arduino state machine code examples - Making Things Interactive

}// if we didn't set the initial state when we created the variable,// we'd do it here. The initial state is "off" or "start" in most// state machines, but if you only hvae active/on states, pick an// appropriate starting state.//// currentState = sOff;Serial.begin(9600);void loop(){BlinkStatusLed();// Every time through the loop we check the state we're in with a// series of if/else if statements. the first thing we do is check// to see if we should be in a different state. If not, then we go// ahead and do whatever this state says we should do// There probably shouldn't be anything outside of your state// machine if() statements other than a status marker like// BlinkStatusLed(). If there's something you think should happen// that isn't in the state machine, re-think your state machine!// and yes, we could have done this with a switch statement, but we// haven't learned those yet.// STATE OFFif (currentState == sOff) {Serial.println("off"); // from off, the only place we can go is calibrate, and that's // only if the switch is turned on if (digitalRead(switchPin) == HIGH) { currentState = sCalibrate; }}// STATE CALIBRATEif (currentState == sCalibrate) {Serial.println("calibrate"); // first, have we been turned off? if (digitalRead(switchPin) == LOW) { currentState = sOff; } else { // if we're on, calibrate our photosensor // in calibrate, we take one reading every second for a // set number of seconds, then average them and use that // as our starting value to compare against. int val = 0; int numReads = 5;