Mikroelektronika d.o.o.
Oximeter 5 Click-Board
Oximeter 5 Click-Board
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Das Oximeter 5 Click Board™ ist eine kompakte Zusatzplatine, die sich zum Messen der Sauerstoffsättigung im Blut eignet. Diese Platine verfügt über das MAX30102, integrierte Pulsoximetrie und Herzfrequenzüberwachungsmodul von Analog Devices. Das MAX30102 umfasst interne LEDs, Fotodetektoren, optische Elemente und rauscharme Elektronik mit Umgebungslichtunterdrückung. Es arbeitet mit einer einzelnen 1,8-V-Stromversorgung, die von beiden mikroBUS™-Stromschienen für die internen LEDs bezogen wird, und kommuniziert über eine standardmäßige I2C-kompatible Schnittstelle. Das MAX30102 kann per Software mit null Standby-Strom heruntergefahren werden, sodass die Stromschienen jederzeit mit Strom versorgt bleiben. Dieses Click Board™ macht es zu einer ausgezeichneten Wahl für optische Pulsoximetrie und Gesundheitsüberwachungsanwendungen.
Das Oximeter 5 Click Board™ wird von einer mikroSDK-kompatiblen Bibliothek unterstützt, die Funktionen enthält, die die Softwareentwicklung vereinfachen. Dieses Click Board™ wird als vollständig getestetes Produkt geliefert und ist bereit für den Einsatz auf einem System, das mit der mikroBUS™-Buchse ausgestattet ist.
How Does The Oximeter 5 Click Board™ Work?
The Oximeter 5 Click Board™ as its foundation uses the MAX30102, a high-sensitivity pulse oximeter and heart-rate sensor from Maxim Integrated, now part of Analog Devices. The MAX30102 integrates Red and IR LEDs, with 660nm red and 880nm IR wavelengths, to modulate LED pulses for oxygen saturation (SpO2) and heart rate measurements. The LED pulse width can be programmed to allow the algorithm to optimize SpO2 and HR accuracy and power consumption based on use cases.
The SpO2 subsystem of the MAX30102 contains ambient light cancellation (ALC), a continuous-time oversampling sigma-delta ADC with 18-bit resolution, and a proprietary discrete-time filter. The ALC has an internal Track/Hold circuit to cancel ambient light and increase the effective dynamic range. The MAX30102 also has an on-chip temperature sensor with an inherent resolution of 0.0625°C for calibrating the temperature dependence of the SpO2 subsystem.
The MAX30102 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, providing a 1.8V out of both 5V and 3.3V mikroBUS™ power rails. Also, it can be shut down through software with zero st and by current, allowing the power rails to remain powered at all times.
Oximeter 5 Click communicates with MCU using the ST and and I2C 2-Wire interface with a maximum clock frequency of 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 and SN74LVC1T45 voltage-level translators. The I2C interface bus lines are routed to the voltage-level translators allowing this Click board™ to work with both 3.3V and 5V MCUs properly. Also, it uses an interrupt pin, the INT pin of the mikroBUS™ socket, used for when an interrupt occurs, after the power is established, to alert the system that the MAX30102 is ready for operation.
The Oximeter 5 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 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 fur the r development.
SPECIFICATIONS
| Type | Biometrics |
| Applications | The Oximeter 5 Click Board™ be used for optical pulse oximetry and health monitoring applications |
| On-board modules | MAX30102 - high-sensitivity pulse oximeter and heart-rate sensor from Maxim Integrated, now part of Analog Devices |
| Key Features | Integrated optical components, fully integrated ADC, LED drivers, and timing core, low power consumption, fast data output capability, designed for ultralow direct optical reflections, and more |
| Interface | I2C |
| Compatibility | mikroBUS |
| Click board size | M (42.9 x 25.4 mm) |
| Input Voltage | 3.3V or 5V |
PINOUT DIAGRAM
This table shows how the pinout of the Oximeter 5 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 |
OXIMETER 5 CLICK ELECTRICAL SPECIFICATIONS
| Description | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage | 3.3 | - | 5 | V |
| Red LED Wavelength | 650 | 660 | 670 | nm |
| Infrared LED Wavelength | 870 | 880 | 900 | nm |
| ADC Resolution | - | 18 | - | bits |
| Operating Temperature Range | -40 | +25 | +85 | °C |
Software Support
We provide a library for the Oximeter 5 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 the LibStock™ or found on MikroE Github account.
Library Description
This library contains API for the Oximeter 5 Click Board™ driver.
Key functions
-
oximeter5_read_sensor_dataOximeter 5 get sensor data function. -
oximeter5_get_oxygen_saturationOximeter 5 get oxygen saturation function. -
oximeter5_read_temperatureOximeter 5 read temperature function.
Example Description
This library contains API for the Oximeter 5 Click Board™ driver. The demo application reads and calculate SpO2 oxygen saturation data.
void application_task ( void )
{
for ( uint8_t n_cnt = 25; n_cnt < 100; n_cnt++ )
{
aun_red_buffer[ n_cnt - 25 ] = aun_red_buffer[ n_cnt ];
aun_ir_buffer[ n_cnt - 25 ] = aun_ir_buffer[ n_cnt ];
if ( un_min > aun_red_buffer[ n_cnt ] )
{
un_min = aun_red_buffer[ n_cnt ];
}
if ( un_max < aun_red_buffer[ n_cnt ] )
{
un_max=aun_red_buffer[n_cnt];
}
}
for ( uint8_t n_cnt = 75; n_cnt < 100; n_cnt++ )
{
un_prev_data = aun_red_buffer[ n_cnt - 1 ];
while ( oximeter5_check_interrupt( &oximeter5 ) == OXIMETER5_INTERRUPT_ACTIVE );
oximeter5_read_sensor_data( &oximeter5, &aun_red_buffer[ n_cnt ], &aun_ir_buffer[ n_cnt ] );
if ( aun_red_buffer[ n_cnt ] > un_prev_data )
{
f_temp = aun_red_buffer[ n_cnt ]-un_prev_data;
f_temp /= ( un_max - un_min );
f_temp *= MAX_BRIGHTNESS;
f_temp = un_brightness - f_temp;
if ( f_temp < 0 )
{
un_brightness = 0;
}
else
{
un_brightness = ( uint32_t ) f_temp;
}
}
else
{
f_temp = un_prev_data - aun_red_buffer[ n_cnt ];
f_temp /= ( un_max - un_min );
f_temp *= MAX_BRIGHTNESS;
un_brightness += ( uint32_t ) f_temp;
if ( un_brightness > MAX_BRIGHTNESS )
{
un_brightness = MAX_BRIGHTNESS;
}
}
if ( ( OXIMETER5_OK == oximeter5_get_oxygen_saturation( &aun_ir_buffer[ 0 ], 100, &aun_red_buffer[ 0 ], &n_spo2 ) ) )
{
if ( aun_ir_buffer[n_cnt] > 10000 )
{
log_printf( &logger, "tIR : %lu rn", aun_ir_buffer[ n_cnt ] );
log_printf( &logger, "tRED : %lu rn", aun_red_buffer[ n_cnt ] );
log_printf( &logger, "- - - - - - - - - - - - - - -rn" );
log_printf( &logger, "tSPO2 : %d %%rn", ( uint16_t ) n_spo2 );
log_printf( &logger, "-----------------------------rn" );
Delay_ms( 100 );
}
else
{
Delay_ms( 10 );
}
}
}
}
The full application code, and ready to use projects can be installed directly from NECTO Studio The package Manager (recommended), downloaded from the LibStock™ or found on the MikroE Github account.
O the r MikroE Libraries used in the example:
- MikroSDK.Board
- MikroSDK.Log
- Click.Oximeter5
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. UART terminal is available in all MikroElektronika compilers.
MIKROSDK
The Oximeter 5 Click Board™ is supported with the 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.
Oximeter 5 Click-Board
Frequently Asked Questions
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