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.
> 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
>>> 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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