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SparkFun Polar Heart Rate Monitor Interface

The Heart Rate Monitor Interface (HRMI) is an intelligent peripheral device that converts the ECG signal from the Polar Heart Rate Monitor (HRM) into easy-to-use heart rate data.

Art-Nr 5998523
 Currently unavailable. Delivery date unknown.


  • Currently unavailable. Delivery date unknown.

Information subject to change.

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This is a wonderful evaluation board cooperatively designed by
danjuliodesigns and SparkFun. The Heart Rate Monitor Interface (HRMI)
is an intelligent peripheral device that converts the ECG signal from
the Polar Heart Rate Monitor(HRM) 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.

Note: This product is a collaboration with Dan Julio. A portion of
each sales goes back to them for product support and continued


* 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(R)
* 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
* Only works with one transmitter (HRM) in range


* Custom exercise equipment
* Portable heart rate monitoring devices
* Bio-feedback devices
* Heart beat aware body-worn electronics


* Manual [1]
* Example software [2] (checkout Dan's impressive example
* [3]
* Bildr Tutorial [4]



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General information

Manufacturer SparkFun
Product type Electronics modules
Item number5998523
Manufacturer no.SEN-08661

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Returns and warranty

Warranty 24 month Bring-in
30-day right of return

30-day right of return

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 Currently unavailable. Delivery date unknown.
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SparkFun Polar Heart Rate Monitor Interface SparkFun Polar Heart Rate Monitor Interface