respiration sensor

Connection, ECG, EMG, EDA, etc.
zilog
Posts: 1
Joined: Wed Mar 04, 2015 12:17 am

respiration sensor

Postby zilog » Wed Mar 04, 2015 3:31 pm

Hi,

I just got my bitalino plugged kit and I am loving it. Thanks a lot!

I would like to add a respiration sensor using stretch fabric, I understand that these types of fabric work as resistors, how could I interface such a thing to the BITalino? Any help will be most welcome.

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

Re: respiration sensor

Postby BITalino » Wed Mar 04, 2015 4:20 pm

Hi there,

Awesome idea... do keep us posted on how it progresses ;)

The easiest way is to use a voltage divider, as you can see in the following example for a Force Sensitive Resistor (FSR) sensor; the principle should be roughly the same:
https://www.sparkfun.com/tutorials/269

Another relatively simple option would be to use a Wheatstone bridge setup:
http://en.wikipedia.org/wiki/Wheatstone_bridge

If you have the chance to play around with a little bit more fancy electronics, the ideal would be to use an op-amp and have the output signal covering the dynamic range of the ADC.

Here are a few links to get you started:
http://electrotap.com/2004/11/01/op-amps-part-1-scaling-sensor-voltages/
http://www.instructables.com/answers/How-to-use-an-op-amp/

Needless to say that, although in most of the tutorials you'll find a reference to 5V operating voltage (Arduino UNO world), when designing your circuit and choosing your parts note that the operating voltage to consider is 3.3V, and that your sensor, in principle, should be directly powered from BITalino.

Best regards,
The BITalino Team

TA-TSC
Posts: 8
Joined: Wed Aug 10, 2016 11:12 am

Re: respiration sensor

Postby TA-TSC » Thu Aug 11, 2016 8:14 am

I hope no one minds if I hijack this thread, I didn't want to start another thread asking something similar. I too have bought the plugged kit along with the respiration sensor from the store which came with the UC-E6. Based on what you've posted, it seems like I can't use the respiration with the Bitalino, or can I connect it to the ECG/one of the other chips?

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

Re: respiration sensor

Postby BITalino » Thu Aug 11, 2016 9:13 am

Hi there,

The respiration sensor has indeed been designed for seamless operation with our BITalino hardware base.

If you purchased a BITalino Plugged kit and a respiration sensor with UC-E6 plug it should work by simply connecting it to one of the analog inputs.

The analog inputs are marked in the back of the board as Ax (x=1, ..., 6).

If you purchased a BITalino Board kit you can solder a UC-E6 socket to one of the spaces available:
https://store.plux.info/handy-tools/236 ... 22907.html

Another option is to have a respiration sensor with a Molex Sherlock connector and solder a Molex Sherlock socket on the spaces available:
https://store.plux.info/handy-tools/240 ... 22904.html

Best regards,
The BITalino Team


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