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ECE 4180 Final Project
Dependencies: mbed PulseSensor mbed-rtos LSM9DS1_Library_cal
main.cpp
- Committer:
- zhihanzhang
- Date:
- 2021-12-14
- Revision:
- 10:63d223104806
- Parent:
- 9:dcbd546412ea
File content as of revision 10:63d223104806:
#include "mbed.h" #include "rtos.h" #include "LSM9DS1.h" #include "PulseSensor.h" #define PI 3.14159 // Earth's magnetic field varies by location. Add or subtract // a declination to get a more accurate heading. Calculate // your's here: // http://www.ngdc.noaa.gov/geomag-web/#declination #define DECLINATION -4.94 // Declination (degrees) in Atlanta, GA. LSM9DS1 IMU(p28, p27, 0xD6, 0x3C); Timer timer; /* Skin temp Heart beat Human resistance Step count */ // IMU //filter_avg_t acc_data; //axis_info_t acc_sample; //peak_value_t acc_peak; //slid_reg_t acc_slid; uint8_t step = 1; float threshold = 1.8; // skin temp AnalogIn skinTemp(p19); uint8_t temp_skin = 25; //Heart beat uint8_t bpm = 70; //Human resistance AnalogIn gsr(p17); AnalogIn sig(p18); uint8_t Human_Resistance = 128; float gsrValue = 0; float phasic = 0; float baseline = 0; int on = 1, off = 0; Serial pc(USBTX, USBRX); RawSerial dev(p9,p10); DigitalOut led1(LED1); DigitalOut led4(LED4); struct gyro { float x; float y; float z; }; struct acce { float x; float y; float z; }; char imu_data[24]; void sendDataToProcessing(int data) { pc.printf("%d\r\n", data); bpm = data; } void step_counter(void const *arg) { //peak_value_init(&acc_peak); struct acce ac2; float mag; timer.start(); while(1) { while(!IMU.accelAvailable()); //pc.printf("11\n"); IMU.readAccel(); ac2.x = IMU.calcAccel(IMU.ax); ac2.y = IMU.calcAccel(IMU.ay); ac2.z = IMU.calcAccel(IMU.az); mag = sqrt(pow(ac2.x, 2) + pow(ac2.y, 2) + pow(ac2.z, 2)); if (mag > threshold && timer.read_ms() > 300) { //pc.printf("%d \n\r", timer.read_ms()); step += 1; timer.stop(); timer.reset(); timer.start(); } Thread::wait(5); } //while (1) { // uint16_t i = 0; // float temp = 0; // // for (i = 0; i < FILTER_CNT; i++) // { // while(!IMU.accelAvailable()); // //pc.printf("11\n"); // IMU.readAccel(); // ac2.x = IMU.calcAccel(IMU.ax); // ac2.y = IMU.calcAccel(IMU.ay); // ac2.z = IMU.calcAccel(IMU.az); // // temp = ac2.x * DATA_FACTOR; // acc_data.info[i].x = (short)(temp); // // temp = ac2.y * DATA_FACTOR; // acc_data.info[i].y = (short)temp; // // temp = ac2.z * DATA_FACTOR; // acc_data.info[i].z = (short)temp; // // Thread::wait(5); // } // // filter_calculate(&acc_data, &acc_sample); // // peak_update(&acc_peak, &acc_sample); // // slid_update(&acc_slid, &acc_sample); // // detect_step(&acc_peak, &acc_slid, &acc_sample); // // timer.stop(); // if(timer.read_ms() <= 20) // Thread::wait(20 - timer.read_ms()); // //Thread::wait(5); // // } } void skin_temp(void const *arg) { float R1 = 4700*1.4773; //thermistor resistance at 15C float R2 = 4700; //thermistor resistance at 25C float R3 = 4700*0.69105; //thermistor resistance at 35C float T1 = 288.15; //15C float T2 = 298.15; //25C float T3 = 308.15; //35C float L1 = log(R1); float L2 = log(R2); float L3 = log(R3); float Y1 = 1/T1; float Y2 = 1/T2; float Y3 = 1/T3; float g2 = (Y2-Y1)/(L2-L1); float g3 = (Y3-Y1)/(L3-L1); float C = (g3-g2)/(L3-L2)*(1/(L1+L2+L3)); float B = g2 - C*(L1*L1 + L1*L2 + L2*L2); float A = Y1 - L1*(B + L1*L1*C); float Vt; while(1) { Vt = skinTemp; //float R = 9900*(1/Vt - 1); //9900 is the resistance of R1 in voltage divider float R = 4900 * Vt / (1 - Vt); float T = 1/(A + B*log(R) + C*log(R)*log(R)*log(R)); //pc.printf("Vt: %f\n\r", Vt); //pc.printf("R: %f\n\r", R); temp_skin=(uint8_t)(T-273.15); //pc.printf("temp: %d\n", temp_skin); //pc.printf("Skin temp: %f C\n\r", T-273.15); Thread::wait(100); } } // calculate baseline to compare against void Get_Baseline(void) { double sum = 0; wait(1); for(int i=0; i<500; i++) { gsrValue = sig; sum += gsrValue ; wait(0.005); } baseline = sum/500; //printf("baseline = %f\n\r", baseline); } // main loop, compare against baseline // sound buzzer if a >5% change happens void hum_R(void const *arg) { float delta; float Serial_Port_Reading; int hr; Get_Baseline(); while(1) { gsrValue = gsr; phasic = sig; delta = gsrValue - phasic; if(abs(delta) > 0.05) { gsrValue = gsr; delta = baseline - gsrValue; } hr = 254* (phasic); //pc.printf("HR!!: %f\n", phasic); //Human_Resistance = ((1024+2*Serial_Port_Reading)*10000)/(512-Serial_Port_Reading); Human_Resistance = hr; Thread::wait(100); } } //void heartRate(void const *arg) { // while (1) { // bpm = rand() % 21 + 70; // //bpm += (x - 5); // Thread::wait(2000); // } //} int main() { //pc.baud(9600); //dev.baud(9600); IMU.begin(); if (!IMU.begin()) { pc.printf("Failed to communicate with LSM9DS1.\n"); } IMU.calibrate(1); pc.printf("IMU end\n"); PulseSensor sensor(p15, sendDataToProcessing); sensor.start(); Thread t1(step_counter); Thread t2(skin_temp); Thread t3(hum_R); //Thread t4(heartRate); pc.printf("Main Loop\n"); while(1) { dev.putc(0xff); dev.putc(temp_skin); dev.putc(bpm); dev.putc(Human_Resistance); dev.putc(step); dev.putc(0xff); //pc.printf("%d\n\r", rand() % 31 + 60); Thread::wait(200); } // struct acce ac2; // while(1) { // // IMU.readAccel(); // ac2.x = IMU.calcAccel(IMU.ax); // ac2.y = IMU.calcAccel(IMU.ay); // ac2.z = IMU.calcAccel(IMU.az); // pc.printf("%f \n\r", sqrt(pow(ac2.x, 2) + pow(ac2.y, 2) + pow(ac2.z, 2))); // wait(0.1); // } }