ece 4180 lab 3
Dependencies: mbed wave_player mbed-rtos 4DGL-uLCD-SE SDFileSystem X_NUCLEO_53L0A1 HC_SR04_Ultrasonic_Library
part2.h
- Committer:
- emilywilson
- Date:
- 2020-02-27
- Revision:
- 4:1ef667567942
- Parent:
- 2:4845e2dae429
File content as of revision 4:1ef667567942:
#include "mbed.h" #include "ultrasonic.h" Serial pc(USBTX, USBRX); void dist(int distance) { //put code here to execute when the distance has changed pc.printf("Distance %d mm\r\n", distance); } ultrasonic mu(p6, p7, .1, 1, &dist); //Set the trigger pin to p6 and the echo pin to p7 //have updates every .1 seconds and a timeout after 1 //second, and call dist when the distance changes int run_part2() { mu.startUpdates();//start measuring the distance while(1) { //Do something else here mu.checkDistance(); //call checkDistance() as much as possible, as this is where //the class checks if dist needs to be called. } } //Theremin style demo using HC-SR04 Sonar and a speaker // moving a hand away/towards sonar changes audio frequency DigitalOut audio(p26); //output to speaker amp or audio jack DigitalOut led(LED1); DigitalOut led2(LED2); Timeout cycle; volatile int half_cycle_time = 1; //two calls to this interrupt routine generates a square wave void toggle_interrupt() { if (half_cycle_time>22000) audio=0; //mute if nothing in range else audio = !audio; //toggle to make half a square wave led = !led; cycle.detach(); //update time for interrupt activation -change frequency of square wave cycle.attach_us(&toggle_interrupt, half_cycle_time); } void newdist(int distance) { //update frequency based on new sonar data led2 = !led2; half_cycle_time = distance<<3; } //HC-SR04 Sonar module ultrasonic mu2(p6, p7, .07, 1, &newdist); //Set the trigger pin to p6 and the echo pin to p7 //have updates every .07 seconds and a timeout after 1 //second, and call newdist when the distance changes int run_part2_EC() { audio = 0; led = 0; cycle.attach(&toggle_interrupt, half_cycle_time); mu2.startUpdates();//start measuring the distance with the sonar while(1) { //Do something else here mu2.checkDistance(); //call checkDistance() as much as possible, as this is where //the class checks if dist needs to be called. } }