# Weather Station with PIR Sensor and Displays

This project is a simple weather station that uses a variety of sensors and displays to provide weather information and detect human presence in a room. The system integrates a DHT22 sensor for temperature and humidity, a PIR sensor for motion detection, and displays the information on an OLED display and a MAX7219 matrix display.

## Components Used

- **Raspberry Pi Pico W**: Microcontroller for managing sensors and displays.
- **DHT22 Sensor**: Measures temperature and humidity.
- **PIR Motion Sensor**: Detects human presence.
- **Adafruit SSD1306 OLED Display**: Displays weather information.
- **MD_MAX72XX Matrix Display**: Displays motion detection status.
- **Wiring**: Connects all components to the microcontroller.


help.md

#include <Wire.h>
#include <Adafruit_SSD1306.h>
#include <Adafruit_GFX.h>
#include <MD_MAX72XX.h>
#include <DHT.h>

// Pin definitions
const int PIR_PIN = 7;
const int DHT22_PIN = 6;

// Initialize PIR sensor
int pirState = LOW;
int val = 0;

// Initialize DHT22 sensor
DHT dht(DHT22_PIN, DHT22);

// Initialize I2C for OLED and MAX7219
#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
#define OLED_RESET    -1
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

// MAX7219 matrix configuration
#define DATA_PIN   12
#define CS_PIN     10
#define CLK_PIN    11
#define MAX_DEVICES 1
MD_MAX72XX matrix = MD_MAX72XX(DATA_PIN, CLK_PIN, CS_PIN, MAX_DEVICES);

void setup() {
  Serial.begin(9600);

  // Initialize PIR sensor
  pinMode(PIR_PIN, INPUT);

  // Initialize DHT22 sensor
  dht.begin();

  // Initialize OLED display
  if(!display.begin(SSD1306_I2C_ADDRESS, 0x3D)) {
    Serial.println(F("SSD1306 allocation failed"));
    for(;;);
  }
  display.display();
  delay(2000); // Pause for 2 seconds

  // Initialize MAX7219 matrix display
  matrix.begin();
  matrix.setIntensity(0); // Set brightness level (0 is min, 15 is max)
  matrix.clear();
}

void loop() {
  // Read DHT22 sensor
  float humidity = dht.readHumidity();
  float temperature = dht.readTemperature();

  // Check if any reads failed and exit early (to try again).
  if (isnan(humidity) || isnan(temperature)) {
    Serial.println(F("Failed to read from DHT sensor!"));
    return;
  }

  // Read PIR sensor
  pirState = digitalRead(PIR_PIN);
  
  // Display weather information on OLED
  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(SSD1306_WHITE);
  display.setCursor(0, 0);
  display.print("Temperature: ");
  display.print(temperature);
  display.println(" C");
  display.print("Humidity: ");
  display.print(humidity);
  display.println(" %");
  display.display();

  // Highlight the matrix if motion is detected
  if (pirState == HIGH) {
    highlightDetection();
  } else {
    clearMatrix();
  }

  delay(2000); // Wait for 2 seconds
}

// Function to highlight detected human on the matrix
void highlightDetection() {
  matrix.clear(); // Clear the matrix
  // Example pattern: checkerboard
  for (int i = 0; i < 8; i++) {
    for (int j = 0; j < 8; j++) {
      if ((i + j) % 2 == 0) {
        matrix.setPoint(i, j, true); // Set pixel to white
      }
    }
  }
  matrix.update(); // Update the matrix display
}

// Function to clear the matrix
void clearMatrix() {
  matrix.clear();
  matrix.update();
}


sketch.ino

diagram.json

# Wokwi Library List
# See https://docs.wokwi.com/guides/libraries

# Automatically added based on includes:
Adafruit GFX Library
DHT sensor library

Adafruit SSD1306
MD_MAX72XX
