Thread: (question) Possibility of 5KHz communications?
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juiceme is offline juiceme
2013-10-06 , 17:33
Community Council | Posts: 4,920 | Thanked: 12,867 times | Joined on May 2012 @ Southerrn Finland
#9
Originally Posted by Mric View Post
Hey Juiceme,
Sorry for late reply but I'm very interested to hack this device as it is no use for me rigth now.
I have opened it with a simple knife and it probably killed the sealing but it is good enough to close it back.
Here are some pictures:
Thanks, that really looks pretty neat, you were able to open it up without destroying it (or at least it looks like that!)
I assume that the cylinder-shaped longish black thing is propably a ferrite-core antenna for the transmitter.


Originally Posted by Mric View Post
After some research on internet I found a pretty awesome project:
http://randomcontent.wolfnexus.net/R...e/arduino-hrm/

He is using a RMCM01 chip that reception and filters the signal (5Khz) and outputs a 1 ms pulse at 3V for every heartbeat detected.

Do you think we could simply connect this chip (RMCM01) to a bluetooth emitter and voila ?
As far as I understand the RMCM01 is a self-contained receiver, you would not need to wire anything into the HRM button itself, it receives the wireless signal from it and for output, well, BT could be one valid solution to get the signal to N9.

However, on the project page the author says that the module is no longer available. There are alternatives, for example on page http://www.fact4ward.com/blog/ic-if/rmcm01/ but it seems that those too are not easily obtainable.

Unless there is some solution like that easily obtainable, the alternative is to try to directly interface to the HRM button electronics.

Actually now as I looked into it, the Suunto model HRM's like what I have use different communication protocol called ANT. http://en.wikipedia.org/wiki/ANT_%28network%29