main.cpp

00001 #include "mbed.h"
00002 #include <math.h>
00003 #include <stdlib.h>
00004 #include <stdio.h>
00005 
00006 PwmOut pwmA(PB_3); //D3
00007 PwmOut pwmB(PB_4); //D5
00008 
00009 
00010 int main() {
00011     
00012     char str[50];
00013     
00014     while(1) 
00015     { 
00016         printf("Enter a Voltage (-3.3 to 3.3 V) : \n");
00017         gets(str); //get string from terminal
00018         
00019         float voltage = atof(str); //convert str to float
00020         
00021         printf("You entered: %s\n Output Voltage = %f \n", str, voltage);
00022         
00023         if (voltage > 0.0){
00024             pwmB.write(0);
00025             float duty = voltage/3.3;
00026             printf("Duty Cycle: %f \n", duty);
00027             pwmA.period(0.0001);
00028             pwmA.write(duty);
00029         }
00030         else if (voltage < 0.0){
00031             pwmA.write(0);
00032             float duty = -(voltage)/3.3;
00033             printf("Duty Cycle: %f \n", duty);
00034             pwmB.period(0.0001);
00035             pwmB.write(duty);
00036         }
00037         else if (voltage == 0.0){
00038             pwmA.write(0);
00039             pwmB.write(0);
00040             pwmA.period(0.0001);
00041             pwmB.period(0.0001);
00042             float duty = 0;
00043             printf("Duty Cycle: %f \n", duty);
00044         }
00045         else if (voltage > 3.3 | voltage < -3.3){
00046             printf("Invalid Voltage input \n");
00047         }
00048     }
00049 }