MIKROE-2036

Page 1 of 2 Heart rate 3 click From MikroElektonika Documentation Heart Rate 3 click is a mikroBUS™ add-on board whose functionality is determined by two components: an OSRAM’s SFH7050 pulse oximetry and heart rate monitoring module, and a TI AFE4404 (analong-front-end) IC specialized for bio-sensing. Heart rate 3 click Features and usage notes Heart Rate 3 click is a mikroBUS™ add-on board whose functionality is determined by two components: an OSRAM’s SFH7050 pulse oximetry and heart rate monitoring module, and a TI AFE4404 (analong-frontend) IC specialized for bio-sensing. Schematic also available in PDF (http://cdndocs.mikroe.com/images/d/d1/Heart_Rate_3_click_sc The SFH7050 multichip package contains 3 LEDs and one photodiode separated with a light barrier to prevent optical crosstalk. When the three LEDs shine through a subject’s finger, some of the light is absorbed by the pulsating blood. The analog reading from the SFH7050 is forwarded to the AFE chip that is able to derive pulse readings from the intensity of the reflected light. Heart rate 3 click IC/Module AFE4404 is highly-configurable and adaptable for different usage scenarios (different lighting conditions or skin tones) making Heart Rate 3 click a robust heart rate monitoring solution. SFH7050 (http://www.osramos.com/media/resource/HIRES/541656/246267/lightis-wearable---flysheet-biomon-sensor-sfh-7050gb.pdf) The board communicates with the target MCU through the mikroBUS™ I2C interface, with additional functionality provided by RST, CLK and RDY pins. Heart Rate 3 click works on a 3.3V power supply, but an onboard jumper allows you to set the voltage for driving the SFH7050 LEDs at either 3.3V or 5V. AFE4404 (http://www.ti.com/lit/ds/symlink/afe4404.pdf) Interface I2C Power supply 3.3V Website www.mikroe.com/click/heart-rate-3 (http://www.mikroe.com/click/heart-rate-3) Programming Setting up of Heartrate 3 click and external interrupt to read values at 100hz and using an algorithm to find a heartrate. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 #include #include "heartrate_3.h" #include "resources.h" // HeartRate 3 GPIO sbit RST at GPIOC_ODR.B2; void system_setup( void ); void setup_interrupt(); char uart_text[20] = {0}; uint64_t int_count = 0; //Used by timer to calibrate sampling freq. void main() { //Local Declarations uint16_t rate = 0; char txt[15] = {0}; system_setup(); Delay_ms(200); initStatHRM(); setup_interrupt(); // GPIO / HeartRate 3 / UART / I2C Setups // Initializes values to 0 // Setup interrupt handler while(1) { rate = hr3_get_heartrate(); } IntToStr( rate, uart_text ); UART1_Write_Text( uart_text ); UART1_Write_Text( "\r\n" ); } void system_setup( void ) { //Local Declarations char text[40] = { 0 }; Page 2 of 2 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 dynamic_modes_t dynamic_modes; uint8_t address = 0x58; //Set up dynamic modes for Heart Rate 3 Initialization dynamic_modes.transmit = trans_dis; //Transmitter disabled dynamic_modes.curr_range = led_double; //LED range 0 - 100 dynamic_modes.adc_power = adc_on; //ADC on dynamic_modes.clk_mode = osc_mode; //Use internal Oscillator dynamic_modes.tia_power = tia_off; //TIA off dynamic_modes.rest_of_adc = rest_of_adc_off; //Rest of ADC off dynamic_modes.afe_rx_mode = afe_rx_normal; //Normal Receiving on AFE dynamic_modes.afe_mode = afe_normal; //Normal AFE functionality //GPIO setup GPIO_Digital_Output( &GPIOC_BASE, _GPIO_PINMASK_2 ); GPIO_Digital_Input( &GPIOA_BASE, _GPIO_PINMASK_0 ); GPIO_Digital_Input( &GPIOD_BASE, _GPIO_PINMASK_10 ); //UART Initialize UART1_Init( 9600 ); UART1_Write_Text( "UART is Initialized\r\n" ); //Toggle Reset pin RST = 0; Delay_us(50); RST = 1; //I2C Initialize I2C1_Init_Advanced( 400000, &_GPIO_MODULE_I2C1_PB67 ); UART1_Write_Text( "I2C Initialized\r\n" ); //Heart Rate 3 Initialize hr3_init( address, &dynamic_modes ); } void setup_interrupt() { GPIO_Digital_Output(&GPIOE_BASE, _GPIO_PINMASK_HIGH); GPIOE_ODR = 0xAAAA; GPIO_Digital_Input(&GPIOD_BASE, _GPIO_PINMASK_10); } RCC_APB2ENR.AFIOEN = 1; AFIO_EXTICR3 = 0x0300; EXTI_RTSR = 0x00000400; EXTI_IMR |= 0x00000400; NVIC_IntEnable(IVT_INT_EXTI15_10); EnableInterrupts(); // // // // // // // Enable digital output on PORTD Enable clock for alternate pin functions PD10 as External interrupt Set interrupt on Rising edge Set mask Enable External interrupt Enables the processor interrupt. void ExtInt() iv IVT_INT_EXTI15_10 ics ICS_AUTO { EXTI_PR.B10 = 1; // clear flag int_count++; statHRMAlgo( hr3_get_led1_amb1_val() ); // Give led1 ambient value to heartrate function. ( 100 times a second ) } Code examples that demonstrate the usage of Heart rate 3 click with MikroElektronika hardware, written for mikroC for ARM, AVR, dsPIC, FT90x, PIC and PIC32 are available on Libstock (http://libstock.mikroe.com/projects/view/1908/heart-rate-3-click). Resources - Learn article explaining Heart rate 3 click library (http://learn.mikroe.com/microcontrollers-have-a-heart-too/) - Libstock Heart rate 3 click example (http://libstock.mikroe.com/projects/view/1908/heart-rate-3-click) Retrieved from "http://docs.mikroe.com/index.php?title=Heart_rate_3_click&oldid=764" ◾ This page was last modified on 7 September 2016, at 17:53. ◾ Content is available under Creative Commons Attribution unless otherwise noted. http://docs.mikroe.com/Heart_rate_3_click 9/15/2016