The code below will...
start at 4.3 seconds, countdown to zero, wait 3 seconds, reset and wait for new input (sound detection).
.... except I don't have a sound detector so I used a button, and I don't have a display so that would need to be added:
// https://forum.arduino.cc/index.php?topic=631679
// 16 august 2019 meltDown
// OP asked for "start at 4.3 seconds, countdown to zero, wait 3 seconds,
// reset and wait for new input (sound detection)."
//meltDown has no sound detector, so just using a button
//also display stuff needs to be added
//has a proofOfLife pulse on 13 to prove there's no blocking
enum {ST_WAITING, ST_COUNTING_DOWN, ST_RESETTING} currentState = ST_WAITING;
// enum just allocates integers from the left so ST_WAITING=0, ST_ST_COUNTING_DOWN =1
// just makes it easier to have human relatable names in the switch..case later
unsigned long previousPulseMillis;
int pulseInterval = 500;
bool pulseLedState = LOW;
byte pulseLedPin = 13;
byte soundDetector = 12; //actually just a button
int countdownPeriod = 4300;
int resetPeriod = 3000;
unsigned long weStartedTimingAt;
unsigned long weStartedResetAt;
bool messageDisplayedOnce = false;
void setup()
{
pinMode(LED_BUILTIN, OUTPUT);
pinMode(soundDetector, INPUT_PULLUP);
Serial.begin(9600);
Serial.println("Forum thread 631679");
Serial.println("Setup done...");
}//setup
void loop()
{
proofOfLife();
doStates();
}//loop
void proofOfLife()
{
if (millis() - previousPulseMillis >= pulseInterval)
{
pulseLedState = !pulseLedState;
digitalWrite(pulseLedPin, pulseLedState);
previousPulseMillis = millis();;
}
}
void doStates()
{
switch (currentState)
{
case ST_WAITING:
if (!messageDisplayedOnce)
{
Serial.println("\nWaiting for hit... (actually a button press)");
messageDisplayedOnce = true;
}
if (!digitalRead(soundDetector)) //ie, button is pressed
{
weStartedTimingAt = millis();
messageDisplayedOnce = false;
currentState = ST_COUNTING_DOWN;
}
break;
case ST_COUNTING_DOWN:
if (!messageDisplayedOnce)
{
Serial.print("Counting down from ");
Serial.print(countdownPeriod);
Serial.println(" (add display stuff)");
messageDisplayedOnce = true;
}
if (millis() - weStartedTimingAt >= countdownPeriod)
{
weStartedResetAt = millis();
messageDisplayedOnce = false;
currentState = ST_RESETTING;
}
break;
case ST_RESETTING:
if (!messageDisplayedOnce)
{
Serial.print("Waiting for ");
Serial.print(resetPeriod);
Serial.println(" (add display stuff)");
messageDisplayedOnce = true;
}
if (millis() - weStartedResetAt >= resetPeriod)
{
messageDisplayedOnce = false;
currentState = ST_WAITING;
}
break;
}//switch
}//doStates
In my mind, it should be pretty simple
It is....
But I already know that's not how code works!
It's exactly how code works (or it's how a programmer makes it work, anyway)
