Polar Ir Interface For Rs232 Serial Port
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This is a wonderful evaluation board cooperatively designed by and SparkFun. The Heart Rate Monitor Interface (HRMI) is an intelligent peripheral device that converts the ECG signal from the (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. Applications:. Custom exercise equipment.
Polar Ir Interface For Rs232 Serial Port Connection
Portable heart rate monitoring devices. Bio-feedback devices. Heart beat aware body-worn electronics. To test the Polar Heart Rate Monitor with a computer’s serial terminal, you would just follow the instructions listed in the manual. By following the instructions on page 13 of the manual under the section “Quick Test with Host Computer,” I was able to send and receive data between the Polar Heart Rate and my computer’s serial terminal (with the settings 9600, 8-none-1-none and turning on the local echo).
The green status LED was on when connecting to the sensor. There should already be a solder jumper on SJ1.
The board’s Rx and Tx LEDs blinked momentarily when connected just like a normal FTDI IC. By typing “G1” and providing a carriage return (hit the enter button on your keyboard), I was able to see a response on the serial terminal. This is the command for getting heart rate data as stated on page 23 of the manual.
The output from the known good in tech support is similar to this: 3 118 0 0 0 The value is not always the same. I do not get this to connect to a Polar H3 sensor. The sensor works fine with the watch, the board connects to the computer by USB and responds to commands, but no heart beat is detected.
Above it only says “Compatible with coded and non-coded Polar transmitters including T31, T31C, T61C and Wearlink®”. From some infos on the forum, I now think that the H3 sensor is not compatible because it uses w.i.n.d. A better compatibility guide would be really useful! Am I correct that only sensors using GymLink as described on this page: will work?
Hi, I am evaluating the HRMI to see if it’s usable for me and it would be VERY helpful if you could send me the Max patch you did to read the pulse input. I’m a student at UC Irvine and working on an interactive vibrotactile project with biofeedback. For some reason I can’t figure out how to PM you so I’m responding hereI don’t want to display my email publicly, but if you go to my website there’s a contact page, and once we have each other’s email then we can exchange files. Hi, I had exactly the same problem: how could it be that I cannot track the LED that I’m seeing so synchronized with the heart pulse?? After a couple of hours testing I fortunately got the solution, or at least a work around: 1 - set the raw mode: S+0+CR (ascii commands) 2 - get the heart rate data: G+1+CR (id.) as fast as possible (every 60ms is fine for me) 3 - then you get 3 values from the hrmi: status byte, count and heart rate. Count is the key value, since it count pulses and changes every time a new pulse arrive; if you read the heart rate data fast enough, then you’ll get a new count value every time the pulse ticks. After that everything is a software matter.
I used Max/Msp to read the data and in the same software I can convert this changing of count values into impulses that, in my case, trigger a sound. I hope this can help you. I have some serious bones to pick with this Dev board. The biggest snafu is that the HR (Heart Rate) pin from the RMCM01 (Polar receiver) is not broken out anywhere on the board! Duh, this is why I bought the board.
Second, why is the PIC16F913 code protected? Anyone who buys this board to experiment with, might want to reflash it to stock form.
The students in my Embedded class have to totally jury-rig the board to make it work on their project. Totally uncalled for on a development board. That said, the RMCM01 works well with every heart rate strap that I own. The firmware on the PIC works well and is reasonably well documented.