Ruben Lucas / Mbed 2 deprecated BrightButton

Test script for PwmOut control LED with buttons

Dependencies:   mbed

main.cpp@1:9654405c52f4, 2018-09-28 (annotated)

Committer:
rubenlucas
Date:
Fri Sep 28 07:22:53 2018 +0000
Revision:
1:9654405c52f4
Parent:
0:2ba57c4723ea 
if statements not equal to 1.0 and 0.0 but just a bit below. rounding error prevention

Who changed what in which revision?

UserRevisionLine numberNew contents of line
rubenlucas 0:2ba57c4723ea 1 #include "mbed.h"
rubenlucas 0:2ba57c4723ea 2 #include "math.h"
rubenlucas 0:2ba57c4723ea 3
rubenlucas 0:2ba57c4723ea 4 PwmOut Led(D3);
rubenlucas 0:2ba57c4723ea 5 InterruptIn Brighter(D1);
rubenlucas 0:2ba57c4723ea 6 InterruptIn Dimmer(D0);
rubenlucas 0:2ba57c4723ea 7 Ticker checkTicker;
rubenlucas 0:2ba57c4723ea 8
rubenlucas 0:2ba57c4723ea 9 volatile float DutyCycle = 0.2; // set start cycle percentage of 20% (this is free of choice)
rubenlucas 0:2ba57c4723ea 10 volatile float Percentage;
rubenlucas 0:2ba57c4723ea 11
rubenlucas 0:2ba57c4723ea 12 void BrighterFcn()
rubenlucas 0:2ba57c4723ea 13 {
rubenlucas 1:9654405c52f4 14 if (DutyCycle >= 0.9) // check if duty cycle is already at max
rubenlucas 0:2ba57c4723ea 15 {return;}
rubenlucas 0:2ba57c4723ea 16 else
rubenlucas 0:2ba57c4723ea 17 {DutyCycle = DutyCycle + 0.025;} // raise duty cycle with 2.5%
rubenlucas 0:2ba57c4723ea 18 }
rubenlucas 0:2ba57c4723ea 19
rubenlucas 0:2ba57c4723ea 20 void DimmerFcn()
rubenlucas 0:2ba57c4723ea 21 {
rubenlucas 1:9654405c52f4 22 if (DutyCycle <= 0.1) // check if duty cycle is already at minimum
rubenlucas 0:2ba57c4723ea 23 {return;}
rubenlucas 0:2ba57c4723ea 24 else
rubenlucas 0:2ba57c4723ea 25 {DutyCycle = DutyCycle - 0.025;} // lower duty cycle with 2.5%
rubenlucas 0:2ba57c4723ea 26 }
rubenlucas 0:2ba57c4723ea 27
rubenlucas 0:2ba57c4723ea 28 void CheckDutyCycle()
rubenlucas 0:2ba57c4723ea 29 {
rubenlucas 0:2ba57c4723ea 30 Percentage = DutyCycle;
rubenlucas 0:2ba57c4723ea 31 }
rubenlucas 0:2ba57c4723ea 32
rubenlucas 0:2ba57c4723ea 33 int main()
rubenlucas 0:2ba57c4723ea 34 {
rubenlucas 0:2ba57c4723ea 35 float frequency = 10000; // 10 kHz
rubenlucas 0:2ba57c4723ea 36 Led.period(1/frequency); // set fixed period
rubenlucas 0:2ba57c4723ea 37 Brighter.rise(&BrighterFcn); //call function to raise dutycycle percentage if button is pressed and released
rubenlucas 0:2ba57c4723ea 38 Dimmer.rise(&DimmerFcn); //call function to lower dutycycle percentage if button is pressed and released
rubenlucas 0:2ba57c4723ea 39 checkTicker.attach(&CheckDutyCycle, 0.05); // call for percentage with 20 Hz to make the working smoother
rubenlucas 0:2ba57c4723ea 40
rubenlucas 0:2ba57c4723ea 41 while (true)
rubenlucas 0:2ba57c4723ea 42 {
rubenlucas 0:2ba57c4723ea 43 Led.write(Percentage);
rubenlucas 0:2ba57c4723ea 44 wait(0.1f);
rubenlucas 0:2ba57c4723ea 45 }
rubenlucas 0:2ba57c4723ea 46 }