Description: 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 development.
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In addition to working on humans, the Polar T31 transmitter can be strapped to a cow. We hung this interface on a steel bar about 2 feet from the cow with the transmitter, and it picked up the signal just fine (after we slathered some electrolytic gel on the transmitter). The data was collected by a simple serial program running on Ubuntu which sent a “G” command about once a second. If this pickup can work in a barn, it can pretty much work anywhere.