Hi all,
I recently spotted a wireless heart rate monitor at a local store for just over £10.00- I'd been wanting one to mess about with for a while now.
Will something like this be able to pick up the wireless signal being sent from the chest strap?
Or will I have to tap directly into the watch?
Does the heart rate monitor documentation say what frequency it uses?
You need to know the details of modulation, not just frequency - it might be something simple like GFSK or OOK, but it might be frequency-hopping or spread-spectrum. Even if its a simple modulation scheme you need to know baud rate, encoding, and possibly have to deal with encryption or whitening.
The nRF24L01 module is limited to just two baud rates, BTW, so its unlikely to be useful. Its also obsolete, the nRF24L01+ has 3 baud rates (!)
Unfortunately not. Manual is here: Redirect Notice
It's a cheap unit, so I doubt it bothers with encryption.
Ideally, I'd like to have a 2.4GHz module for the Arduino, but as a last resort I can try tapping into the circuit board.
What are the chances that it'd work with the nRF24L01+ straight off the bat?
Since the owner's manual gives no technical information beyond what size battery it takes it's very hard to say what frequency range is uses. Perhaps if you open the watch there will be a chip with an ID number you can look up.