Safe & Sound T-Shirt for Monitoring Elderly and Physically Challenged Patients #6 : Breathe and Heat

RE: Safe & Sound T-Shirt for Monitoring Elderly and Physically Challenged Patients #6 : Breathe and Heat

sakthi.1260 — Thu, 13 Apr 2017 12:40:51 GMT

[mention:acaf6a9338de4eef8f6717d5561ed01d:e9ed411860ed4f2ba0265705b8793d05] [mention:4966e6ad97f64dac9ea8919abb220e1d:e9ed411860ed4f2ba0265705b8793d05] [mention:193ac2434c814a24b46635a2210baec1:e9ed411860ed4f2ba0265705b8793d05] [mention:8fb233e8974445138ef0af2b63b49f94:e9ed411860ed4f2ba0265705b8793d05] thanks guys tried all those stuffs still its picking up noise, haven't tried the Low pass filter, will see if it works [View:/resized-image/__size/16x16/__key/commentfiles/f7d226abd59f475c9d224a79e3f0ec07-96879ec3-690f-4584-9041-a3460192a02e/contentimage_5F00_1.png:16:16]

RE: Safe & Sound T-Shirt for Monitoring Elderly and Physically Challenged Patients #6 : Breathe and Heat

mcb1 — Wed, 12 Apr 2017 05:51:58 GMT

First thing I'd try is swap the conductive string and the 10k resistor so that you have the string between the pin and ground.

Mark

RE: Safe & Sound T-Shirt for Monitoring Elderly and Physically Challenged Patients #6 : Breathe and Heat

dougw — Tue, 11 Apr 2017 23:01:15 GMT

It is always good to find the source of the noise to see if it can be eliminated at the source.

move the system closer to anything that might be supplying the noise to see where it gets worse

A second approach is to shield your system from unwanted noise

try shielding various parts of your system by enclosing them in a Faraday metal cage - like aluminum foil
try shielding the sensor with copper braid
try grounding the shields

If these are not feasible the noise looks to be short duration spikes that can easily be filtered out by a simple low-pass filter.

The sensor looks interesting - what is the manufacturer and part number?

RE: Safe & Sound T-Shirt for Monitoring Elderly and Physically Challenged Patients #6 : Breathe and Heat

DAB — Tue, 11 Apr 2017 17:50:36 GMT

I agree with Jan.

I think you might be picking up some EM from lights or other electronics.

I would suggest wrapping the area with aluminum tape or a flexible conductive screening material and grounding that material.

That way, you should isolate your sensor to just signals on the body.

If they still persist, then you will probably need to add some analog or digital filtering.

DAB

RE: Safe & Sound T-Shirt for Monitoring Elderly and Physically Challenged Patients #6 : Breathe and Heat

Jan Cumps — Tue, 11 Apr 2017 17:36:20 GMT

That noise must come from outside and is picked up by the device or the jumper cables. Are you in the neighbourhood of led lights, a switching power supply, a tv, computer, a dimmer?