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Arduino Code for test Heart Rate 7 Click

Heart Rate 7 Click is the newest module from MikroE which uses VEM8080 photodetector has a wide range spectrum from 300nm - 1000nm.

To control and acquisition data, AFE4404 from TI inc. is adopted. This chip permits control 3 LED channels, and sample heart rate default 100 SPS.  A 22-bit ADC permit collecting very small changed voltage from a PD sensor.

In this example we config Arduino Mega  2650 as below:
Pin 4 for RST
PIN 5 CLK
PIN 6 INT

PIN 20 SDA
PIN 21 SCL

Config registers follow the default of AFE4404 datasheet Page 27 with some minor changes.

1. Config Internal Clock through  AFE_CONTROL2 register
addr.: 0x23
value: 0x104218  // setup all dynamic power to save energy

2. Control LED2 current through AFE_LEDCNTRL register
addr: 0x22
value: 0x000100

3. Read data using PROG_TG_EN signal through AFE_TIA_GAIN register
addr: 0x21
value: 0x000125

Time to start and end of PROG_TG setup through two registers:

AFE_PROG_TG_STC register (start time)
  addr = 0x34
  value = 0x001563;
 AFE_PROG_TG_ENDC register (end time)
  addr = 0x35
  val = 0x00991F;

The time default for pulse response frequency is 40000 pulse/4MHz. = 10 ms.

So our time for reading adc 10ms.

Full Program can download from Github link:

https://github.com/LongNguyen1984/AFE4404-arduino/blob/master/AFE4404_PPGexp.ino


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