Albertas Galin / Mbed 2 deprecated Reaction_timer

Human(oid) reaction time measurement Basic buttons,leds,timer,wait usage examples

Dependencies:   mbed

main.cpp@0:436ae35cdd94, 2015-04-30 (annotated)

Committer:
albertas
Date:
Thu Apr 30 20:02:06 2015 +0000
Revision:
0:436ae35cdd94
Rev1.0. by AG

Who changed what in which revision?

UserRevisionLine numberNew contents of line
albertas 0:436ae35cdd94 1 /*
albertas 0:436ae35cdd94 2 Reaction time measurement
albertas 0:436ae35cdd94 3 Result output to terminal
albertas 0:436ae35cdd94 4 your result should be about 0.220+-0.060s
albertas 0:436ae35cdd94 5 best result https://www.youtube.com/watch?v=XsU5AMxvlKg (youtube)
albertas 0:436ae35cdd94 6 */
albertas 0:436ae35cdd94 7 #include "mbed.h"
albertas 0:436ae35cdd94 8
albertas 0:436ae35cdd94 9 DigitalOut myled(LED1); //define LED
albertas 0:436ae35cdd94 10 DigitalIn mybutton(USER_BUTTON); //define BUTTON
albertas 0:436ae35cdd94 11 Timer t; //define timer
albertas 0:436ae35cdd94 12 int x; //x for random number storage
albertas 0:436ae35cdd94 13
albertas 0:436ae35cdd94 14 int main()
albertas 0:436ae35cdd94 15 {
albertas 0:436ae35cdd94 16 printf("Reaction test!\n");
albertas 0:436ae35cdd94 17 printf("Push the button when the LED is on!\n");
albertas 0:436ae35cdd94 18
albertas 0:436ae35cdd94 19 while(1) {
albertas 0:436ae35cdd94 20
albertas 0:436ae35cdd94 21 while(1) {
albertas 0:436ae35cdd94 22
albertas 0:436ae35cdd94 23 x=rand()%2000; //generate random number 0-2000
albertas 0:436ae35cdd94 24 wait_ms(1000+x); //wait random time between 1 and 3 seconds
albertas 0:436ae35cdd94 25
albertas 0:436ae35cdd94 26 t.start(); //start the timer
albertas 0:436ae35cdd94 27
albertas 0:436ae35cdd94 28 if(mybutton == 0)break; //to early for push or cheating
albertas 0:436ae35cdd94 29
albertas 0:436ae35cdd94 30 myled=1; //LED on
albertas 0:436ae35cdd94 31
albertas 0:436ae35cdd94 32 while(1) { //wait for push
albertas 0:436ae35cdd94 33 if (mybutton == 0)break;
albertas 0:436ae35cdd94 34 }
albertas 0:436ae35cdd94 35
albertas 0:436ae35cdd94 36 t.stop(); //stop the timer
albertas 0:436ae35cdd94 37
albertas 0:436ae35cdd94 38 myled=0; //LED off
albertas 0:436ae35cdd94 39
albertas 0:436ae35cdd94 40 printf("The time taken was %f seconds\n", t.read());
albertas 0:436ae35cdd94 41
albertas 0:436ae35cdd94 42 t.reset(); //reset the timer
albertas 0:436ae35cdd94 43
albertas 0:436ae35cdd94 44 wait(0.5); //debounce the BUTTON
albertas 0:436ae35cdd94 45
albertas 0:436ae35cdd94 46 }
albertas 0:436ae35cdd94 47 printf("Cheeting!!!\n");
albertas 0:436ae35cdd94 48 wait(0.5);//debounce the BUTTON
albertas 0:436ae35cdd94 49 }
albertas 0:436ae35cdd94 50 }