday, August 18, 2016 at 10:36:14 PM UTC+5:30, drhun...@gmail.com 
> There is a TI reference design for 4-20mA loop interfaces 
> http://www.ti.com/tool/tida-00550. It is designed as a cape.
> Iain
> On Thursday, August 18, 2016 at 4:24:45 PM UTC+1, Graham wrote:
>> If you would think to Google "4-20 mA receiver" you could learn a lot.
>> Peripheral IC's from TI and Maxim that have most everything you need all 
>> ready designed in.
>> Modules you could interface to the BBB, etc.
>> Application notes on how to design receivers, and things to worry about, 
>> common system problems that people have had with this circuit for the last 
>> 50 years.
>> Good luck.
>> ==
>> On Thursday, August 18, 2016 at 10:03:12 AM UTC-5, Przemek Klosowski 
>> wrote:
>>>  On 8/17/2016 5:26 PM, bali...@gmail.com wrote: 
>>>> I am wondering if a beaglebone black can be used to measure industrial 
>>>> 4-20 ma loops?  I see there is an ADC feature, but the voltage range is 
>>>> only to 1.8V.  Is it possible to set it up to work with the standard 24VDC 
>>>> circuitry involved with most 4-20ma loops?
>>>> A 90 ohm resistor carrying 20mA will develop a voltage of 1.8V. This is 
>>> cutting it a little close, so I recommend 68 ohm, which is a more 
>>> standard/easier to find value anyway. So, just terminate your 4-20mA line 
>>> with this resistor, and connect it to the Beaglebone analog input. Of 
>>> course if you're in an industrial environment you need to watch out for 
>>> transients, noise and interference, especially since the Beaglebone inputs 
>>> are famously fragile, so include some serious input protection (e.g. four 
>>> diodes connected as two anti-parallel 2-diode chains, with a filter cap 
>>> across it and maybe some series resistance). Then again, you could follow 
>>> evilwulfie's advice to use a dedicated buffer op-amp.

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