Mikroelektronika d.o.o.
Herzfrequenz 10 Click Board
Herzfrequenz 10 Click Board
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Das Heart Rate 10 Click Board™ ist eine kompakte Zusatzplatine, die für Anwendungen zur Herzfrequenzüberwachung geeignet ist. Diese Platine verfügt über den MAX86916, einen integrierten optischen Sensor mit Anwendungen in den Bereichen Biosensorik, Näherung und Farbe von Maxim Integrated. Das Modul umfasst interne LEDs, Fotodetektoren und rauscharme Elektronik mit Umgebungslichtunterdrückungsschaltung und stellt die Kommunikation zum und vom Modul vollständig über eine standardmäßige I2C-kompatible Schnittstelle her. Es arbeitet mit einer Versorgungsspannung von 1,8 V und kann per Software mit einem Standby-Strom von nahezu null abgeschaltet werden, sodass die Stromschienen jederzeit mit Strom versorgt bleiben.
Das Heart Rate 10 Click Board™ eignet sich für Anwendungen zur optischen Pulsoximetrie und Herzfrequenzerkennung.
How Does The Heart Rate 10 Click Board™ Work?
The Heart Rate 10 Click Board™ as its foundation uses the MAX86916, a multipurpose optical sensor with applications in Heart Rate (HR) monitoring and as a medical-grade pulse oximeter from Analog Devices. The MAX86916 integrates four LED drivers and BLUE, GREEN, RED, and INFRARED LEDs. The LED current can be programmed from 0mA to 150mA, and pulse width can be programmed from 70μs to 420μs to allow the algorithm to optimize data acquisition accuracy and power consumption based on use cases. Also, the MAX86916 includes a proximity function to save power and reduce visible light emission when the user's finger is not on the sensor.
The receive path in the MAX86916 is composed of an ambient-light-cancellation (ALC) circuit, a continuous-time sigma-delta ADC, and a proprietary digital filter that rejects slow-changing ambient light including 100Hz/120Hz interference from artificial lights. The ALC is designed to cancel ambient-light-generated photodiode current up to 200μA, allowing the sensor to work in high ambient light conditions. When the ambient light cancellation function reaches its maximum limit, due to overflow from strong ambient light, the output of the ADC is affected, and the Ambient Light Cancellation Overflow interrupt, labelled as INT and routed on the INT pin of the mikroBUS™ socket, is generated to detect this condition.
The MAX86916 does not require a specific Power-Up sequence but requires a supply voltage of 1.8V to work correctly. Therefore, a small regulating LDO is used, the MAX8511 from Analog Devices, providing a 1.8V out of both 5V and 3.3V mikroBUS™ rails.
The Heart Rate 10 Click Board™ communicates with MCU using the standard I2C 2-Wire interface with a maximum clock frequency of up to 400kHz. It is fully adjustable through software registers, and the digital output data is stored in a 32-deep FIFO within the device. Since the sensor for operation requires a power supply of 1.8V, this Click board™ also features the PCA9306 voltage-level translator from Texas Instruments. The I2C interface bus lines are routed to the dual bidirectional voltage-level translator, allowing this Click board™ to work with both 3.3V and 5V MCUs properly.
The Heart Rate 10 Click Board™ can operate with both 3.3V and 5V logic voltage levels selected via the VCC SEL jumper. This way, it is allowed for both 3.3V and 5V capable MCUs to use the I2C communication lines properly. However, the Click board™ comes equipped with a library containing easy-to-use functions and an example code that can be used, as a reference, for further development.
SPECIFICATIONS
| Type | Biometrics,Heart Rate |
| Applications | The Heart Rate 10 Click Board™ can be used for optical pulse oximetry and heart-rate detection applications. |
| On-board modules | MAX86916 - multipurpose optical sensor with applications in Heart Rate (HR) monitoring and as a medical-grade pulse oximeter from Maxim Integrated |
| Key Features | Low power consumption, ultra-low shutdoen current, optical-grade glass for long-term performance, reflective heart rate monitor, medical-grade pulse oximeter, bio-optical sensor platform, and more. |
| Interface | I2C |
| Compatibility | mikroBUS |
| Click board size | S (28.6 x 25.4 mm) |
| Input Voltage | 3.3V or 5V |
PINOUT DIAGRAM
This table shows how the pinout of the Heart Rate 10 Click Board™ corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).
| Notes | Pin |  |
Pin | Notes | |||
|---|---|---|---|---|---|---|---|
| NC | 1 | AN | PWM | 16 | NC | ||
| NC | 2 | RST | INT | 15 | INT | Interrupt | |
| NC | 3 | CS | RX | 14 | NC | ||
| NC | 4 | SCK | TX | 13 | NC | ||
| NC | 5 | MISO | SCL | 12 | SCL | I2C Clock | |
| NC | 6 | MOSI | SDA | 11 | SDA | I2C Data | |
| Power Supply | 3.3V | 7 | 3.3V | 5V | 10 | 5V | Power Supply |
| Ground | GND | 8 | GND | GND | 9 | GND | Ground |
ONBOARD SETTINGS AND INDICATORS
| Label | Name | Default | Description |
|---|---|---|---|
| LD1 | PWR | - | Power LED Indicator |
| JP1 | VCC SEL | Left | Logic Level Voltage Selection 3V3/5V: Left position 3V3, Right position 5V |
HEART RATE 10 CLICK ELECTRICAL SPECIFICATIONS
| Description | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage | 3.3 | - | 5 | V |
| IR LED Wavelenght | 930 | - | 950 | nm |
| RED LED Wavelenght | 655 | - | 663 | nm |
| GREEN LED Wavelenght | 520 | - | 535 | nm |
| BLUE LED Wavelenght | 455 | - | 466 | nm |
| Operating Temperature Range | -40 | +25 | +85 | °C |
Software Support
We provide a library for the Heart Rate 10 Click Board™ as well as a demo application (example), developed using MikroElektronika compilers. The demo can run on all the main MikroElektronika development boards.
The package can be downloaded/installed directly from NECTO Studio The package Manager (recommended), downloaded from our LibStock™ or found on MikroE Github account.
Library Description
This library contains API for the Heart Rate 10 Click Board™ driver.
Key Functions
heartrate10_cfg_setup- Config Object Initialization function.heartrate10_init- Initialization function.heartrate10_default_cfg- Click Default Configuration function.
Example Description
This example showcases ability for device to read Heart Rate with 4 different diodes. There is IR, Red, Green and Blue. You can control every one of them individually, and change theirs sequence in FIFO register. All LED data is read from FIFO register, it's 19bit data for every led.
The demo application is composed of two sections :
void application_task ( void )
{
uint8_t rd_dat = 0;
heartrate10_generic_read( &heartrate10, HEARTRATE10_REG_INT_STATUS, &rd_dat );
if ( ( rd_dat & 0x40 ) )
{
uint32_t ir, red, green, blue = 0;
heartrate10_read_complete_fifo_data( &heartrate10, &ir, &red, &green, &blue );
log_printf( &logger, "%lu,%lu,%lu,%lurn", ir, red, green, blue );
}
Delay_ms( 3 );
}
The full application code, and ready to use projects can be installed directly from NECTO Studio The package Manager (recommended), downloaded from our LibStock™ or found on MikroE Github account.
Other mikroE Libraries used in the example:
- MikroSDK.Board
- MikroSDK.Log
- Click.HeartRate10
Additional Notes and Information
Depending on the development board you are using, you may need a USB UART click, USB UART 2 click or RS232 click to connect to your PC, for development systems with no UART to USB interface available on the board. The terminal available in all MikroElektronika compilers, or any other terminal application of your choice, can be used to read the message.
MIKROSDK
The Heart Rate 10 Click Board™ is supported with mikroSDK - MikroElektronika Software Development Kit. To ensure proper operation of mikroSDK compliant Click board™ demo applications, mikroSDK should be downloaded from the LibStock and installed for the compiler you are using.
Herzfrequenz 10 Click Board
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