Hello everybody
I want to create my own heartbeat sensor but my problem is that i want it to be implemented in a t-shirt so I can't use the phototransistor-led heart beat sensor.
I have no idea what to use.
anyone here can help me please?
Thank you
When you say heartbeat sensor, do you mean by means of using electrodes on skin to measure electrical activity ?
I don't understand how you would incorporate any such thing in a t-shirt, but would be interesting to know if one day that would be possible.
For direct electrical activity measurements you need a good contact to skin in a number of locations using special electrode pads. Best to search online about this.
What I can say is that you will need good analog skills and to use appropriate instrumentation op-amps to get a reliable signal before bring any such signal into an Arduino for processing.
Also, remember not to use anything that is connected to any form of mains power. If you are going to mess about with this sort of thing, you need to understand the human model in terms of its electrical conductivity and also from a safety point of view.
I did develop many years ago such devices for specialist medical doctors, and I recall there is a bit to it all.
If not designed correctly, you will encounter many problems such as electrical noise.
If you only want a heartbeat sensor, why not use a safe method of LED and photo detector ?
Paul
The two techniques for heartrate sensing that I'm aware of are optical (wrist, finger, earlobe led + photo transistor) and electrodes (chest strap or individual ekg patches). I've seen chest strap style sensors integrated into a sport bra, but you need something that maintains good contact which would be problematic in a typical t-shirt. Chest strap style sensors are available in Bluetooth and a few other RF modes. I expect bluetooth would be the most straightforward wireless link to integrate with Arduino.
I think that the chest strap is a good idea, I can maitain a good contact with the skin
but i want to build my own device
Do you know what is the sensor used in such devices?
Best to go out and buy one of those then and start hacking away :o
Paul
In a country such meine we can't buy something like that
Mz409:
I think that the chest strap is a good idea, I can maitain a good contact with the skin
but i want to build my own device
Do you know what is the sensor used in such devices?
I've used them as a consumer, but never tried to build one. There are circuit examples for ECG amplifiers on the web. That's where I'd start.
I did talk with a Professor in my school he told me he did build one with an Atmel QT1011 touch sensor
But I really can't understand what's the relation between a capacitive sensor and heartbeat pulse ..
It might be cynicism, but the difference between a capacitive sensor and a heart beat pulse is huge, as you can imagine, one is electronics and one is biological.
Maybe what you are wanting to say or ask is what is the difference between a capacitive touch sensor and a typical electrode sensor for measuring heartbeat signals, again a huge difference. Think about what a capacitor is and how it works and compare that to an electrode, a direct connection, that is typically DC coupled, not AC coupled as in a capacitive sensor.
More research is required.
Paul VK7KPA