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Step 2: Write the code: ```c const int piezoPin = A0; // Piezo sensor input int state = LOW; void setup() { pinMode(piezoPin, INPUT); } void loop() { state = digitalRead(piezoPin); if (state == HIGH) { digitalWrite(13, HIGH); // LED1 ON delayMicroseconds(1000); // wait for 1 second digitalWrite(13, LOW); // LED1 OFF } } ``` This code will cause the first LED to turn on when the piezo sensor detects sound (e.g., a hand clap) and stay on for about one...