https://github.com/lin775533/light-level-detection-and-automation-system

https://github.com/lin775533/light-level-detection-and-automation-system

Last synced: about 2 months ago
JSON representation

• Host: GitHub
• URL: https://github.com/lin775533/light-level-detection-and-automation-system
• Owner: Lin775533
• Created: 2024-10-21T19:26:58.000Z (3 months ago)
• Default Branch: master
• Last Pushed: 2024-10-22T00:36:06.000Z (3 months ago)
• Last Synced: 2024-10-22T13:21:25.221Z (3 months ago)
• Language: Python
• Size: 807 KB
• Stars: 0
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

Awesome Lists containing this project

README

        
# IoT Light Sensing Project

## Table of Contents

1. [Components](#components)

2. [System Overview](#system-overview)

3. [Hardware Setup](#hardware-setup)

   - [ESP8266 Setup](#esp8266-setup)

   - [Raspberry Pi Setup](#raspberry-pi-setup)

4. [Communication Protocol](#communication-protocol)

5. [Main Functionality](#main-functionality)

6. [System Flow](#system-flow)

   - [Raspberry Pi Flow](#raspberry-pi-flow)

   - [ESP8266 Flow](#esp8266-flow)

7. [Demo](#demo)

## Components

- Raspberry Pi

- ESP8266

- Photoresistor (Light Sensor)

- LEDs (Red, Yellow, Green, and White)

- Buttons (Start/Reset, UDP Packet Loss Simulation)

## System Overview

This IoT project uses a Raspberry Pi and an ESP8266 to monitor light levels using a photoresistor. The ESP8266 collects data and sends it to the Raspberry Pi, which then displays the light level using LEDs.

## Hardware Setup

### ESP8266 Setup

1. **Photoresistor (Analog Light Sensor):**

   - One side: Connected to 3.3V

   - Other side: Connected to A0 (analog input) on the ESP8266

   - Use a 10kΩ pull-down resistor between the photoresistor and ground

2. **Onboard LED:** No extra connections needed (controlled via code)

![ESP8266 Schematic](./media/Picture1.png)

### Raspberry Pi Setup

1. **LEDs:** All LEDs use a 330Ω resistor between the GPIO pin and LED anode

   - Red LED: GPIO 27

   - Yellow LED: GPIO 22

   - Green LED: GPIO 23

   - White LED: GPIO 24

2. **Button:**

   - Connected to GPIO 15

   - Other leg connected to GND (pin 6)

   - 10kΩ pull-down resistor between the button and GND

![Raspberry Pi Schematic](./media/Picture2.png)

## Communication Protocol

- Uses UDP for communication between Raspberry Pi and ESP8266

- Raspberry Pi IP: 192.168.1.xxx

- ESP8266 IP: 192.168.1.xxx

### UDP Message Flow & Data Transmission

1. **Start Communication:**

   - Raspberry Pi → ESP8266: "START"

   - ESP8266 → Raspberry Pi: "DATA: " (every 2 seconds)

2. **Error Handling:**

   - If no response from ESP8266 for 10 seconds:

     - White LED flashes every 0.5 seconds

     - Button press required to reset and re-establish communication

3. **Stop Communication:**

   - Raspberry Pi → ESP8266: "STOP"

   - ESP8266 halts data collection and turns off its onboard LED

## Main Functionality

1. **Initialization:** Button press on Raspberry Pi activates white LED and starts communication

2. **ESP8266 Response:** Flashes LED, collects data, sends average light sensor value every 2 seconds

3. **Raspberry Pi Reaction:** Controls RGB LEDs based on received light value (LOW, MEDIUM, HIGH)

4. **Error Handling:** White LED flashes if no data received for 10 seconds

5. **Reset:** Button press stops data collection and resets both devices

## System Flow

### Raspberry Pi Flow

![Raspberry Pi Flowchart](./media/Picture3.png)

### ESP8266 Flow

![ESP8266 Flowchart](./media/Picture4.png)

## Demo

[Demo Video](https://drive.google.com/file/d/1iB5b1A3w3z4M8ymoQmxHrwyPXidl_wKg/view?usp=drive_link)