I'm interested in biofeedback. And it saddens me that ecg sensors aren't out there for people who aren't electrical engineers (or with equivalent non-formal kno

I'm interested in biofeedback. And it saddens me that ecg sensors aren't out there for people who aren't electrical engineers (or with equivalent non-formal knowledge in this topic). Neurosky reportedly has one in the works (but probably also 50-100$). The problem with most heartbeat sensors is that they only give you a frequency. They don't tell you when the heartbeats arrive, or, god forbit, anything interesting about the actual signal.