[beagleboard] Re: Industrial I/O expansion board (4-20mA, 0-10V, contactor)

[Bruce Schaller]

I have a complete design.  4 channel, optically isolated, and accurate.  I 
need help writing the driver. loop power is totally isolated to protect the 
beagle.  

On Tuesday, July 9, 2013 at 12:10:44 PM UTC-4, khuy...@gmail.com wrote:

 Hi, did anything ever come of this?

 On Thursday, July 22, 2010 1:15:46 AM UTC-4, Yann Ramin wrote:


 I have been working on scratching a personal itch with the BeagleBoard 
 and thought I would make an announcement to see if there are any other 
 people interested or with the same problem. 

 The expansion board (dubbed the Hardhat) is an industrial analog I/O 
 board, for interfacing with various process control pieces of 
 equipment (RTD transmitters, VFDs, etc). Its an all-inclusive board 
 with 4-20mA and 0-10V inputs and outputs (sourcing 4-20mA 
 transmitters), an RS485 half duplex port (for MODBUS) as well as 
 accepting a 24V power input to run the whole thing (BeagleBoard 
 included). 

 I'm busy documenting the design as is and awaiting prototype boards. 
 The design will be under an Open Source Hardware license (likely CC-SA- 
 A). 

 More information can be found here: 

 http://stackfoundry.com/beagle_hardhat/ 



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[beagleboard] Re: PWM input in beaglebone

[Bruce Schaller]

I'm guessing that you figured this out already or don't care any more.  But 
in case you were wondering, you can use the GPIO pins, google around for 
this and there's the interrupt method.  Maybe the easiest if you don't 
mind 10bit resolution would be to use the PWM with an optocoupler, like the 
LED dimming example.  Then you could go right to the analog in pin.  I 
guess it really depends on how fast you need to do it.  10 bit is 1024...so 
that would give you about... 800-20=780; 780/1024 = 0.76kHz per step.

Cheers,
Bruce

On Wednesday, July 4, 2012 12:26:01 PM UTC-4, Jeshwanth wrote:

 Hello All,

 I have a PWM signal which is going to give input to beaglebone, the 
 frequency starts from 20kHz to 800kHz. What is the method I can use to 
 calculate the frequency ?? 


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