Iain Veitch / Mbed 2 deprecated ME21001_Lab04_Exercise_04

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Dependencies:   mbed

main.cpp@0:a06d2b459821, 2018-10-16 (annotated)

Committer:
iveitch
Date:
Tue Oct 16 17:54:19 2018 +0000
Revision:
0:a06d2b459821
Lab 4 Ex 4

Who changed what in which revision?

UserRevisionLine numberNew contents of line
iveitch 0:a06d2b459821 1 /**************************************************************
iveitch 0:a06d2b459821 2 / ME21001 Group m-nn
iveitch 0:a06d2b459821 3 /
iveitch 0:a06d2b459821 4 / Lab 04 Exercise 4
iveitch 0:a06d2b459821 5 /
iveitch 0:a06d2b459821 6 / This program reads an analogue input and displays the results
iveitch 0:a06d2b459821 7 / to the PC
iveitch 0:a06d2b459821 8 /
iveitch 0:a06d2b459821 9 */
iveitch 0:a06d2b459821 10 #include "mbed.h"
iveitch 0:a06d2b459821 11 Serial pc(USBTX, USBRX); // USB serial interface
iveitch 0:a06d2b459821 12
iveitch 0:a06d2b459821 13 AnalogIn A_in(p17); // analogue input pin for reference values
iveitch 0:a06d2b459821 14 PwmOut led1(LED1);
iveitch 0:a06d2b459821 15 PwmOut led2(LED2);
iveitch 0:a06d2b459821 16 PwmOut led3(LED3);
iveitch 0:a06d2b459821 17 PwmOut led4(LED4);
iveitch 0:a06d2b459821 18 int main() {
iveitch 0:a06d2b459821 19
iveitch 0:a06d2b459821 20 float analogue_val=0.0; // variable to hold the analogue input
iveitch 0:a06d2b459821 21 // values as decimals
iveitch 0:a06d2b459821 22 // set the USB serial interface baud rate
iveitch 0:a06d2b459821 23 led1.period(0.020);
iveitch 0:a06d2b459821 24 led2.period(0.020);
iveitch 0:a06d2b459821 25 led3.period(0.020);
iveitch 0:a06d2b459821 26 led4.period(0.020);
iveitch 0:a06d2b459821 27
iveitch 0:a06d2b459821 28
iveitch 0:a06d2b459821 29 while(1) { // repeat indefinitely
iveitch 0:a06d2b459821 30
iveitch 0:a06d2b459821 31 // read the voltage on the analogue input pin and
iveitch 0:a06d2b459821 32 // convert it to a
iveitch 0:a06d2b459821 33 // decimal number with 12-bit resolution
iveitch 0:a06d2b459821 34
iveitch 0:a06d2b459821 35 analogue_val = A_in.read(); // export the readings to a terminal program
iveitch 0:a06d2b459821 36 // via the USB cable
iveitch 0:a06d2b459821 37 if( analogue_val<0.25){
iveitch 0:a06d2b459821 38 led1=(analogue_val/0.25);
iveitch 0:a06d2b459821 39 led2=led3=led4=0;
iveitch 0:a06d2b459821 40 }
iveitch 0:a06d2b459821 41 else if (analogue_val<0.5){
iveitch 0:a06d2b459821 42 led1=1;
iveitch 0:a06d2b459821 43 led2=((analogue_val-0.25)/0.25);
iveitch 0:a06d2b459821 44 led3=led4=0;
iveitch 0:a06d2b459821 45 }
iveitch 0:a06d2b459821 46 else if (analogue_val<0.75){
iveitch 0:a06d2b459821 47 led1=led2=1;
iveitch 0:a06d2b459821 48 led3=((analogue_val-0.5)/0.25);
iveitch 0:a06d2b459821 49 led4=0;
iveitch 0:a06d2b459821 50 }
iveitch 0:a06d2b459821 51 else{
iveitch 0:a06d2b459821 52 led1=led2=led3=1;
iveitch 0:a06d2b459821 53 led4=((analogue_val-0.75)/0.25);
iveitch 0:a06d2b459821 54 }
iveitch 0:a06d2b459821 55 wait(0.l);
iveitch 0:a06d2b459821 56 }
iveitch 0:a06d2b459821 57 }
iveitch 0:a06d2b459821 58
iveitch 0:a06d2b459821 59