WillLuce
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Joined: Tue Apr 14, 2015 2:25 am

Advanced ADC Board for Pi

Tue Apr 14, 2015 2:28 am

I'm a CS student and I've taken on a project of building some instruments for data aggregation. I'd like to use the PI since it has an operating system, but after taking a look at the specs of the ADC board currently in use on these projects, I'm not sure the PI has equivalent add-ons. Can anyone give me some tips on where to look for something like what's below?

http://www.diamondsystems.com/products/dmm32dx
http://www.diamondsystems.com/products/onyxmm

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joan
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Location: UK

Re: Advanced ADC Board for Pi

Tue Apr 14, 2015 8:02 am

That looks like a serious bit of kit. Perhaps more suited to use by an electronics/electrical engineer rather than a computer studies (CS?) student.

Do you actually need to use something so sophisticated?

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mikronauts
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Re: Advanced ADC Board for Pi

Tue Apr 14, 2015 2:41 pm

What precision do you need?

If 12 bits, 0-4.096V, 1mV/bit, +-1bit accuracy (generally, worst case a bit worse)
or 12 bits, 0-8.192V, 2mV/bit, +-1bit accuracy (generally, worst case a bit worse)

will suffice for your needs, see

http://www.mikronauts.com/raspberry-pi/ ... and-howto/
WillLuce wrote:I'm a CS student and I've taken on a project of building some instruments for data aggregation. I'd like to use the PI since it has an operating system, but after taking a look at the specs of the ADC board currently in use on these projects, I'm not sure the PI has equivalent add-ons. Can anyone give me some tips on where to look for something like what's below?

http://www.diamondsystems.com/products/dmm32dx
http://www.diamondsystems.com/products/onyxmm
http://Mikronauts.com - home of EZasPi, RoboPi, Pi Rtc Dio and Pi Jumper @Mikronauts on Twitter
Advanced Robotics, I/O expansion and prototyping boards for the Raspberry Pi

techpaul
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Location: Reading, UK
Contact: Website

Re: Advanced ADC Board for Pi

Wed Apr 22, 2015 9:39 pm

The first things to ascertain are

1/ How many analog inputs you require and the voltage or current ranges on ALL inputs

2/ The fastest and slowest rate you need to acquire samples on ALL inputs

3/ To what resolution and accuracy you require for each input

4/ do you need additional analog outputs, again what levels, how many, how fast, how accurate

5/ What digital inputs and outputs you require, again what levels, how many, how fast, how accurate

6/ do you need any other inputs and outputs like serial, PWM timing capture etc.

Then you can work out what you actually need, there is NO such thing as an analog module that will work for all situations.
Just another techie on the net - For GPIO boards see http:///www.facebook.com/pcservicesreading
or http://www.pcserviceselectronics.co.uk/pi/

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Douglas6
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Location: Chicago, IL

Re: Advanced ADC Board for Pi

Thu Apr 23, 2015 12:22 am

Yikes. My rule of thumb: If I have to ask how much it costs (and sign up to do so), then I can't afford it.

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cyrano
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Location: Belgium

Re: Advanced ADC Board for Pi

Thu Apr 23, 2015 6:49 am

In the absence of specs and budget, have a look here:

http://www.axiris.eu/en/index.php/i-o-cards/abiocard

They have an ever changing range of cards for the Pi and used to have an 8-channel 12 bit AD for 30 €. It"s been integrated in other cards, or they might be developing a B+/Pi2B version.

There are a couple of suppliers in Germany too. A bit higher end.

techpaul
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Location: Reading, UK
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Re: Advanced ADC Board for Pi

Thu Apr 23, 2015 8:33 am

Douglas6 wrote:Yikes. My rule of thumb: If I have to ask how much it costs (and sign up to do so), then I can't afford it.
If you just doing hobby project then fine.

In the original posters case it is a University Project and the first card he linked to was a 32 channel 16 bit @ 250Khz (probably for all channels combined) PC104 card, FIFO for data collection accuracy and Programmable Gain amplifier to chnage the ranges on the fly down to +/- 0.625V. Note the input ranges are BIPOLAR as in for negative and positive volatages standard for industrial usage ADCs

4 x D/A outpts 12 or 16 bit, on board FIFOs for data collection accuracy and output waveform pattern at upto 100kHz

Analog inputs and outputs max range is INDUSTRIAL range +/-10V

There are 24 Digitla I/O plus another 4 for Triggers, assumed to be 5V TTL levels.

A counter output assumed 5V TTL levels

RS232 or RS485 Serial port.

Whole board is designed for automotive industry using PC104 (the old PC ISA 16 bit bus) and temperature range of -40 to +85 deg C

Very reminiscent of the ISA 8 and 16 bit bus cards I used to support during the late 1980's and early 1990's

So without specs it is pointless suggesting any cards my basic questions still stand.
Just another techie on the net - For GPIO boards see http:///www.facebook.com/pcservicesreading
or http://www.pcserviceselectronics.co.uk/pi/

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