Generated by XState Viz: https://xstate.js.org/viz

machine.js

// Goal: https://github.com/karlin/One_Button_Alarmduino/blob/master/One_Button_Alarmduino.ino
// Ref: https://xstate.js.org/docs/guides/activities.html
// Visualizer: https://xstate.js.org/viz/?gist=60570390017425aa339f8122dac22267

function createBeepingActivity(context, activity) {
  // Start the beeping activity
  const interval = setInterval(() => {
    console.log('BEEP!');
  }, context.intervalSeconds*1000);

  // Return a function that stops the beeping activity
  return () => clearInterval(interval);
}

const beepingStates = {
  initial: 'on',
  states: {
    on: {
      on: {
        ONE_SEC: 'off',
        actions: assign({
          buttonHeldSeconds: (context, event) =>
            context.buttonHeldSeconds + 1
        })
      }
    },
    off: {
      on: {
        ONE_SEC: 'on',
        actions: assign({
          buttonHeldSeconds: (context, event) =>
            context.buttonHeldSeconds + 1
        })
      }
    }
  }
};

const alarmduino = Machine(
  {
    id: 'alarm',
    initial: 'clock',
    context: {
      buttonPressed: false,
      snoozing: false,
      alarmOn: false,
      blinkColon: false,
      // int alarmTime: 641;
      snoozeDelay: 7,
      buttonHeldSeconds: 0,
      pressToDisableAlarmSeconds: 5,
      snoozeSeconds: () => {context.snoozeDelay*60},
      intervalSeconds: 1 // beep every second
    },
    states: {
      clock: {
        on: {
          "ALARM TIME": {
            target: 'inAlarm'
          }
        }
      },
      inAlarm: {
        activities: ['beeping'],
        on: {
          "PUSH BUTTON": {
            target: 'buttonDown',
            actions: assign({
              buttonPressed: (context, event) => true
            })
          }
        },
        ...beepingStates
      },
      buttonDown: {
        on: {
          "RELEASE BUTTON": {
            target: 'clock',
            actions: assign({
              buttonPressed: (context, event) => {
                if (context.buttonHeldSeconds > context.pressToDisableAlarmSeconds) {
                  return false;
                }
              }
            })
          }
        }
      }
    }
  },
  {
    activities: {
      beeping: createBeepingActivity
    }
  }
);