Arduino Master-Slave Sensor Monitoring System

Project Overview

This project involves designing a master-slave microcontroller system using Tinkercad. The system utilizes two Arduino boards to monitor environmental conditions and control physical outputs based on a predefined state machine.

Reference Materials

Before beginning, please review the following tutorials on Arduino basics and circuit design:

• Short Tutorial Video
• Comprehensive Tutorial Playlist

Hardware Requirements

• 2x Arduino Boards (Configured to communicate in a Master-Slave setup)
• Sensor Arduino (Master):
  • Photoresistor (LDR)
  • Gas Sensor
  • Temperature Sensor
  • Servo Motor
  • Piezo Buzzer
• Display/Control Arduino (Slave):
  • LCD Screen
  • IR Sensor and Remote

Addendum(26/8),

• please use a 1Kohm Resister as your gas sensor pulldown resistor.
• You must use I2C to make the Arduino's communicate
• You may use a normal screen or an I2C screen, however using an I2C screen would be awarded extra points if BOTH the other code and the screen work properly.

System Logic: State Machine

The system must operate strictly based on the following states and conditions:

State 0: Standby

• Trigger: System is powered on.
• Action: Sensors are powered but inactive. The system waits for an activation command via the IR remote.
• LCD Output: "AWAITING RITUAL"

State 1: Active Monitoring

• Trigger: Activation command received from the IR remote.
• Action: The Master Arduino actively polls the photoresistor and gas sensor.
• Controls: The user can press a button on the IR remote to toggle the LCD display between showing ambient light levels and gas/air purity percentages.

State 2: Gas Alert

• Trigger: Gas sensor reads >180 units of volatile compounds.
• Action: Overrides standard LCD telemetry.
• LCD Output: "TOXIC PURGE"
• Resolution: The system stays in this state until gas levels drop below 130 units, returning automatically to State 1.

State 3: Blackout Alert

• Trigger: Photoresistor detects a sudden, absolute drop in ambient light.
• Action: The system ignores standard IR commands until lighting is restored and logs the event.
• LCD Output: "NOCTIS PROTOCOL"

State 4: Temperature Emergency (Highest Priority)

• Trigger: Temperature sensor registers above 45°C.
• Action: This state strictly overrides States 0, 1, 2, and 3. The servo motor actuates to 180 degrees (simulating emergency venting).
• LCD Output: "COOKED"
• Resolution: Requires a manual reset command sent via the IR Remote to exit this state.

Multi-Fault State

• Trigger: A combination of State 2 and State 3 occurring simultaneously (excluding State 4).
• Action: The Piezo buzzer sounds continuously.
• LCD Output: "MULTIPLE PROBLEMS DETECTED"
• Resolution: Automatically resolves to the appropriate state if the sensor readings change.

Submission Guidelines

• Submit a .txt file with a link to the tinkercad task as a comment in your code.
• Follow the main Induction Repo's submission guidelines.

Changelog

• Added pulldown resistor reccomendations
• gas sensor threshold changed to 180 instead of 130