HRMI- Heart rate interface

September 9, 2009

17Aug – order HRMI

27Aug – T31 Polar transmitter arrived

28Aug – test HRMI with T31 — not working

29Aug – test T31 with Polar watch in Cyclery, TownHall

– interface is receiving the signal from the T31 transmitter

03Sep – question in Lab, no answer

– heart rate interface not sending the data to Ardunio, have probelm with the coding

08Sep – send message to the HRMI designer Dan Gulio and Dana, ask about the HRMI setting.

– get feedback from Dan on the same day, helps a lot

From Dan “Without any jumpers in locations OP1-OP7 the HRMI defaults to the I2C address 127.” “Another thing to look at is if the communication program running on the PC is setup properly. Perhaps the Arduino is outputting serial data but the PC baud rate or something is set incorrectly?”

09Sep – HRMI is reading my heart rate with Arduino

– Result: “…

Request 16 => 1 106 79 80 81 81 80 80 80 82 82 83 83 83 81 78 76 73
Request 17 => 1 107 77 79 80 81 81 80 80 80 82 82 83 83 83 81 78 76 73
Request 18 => 1 108 76 77 79 80 81 81 80 80 80 82 82 83 83 83 81 78 76 73

…”

From Dan “This is the expected output. This demo program commanded the HRMI to output increasing numbers of values from the HR history buffer. The first byte is the STATUS byte, the second byte is the COUNT and the remaining bytes are HR values from the history buffer with the most recent value first.”

HRMI

HRMI

Arduino serial output

Arduino serial output

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