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Mindstorms™ Heart rate monitor

Using a Mindstorms™ RCX Lego™, a chest-strap heart-rate-monitor and an adapted Lego™ light-sensor, you can build your own tool for datalogging and graphing.

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The RCX with a light sensor attached.

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Polar™ chest-strap heart monitor with sensor.

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Modifying the light-sensor

In this process we've adapted a light-sensor to use to power the heart-rate sensor.
* Understand that you will be permanently modifying the light sensor, and that they are not inexpensive.* (but may be a cheaper alternative to manufactured adaptors)

This is the bottom of the light sensor. You'll need to remove the brown plate.(it pries off with a bit of force)

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Here are your soldering points for the three leads (before the removal of the light sensor. Click here for detailed instructions.

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After soldering the three leads.

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Use different colored aligator-leads to attach to the circuit to test it.

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The Vernier receiver for the transmitter, with a serial connector.

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The three leads are then connected to the female serial adapter.

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Here is a diagram of the male serial pinouts.

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The finished test circuit

Using Robolab 2.0, the education version of the RCX software, you can graph the results of your data logging.Use this link to the Robolab project to download the program that will run the heart rate sensor.

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building the monitor |sensor circuit | download program

 

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