Automotive Horn System is a standalone module which is controlled by Microcontroller by generating switching frequencies that can be calibrated. The following are the preconditions for Horn Operation: Engine ON (System is in HORN State): The system will generate selected duty cycle at PWM pin where Horn is connected. Engine OFF: (System is in Calibration State): The switching frequency or Duty cycle can be increased or decreased by 5% through two calibration switches w.r.t default value ie. 30% Increase/Decrease of switching frequency using two switches (GPIO Input): After powering up the system, the system will start with factory calibrated PWM of 30% duty cycle. The switching frequency can be increased or decreased using two switches. Thermal and safety feature: In horn state, system will check the temperature value using analog input to avoid thermal breakdown of Horn system as per below conditions: If temperature is higher than 500 and less than 1000 decimal value