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Making Of Vehicle Horn System

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:

  1. Engine ON (System is in HORN State): The system will generate selected duty cycle at PWM pin  where Horn is connected. 
  2.  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%
  3. Increase/Decrease of switching frequency using two switches (GPIO Input): 
  4. After powering up the system, the system will start with factory calibrated PWM of 30% duty cycle. 
  5. The switching frequency can be increased or decreased using two switches. 
  6. 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: 
  7. If temperature is higher than 500 and less than 1000 decimal value, then system will switch to 10% duty cycle on PWM output to avoid thermal breakdown of the circuit.
  8. If temperature is higher than 1000 decimal value, the system must switch OFF the PWM output to zero. 
  9. Under normal conditions i.e. temperature value less than equal to 500, system will operate as it is and must generate calibrated PWM output.




Please visit following link to get all files related to this project and its procedure
Click Here

Software Used:-
1. Code Block for coding embedded c programme
2. SimulIDE for simulation of the circuit.

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