Heart Rate Monitor Interface
(photo: Sparkfun)
The Heart Rate Monitor
Interface (HRMI) is an intelligent peripheral device that
converts the ECG signal from Polar Electro Heart Rate Monitor
(HRM) transmitters into easy-to-use heart rate data. It
implements a sophisticated algorithm for computing an
average heart rate even with noisy or intermittent data
from the transmitter.
The HRMI was born from the Heart Rate
Telemetry system I designed. I wanted to do
something with the algorithm I had designed for that
product and pitched this product to Nathan
Seidle, Sparkfun CEO. He agreed with a handshake and
went off to layout the board for Sparkfun’s
manufacturing process. They build the board and I
provided the firmware, documentation and demo code.
Features
- Multiple interfaces: USB, Logic-level serial and I2C
- Dual heart rate processing algorithms: averaged and raw
- Uses the RMCM01 Polar OEM receiver
- Compatible with coded and non-coded Polar transmitters including T31, T31C, T61C and Wearlink®
- 32-entry heart rate data history buffer
- Four 8-bit ADC inputs
- Up to a 5 channel digital input/output utility port
- Simple command/response interface
- Programmable power-on default operation
- Custom exercise equipment
- Portable heart rate monitoring devices
- Bio-feedback devices
- Heart beat aware body-worn electronics