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Heart rate 4 click

MIKROE-2510

24 g

Heart rate 4 click carries the MAX30101 high-sensitivity pulse oximeter and heart-rate sensor from Maxim Integrated.

The click is designed to run on either 3.3V or 5V power supply. It communicates with the target MCU over I2C interface, with additional functionality provided by INT pin on the mikroBUS™ line.

More details

$21.00

Quantity Unit Price
5 $19.95
20 $18.90

Heart rate 4 click carries the MAX30101 high-sensitivity pulse oximeter and heart-rate sensor from Maxim Integrated. The click is designed to run on either 3.3V or 5V power supply. It communicates with the target MCU over I2C interface, with additional functionality provided by INT pin on the mikroBUS™ line.

MAX30101 sensor features

The MAX30101 is an integrated pulse oximetry and heart-rate monitor module. It includes internal LEDs, photodetectors, optical elements, and low-noise electronics with ambient light rejection.

The MAX30101 integrates red, green, and IR (infrared) LED drivers to modulate LED pulses for SpO2 and HR measurements. The LED current can be programmed from 0 to 50mA with proper supply voltage.

The device includes a proximity function to save power and reduce visible light emission when the user’s finger is not on the sensor.

The MAX30101 has an on-chip temperature sensor for calibrating the temperature dependence of the SpO2 subsystem. The temperature sensor has an inherent resolution 0.0625°C.

Pulse oximetry or SpO2

Oxygen-saturated blood absorbs light differently than unsaturated blood. Pulse oximeters measure the oxygen saturation in one’s blood. Or to put it more precisely the percentage of hemoglobin molecules in blood that is saturated with oxygen.

In a healthy adult, this readings go from 94% to 100%.

How the sensor works

Since oxygen-saturated blood absorbs more infrared light than red light, and unsaturated blood absorbs more red light than infrared light, the SpO2 readings are calculated by the comparison of the amount of these two types of light.

It is best to use your finger for measurement.

The same sensor as Hexiwear

Did you know that this click carries the same sensor as Hexiwear

When you place your wrist or fingertip over the slit on Hexiwear, the MAX30101 sensor measures the light absorbance of pulsing blood through a photodetector and derives heart-rate info. Current firmware version is able to show rough estimates.

MikroPlot

You can use the MikroPlot visualization tool (Windows) to generate a graph from the data sent from the MCU.

A UART-USB connection is required.

Specifications

Type Biomedical
Applications wearable devices, fitness assistant devices, biomedical devices, etc.
MCU MAX30101 heart-rate sensor
Key Features Pulse oximetry or SpO2, low power consumption, programmable sample rate
Interface I2C,GPIO
Input Voltage 3.3V or 5V
Compatibility mikroBUS
Click board size M (42.9 x 25.4 mm)

Pinout diagram

This table shows how the pinout on Heart rate 4 click corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).

NotesPinMikrobus logo.pngPinNotes
NC 1 AN PWM 16 NC
NC 2 RST INT 15 INT1 Active-Low Interrupt (Open-Drain)
NC 3 CS TX 14 NC
NC 4 SCK RX 13 NC
NC 5 MISO SCL 12 SCL1 2C Clock Input
NC 6 MOSI SDA 11 SDA1 I2C Clock Data, Bidirectional (Open-Drain)
Power supply +3.3V 7 3.3V 5V 10 +5V Power supply
Ground GND 8 GND GND 9 GND Ground

Jumpers and settings

DesignatorNameDefault PositionDefault OptionDescription
J2A VLED LEFT 5V With this jumper we determine the LED diodes supplied with 3.3V or 5V.

Programming

Code examples for Heart rate 4 click, written for MikroElektronika hardware and compilers are available on Libstock.

Code snippet

This code snippet initializes the system and display, initializes the board and sets I2C registers. New data from the sensor is collected in a endless loop, via polling and sent via UART to MikroPlot when we are in active heart rate mode.

01  void main( void )
02   {
03     system_init();
04     display_init();
05     hr4_init();
06     hr4_set_registers();
07 
08     TFT_Set_Font( &HandelGothic_BT21x22_Regular, CL_RED, FO_HORIZONTAL );
09     TFT_Write_Text( "Use MikroPlot Graph Generator", 10, 100 );
10     TFT_Set_Font( &HandelGothic_BT21x22_Regular, CL_BLUE, FO_HORIZONTAL );
11     TFT_Write_Text( "Place Finger On Sensor", 19, 170 );
12 
13     while ( true )
14     {
15       // Clearing the interrupt by reading the Interrupt Status 1
16       if ( hr4_is_new_fifo_data_ready() & 0x1 ) read_f = true;
17 
18       if ( read_f )                          // If INT was emitted
19       {
20          read_f = 0;
21 
22          if ( !start_f )                     // First start
23          {
24             start_f = true;
25             InitTimer1();                    // Initializing Timer 1
26             LOG("STARTrn");                // Sending START command to uPlot
27          }
28 
29          red_sample = hr4_read_red();        // Read RED sensor data
30 
31          LongToStr(miliseconds_counter , txt_milis);
32          LongToStr(red_sample , txt_val);
33          Ltrim(txt_val);
34          Ltrim(txt_milis);
35 
36          // If sample pulse amplitude is under threshold value ( proximity mode )
37          if ( red_sample > 0 && red_sample < 32000 )
38          {
39            stop_f = true;
40            if ( !no_finger_f )
41            {
42              TFT_Rectangle( 19, 170, 310, 200 );
43              TFT_Write_Text( "Place Finger On Sensor", 19, 170 );
44            }
45 
46            no_finger_f = true;
47          }
48 
49          // If finger is detected ( we are in active heart rate mode )
50          else if( red_sample != 0)
51          {
52              stop_f = false;
53 
54              if ( no_finger_f )
55              {
56               TFT_Rectangle( 19, 170, 310, 200 );
57               TFT_Write_Text( "Generating Graph...", 19, 170 );
58              }
59 
60              no_finger_f = false;
61 
62              // Sending data to MikroPlot in format:[pulse_value, milis] via UART
63              LOG(txt_val);
64              LOG(",");
65              LOG(txt_milis);
66              LOG("rn");
67          }
68       }
69     }
70   }

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