PixArt / Mbed 2 deprecated PixArt_PAH8011_HeartRate_NUCLEO-L476RG

PAH8011 HeartRate on STM NUCLEO-L476RG

Dependencies:   mbed pixart_heart_rate_demo pixart_heart_rate_lib_keil_m4

Fork of PixArt_PAH8011_HeartRate_NUCLEO-L476RG by PixArt Imaging

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Table of Contents

  1. Setup
  2. Hardware:
  3. Connection:
  4. Supplying Power
  5. Functional Test

This section highlights the setup and operating guide to integrating PAH8011 with the Nucleo L476RG.

Setup

Hardware:

  • 1. PC with Windows Operating System
  • 2. Nucleo L476RG Dev Kit Board from Nordic
  • 3. PAH8011 Arduino Enabled Board
  • 4. USB Cable

Connection:

Please connect the board as show below.

/media/uploads/pixus_mbed/connection_without_power_st_nucleo.jpg

Supplying Power

Connect the one end of the USB to the PC USB and the other to the Nordic micro USB as shown in the figure below.

/media/uploads/pixus_mbed/connection_with_power_st_nucleo_unprogrammed.jpg

I am assuming that you already know and are able to download the code at this point.

Do remember to reset the Nordic Board after downloading the code on the Nordic device by pushing on the button illustrated below.

/media/uploads/pixus_mbed/resetting_nordic.png

Next, we will test to see if the sensor is indeed functional and deriving the Heart Rate.

Functional Test

1. Open up Tera Term. If you do not have Tera Term, you can download here.

https://en.osdn.jp/projects/ttssh2/releases/

2. Once you have your Tera Term open, go to File > New Connection or use the Hot Key "Alt + N".

3. Select "Serial".

4. On the Port selection, click on the drop down menu and select the port that describes "JLINK CDC UART Port".

/media/uploads/pixus_mbed/terra_terminal_port_selection.jpg

5. Click on "OK"

6. Place finger gently on the PAH8005 as illustrated below. Remember that finger does NOT need to press hard onto the sensor package in order to derive a heart rate.

/media/uploads/pixus_mbed/finger_on_pah8005.jpg

7. Going back to the Tera Term window, you should see that it is acquiring heart rate when it is writing "Measuring Heart Rate..." and repeating the same message over a 6 to 8 seconds period. This is normal as the algorithm requires certain amount of data to compute the first heart rate. After this startup time, the heart rate measurement should be displayed approx. every second on the Tera Term window.

/media/uploads/pixus_mbed/measuring_heart_rate.jpg

Have fun with this and let us know if you have any further questions!

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