This code controls a DIY reactive night lamp that responds to sound and motion. The lamp consists of three LEDs (red, green, and blue) and a servo motor. The intensity of the LEDs and the rotation of the servo motor are controlled based on input from a sound sensor and a motion sensor.

• Red LED connected to PWM pin 11 (red)
• Green LED connected to PWM pin 10 (green)
• Blue LED connected to PWM pin 9 (blue)
• Sound sensor connected to analog pin 0 (sound)
• Motion sensor connected to PWM pin 12 (motion)

• state: Signals if the servo motor has reached its maximum rotation (LOW or HIGH).
• d: Determines how fast the servo motor spins by delaying the rotation.
• k: Stores the value from the sound sensor.
• t: Acts as a time variable to cycle through the LEDs.
• r: Initial incremental value for the position of the servo motor.
• a1, a2, a3: Variables for the luminosity of each LED.
• v: Maximum luminosity of the LEDs.

This code utilizes the Servo library to control the servo motor.

In the setup() function:

• IO pins are set for the LEDs, sound sensor, and motion sensor.
• The servo motor is attached to PWM pin 3.
• The servo motor is initialized at the 0th position.
• Serial communication is initiated at a baud rate of 115200.

The loop() function continuously runs the main logic of the code.

1. Sound Sensor Input:

   • If the analog reading from the sound sensor is above 490, the value is multiplied by 0.8 and assigned to k.
   • Otherwise, k is set to 0.

2. LED Luminosity:

   • a1, a2, and a3 are calculated based on the current value of t and k, using the sin function and absolute values.
   • The LED luminosity is controlled by multiplying the calculated values with the maximum luminosity v.
   • The analogWrite() function is used to set the PWM output for each LED.

3. Time Increment:

   • The value of t is incremented by 0.0006 to cycle through the LEDs.

4. Motion Sensor Input:

   • If the motion sensor detects motion (HIGH), the servo motor's rotating motion is triggered.
   • The d variable determines the speed of rotation. If d is equal to 150, the servo motor's position (pos) is incremented by 1.
   • d is then decreased by 0.02. If d is still greater than 0, the servo motor remains at its current position.
   • If d becomes 0, the servo motor's position is updated to r, and r is incremented or decremented based on the current state.
   • If r reaches 180, state is set to HIGH. If state is HIGH, r is decremented until it reaches 0, and then state is set to LOW.
   • The servo motor's position is updated using myservo.write().

The code continues to run in an infinite loop, repeating the above steps.