Beer. As Homer Simpson said, “Beer, the cause of, and solution to, all of lifes problems”
It turns out that making things talk to each other is heaps easier if you don’t crack open the ale first. A few days away and a clear head tonight mean that within 10 minutes, everything is working perfectly.
So perfectly in fact that there’s there imminent risk of feature creep and really only the miniaturisation left to do (which I won’t trivialise because I’m sure I’ll mess up my veroboard layouts a time or two).
Be that as it may, it all works.
My heart rate. This end has a Duemilanova with a MAX7219 LED driver powering an 8 LED level meter and a Nordic nRF2401 wireless link. The Nordic chipset receives 9600bps data from another Arduino (the host end, I suppose) equipped with a corresponding Nordic transceiver that reads serial data from a Suunto PC POD and acts as a relay.