Tyre-Inflator-Project

A tyre inflator project for the PIC18F45K22

About the Project

This project is an automatic tire inflator designed to simplify and automate the inflation process. It features a GLCD display for real-time feedback, buttons for user interaction, and sensors to monitor temperature and pressure. The system uses a state machine for efficient operation, PWM for compressor control, and serial communication for debugging and potential extensions. It has been developed on the PIC18F45K22 microcontroller with the EASYPIC7 board.

Features

User Interaction

• GLCD display to present status, sensor readings, and animations.
• Buttons for user input:
  • Increase Pressure: Increment the desired tyre pressure (RC0).
  • Decrease Pressure: Decrement the desired tyre pressure (RC1).
  • Confirm Selection: Confirm the desired pressure (RC2).
  • Emergency Stop: Stop the inflator immediately (RC3).

Control System

• State machine for managing operational states.
• Automatic adjustment of compressor power based on:
  • Desired pressure.
  • Initial pressure.
  • Ambient temperature.

Sensors and Monitoring

• Temperature Sensor (NTC): Monitors ambient temperature (AN6).
• Pressure Sensor: Simulated with a potentiometer to measure tyre pressure (1kΩ between 0V and 5V).
• Detection of tyre punctures:
  • Alerts if pressure decreases unexpectedly during inflation.

Compressor Control

• PWM output to regulate compressor power (RE0).
• Power levels based on pressure:
  • ≤30 PSI: 40%.
  • ≤60 PSI: 80%.
  • ≤90 PSI: 95%.

Status Indication

• Digital outputs for LED indicators:
  • Selection State: RA0.
  • Inflation in Progress: RA1.
  • Process Completed: RA2.

Visual Feedback

• Progress bar indicating remaining time for inflation.
• Animations for:
  • Inflation process.
  • Button interactions.
  • Process completion.
  • Alerts for puncture detection.

Serial Communication

• USART communication for debugging and as an alternative to button presses:
  • Transmit (Tx1): RC6.
  • Receive (Rx1): RC7.
  • d: increase pressure
  • a: decrease pressure
  • s: select pressure
  • w: emergency stop

Documentation

• Usage
• Functions