Weston and Ivan / Mbed 2 deprecated EW202FP_Hall

Lights blink when a magnet is detected

Dependencies:   mbed

main.cpp@1:c847f1af2942, 2019-04-29 (annotated)

Committer:
m211002
Date:
Mon Apr 29 17:20:55 2019 +0000
Revision:
1:c847f1af2942
Parent:
0:f556205c07a6 
hall effect code

Who changed what in which revision?

UserRevisionLine numberNew contents of line
m211002 0:f556205c07a6 1 #include "mbed.h"
m211002 0:f556205c07a6 2 Serial pc(USBTX,USBRX);
m211002 0:f556205c07a6 3
m211002 0:f556205c07a6 4 // Hall effect sensor
m211002 0:f556205c07a6 5 DigitalIn hall(p21);
m211002 0:f556205c07a6 6 DigitalOut hallpwr(p22);
m211002 0:f556205c07a6 7
m211002 0:f556205c07a6 8 InterruptIn event(p21);
m211002 0:f556205c07a6 9 DigitalOut led1(LED1);
m211002 0:f556205c07a6 10 DigitalOut led4(LED4);
m211002 0:f556205c07a6 11
m211002 0:f556205c07a6 12 int hallvalue;
m211002 0:f556205c07a6 13 int hallstatus=0;
m211002 0:f556205c07a6 14 void trigger()
m211002 0:f556205c07a6 15 {
m211002 1:c847f1af2942 16 while (hallstatus!=0) { // when triggered the lead will send out a light and reset the hallstatus
m211002 0:f556205c07a6 17 led1=1;
m211002 0:f556205c07a6 18 wait(1);
m211002 0:f556205c07a6 19 led1=0;
m211002 0:f556205c07a6 20 hallstatus=0;
m211002 0:f556205c07a6 21 }
m211002 0:f556205c07a6 22 }
m211002 0:f556205c07a6 23 int main()
m211002 0:f556205c07a6 24 {
m211002 1:c847f1af2942 25 hall.mode(PullUp); // brings up the sensor values
m211002 1:c847f1af2942 26 hallpwr=0; // sets the power readings
m211002 0:f556205c07a6 27 wait(0.2);
m211002 1:c847f1af2942 28 hallpwr =1;// sets the power readings
m211002 0:f556205c07a6 29 wait(0.2);
m211002 1:c847f1af2942 30 event.rise(&trigger); //starts the outside tigger fuctions when something happens on pin 21
m211002 0:f556205c07a6 31 while(1) {
m211002 1:c847f1af2942 32 hallvalue=hall.read();// reads in hall effect values of (0 &1)
m211002 1:c847f1af2942 33 if (hallvalue==1) { // if the value read in is 1 then there is a change in status
m211002 0:f556205c07a6 34 hallstatus=1;
m211002 0:f556205c07a6 35 }
m211002 0:f556205c07a6 36 pc.printf("hallvalues:%d\n\r",hallvalue);
m211002 0:f556205c07a6 37 wait(0.25);
m211002 0:f556205c07a6 38 }
m211002 0:f556205c07a6 39 }