Can you expand the number of channels on a BITalino?

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BITalino
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Posts: 567
Joined: Tue Aug 27, 2013 3:47 pm

Can you expand the number of channels on a BITalino?

Postby BITalino » Sun Sep 08, 2013 5:15 pm

Yes. You can cascade several BITalinos, and use the digital ports to synchronize them.

castros_bro
Posts: 3
Joined: Fri Jun 13, 2014 10:11 am

Re: Can you expand the number of channels on a BITalino?

Postby castros_bro » Tue Apr 04, 2017 4:22 pm

Yes,

I have built a multiplexer which has 16 selectable analogue inputs and one analogue output which goes to one of the Bitalino channels. The 16 inputs to the multiplexer are connected on at a time all controlled by a counter which cycles eg 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,1,2,3,4,5.... etc.
The counter is a 4 bit binary counter so each bit is connected to the 4 bit Bitalino digital input. So if the counter is on count 0011 then the analogue signal on channel 3 is connected to the Bitalino analogue input. Bitalino sampling at 1kHz so each of the 16 analogue inputs needs to have a max frequency of 15Hz or resolution can be lost, with less channels the frequency would be higher but this works with slowly varying analogue such as a bicycle where pedal rotation, gear rotation, brake application, steering input etc. can be recorded along with the other Bitalino channels of ECG + EMG. The processing of the Excel data file is fairly easy to extract the 16 discrete signals.


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