File content as of revision 1:126964580159:

#include "mbed.h"
#include "mRotaryEncoder.h"

// Simple demo for Hackaday
// Al Williams

// This require two Keyes modules (or equivalent)
// A KY-040 rotary encoder is connected to D7, D8 and the switch to D2
// D8 connects to CLK and D7 connects to DT
// if the rotation is backwards switch the wiring or swap the definitions in 
// software

// There is also a KY-016 RGB LED with integrated resistors
// This board plugs in with the ground pin next to D13
// then the other pins naturally hit D13, D12, and D11

PwmOut blueled(D13);
PwmOut greenled(D12);
PwmOut redled(D11);

// RGB values for  LEDS
PwmOut *leds[]={&redled, &greenled, &blueled};
float rgb[]={0.0, 0,0, 0.0};
int sel=0;  // which component are we changing?

DigitalIn mybutton(USER_BUTTON);  // not used here

// Here's the encoder object
mRotaryEncoder enc(D7,D8, D2,PullNone);


// Helper function to set the PWM values
void setleds()
{
    for (int i=0;i<sizeof(leds)/sizeof(leds[0]);i++) leds[i]->write(rgb[i]);
}


// Library calls here when you go clockwise
void cw()
{
// modify the selected RGB component    
   rgb[sel]+=0.1;
   if (rgb[sel]>1.0) rgb[sel]=1.0;
   setleds();
}

// Library calls here when you go anticlockwise
void ccw()
{
// modify the selected RGB component    
   rgb[sel]-=0.1;
   if (rgb[sel]<0.0) rgb[sel]=0.0;
   setleds();
}

// Library calls here when you push in on the encoder shaft
void btn()
{
    // change selected component (0, 1, 2)
    if (++sel>2) sel=0;
}

int main() {
// Set up encoder callbacks
    enc.attachROTCW(cw);
    enc.attachROTCCW(ccw);
    enc.attachSW(btn);
    // set fast period
    redled.period(0.01);
    greenled.period(0.01);
    blueled.period(0.01);
    while (true);   // nothing else to do but wait
}