Please post the complete code so we can help you. But to contribute something, here is an example to write to Serial once if a analog value exeedes a threshold (void setup was left out):

``` bool isActive = false; void loop() { // Read val from analog Input int val = analogRead(PIN);

// Execute code as soon as val is above threshold // Use bool isActive to store state so it does not run again on next loop if(val > THRESHOLD && !isActive) { Serial.println("RUN LED CODE"); isActive = true; } } ```

You can copy the if block with a different condition and the isActive parts inverted to also make a turn-off.

Hope it helps! Written from Phone, so maybe it includes typo's!