This is my first ever attempt at programming, beyond "Hello world".
I was surprised that it compiled at all and astonished that it actually seems to be doing what I want it to! It's the first step in a much larger project.
The comments in the code should explain it all.
Any criticism/suggestions/improvements/comments are most welcome.
Martin
/*This sketch was produced to manage a
3-phase motor using a potentiometer to
control both direction and speed.
The middle of the travel of the pot is "off"
with the speed in either direction increasing
with clockwise or anticlockwise turning.
*/
int potPin = 2; // select the input pin
//for the potentiometer
int phase1 = 10; // select the output
int phase2 = 11; // pins for each
int phase3 = 12; // of the phases
int val = 0; /* variable to store the
value coming from
the pot*/
void setup()
{
pinMode(phase1, OUTPUT); //declare the
pinMode(phase2, OUTPUT); // phase pins
pinMode(phase3, OUTPUT); // as OUTPUTs
}
void loop()
{
{digitalWrite(13, LOW);} //This LED will
//indicate the centre
//off posistion later,
//turn it off for now.
val = analogRead(potPin); // Read the value from
// the potentiometer.
int speedForward = 2*(1023 - val); /* This expression
reverses the values beyond
512 so that the longest
delay (slowest speed)
lies at the RH
end of the range.
Multiply by 2 to restore
to maximum value of 1024*/
int speedReverse = 2*(val); //Only need to multiply.
if (val > 542) //Values from 482 to 542
// is "dead zone" to switch
//off motor. See "else if"
{
digitalWrite(phase1, HIGH); // For 3 phases there are 6
delay(speedForward/6); // transitions per revolution.
digitalWrite(phase3, LOW); // This switches them on and
delay(speedForward/6); // off in the correct order
digitalWrite(phase2, HIGH); // in the right-hand half
delay(speedForward/6); // of the travel of the pot,
digitalWrite(phase1, LOW); // for clockwise rotation.
delay(speedForward/6); //
digitalWrite(phase3, HIGH); //
delay(speedForward/6); //
digitalWrite(phase2, LOW); //
delay(speedForward/6); //
}
else if (val < 482)
{
digitalWrite(phase3, HIGH);
delay(speedReverse/6); //
digitalWrite(phase1, LOW); //
delay(speedReverse/6); //
digitalWrite(phase2, HIGH); //
delay(speedReverse/6); // The same as above,
digitalWrite(phase3, LOW); // on the left-hand side,
delay(speedReverse/6); // for anticlockwise rotation.
digitalWrite(phase1, HIGH); //
delay(speedReverse/6); //
digitalWrite(phase2, LOW); //
delay(speedReverse/6); //
}
else
digitalWrite(phase1, LOW); // Dead zone, everything off...
digitalWrite(phase2, LOW);
digitalWrite(phase3, LOW);
{digitalWrite(13, HIGH);} //except the LED, which
//indicates "off"
}
