#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
#define OLED_RESET -1
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);
#define PRESSURE_PIN A0
#define LED_PIN 7
float voltage;
float pressure;
const float LOW_PRESSURE = 28.0;
const float HIGH_PRESSURE = 36.0;
void setup() {
Serial.begin(9600);
pinMode(LED_PIN, OUTPUT);
// Initialize OLED
if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
Serial.println("OLED not found");
while (1);
}
display.clearDisplay();
display.setTextSize(1);
display.setTextColor(WHITE);
}
void loop() {
int adc = analogRead(PRESSURE_PIN);
// Convert to voltage
voltage = adc * (5.0 / 1023.0);
// Convert to pressure
pressure = ((voltage - 0.5) / 4.0) * 100.0;
if (pressure < 0) pressure = 0;
Serial.print("Voltage = ");
Serial.print(voltage);
Serial.print(" V Pressure = ");
Serial.print(pressure);
Serial.println(" PSI");
// OLED DISPLAY
display.clearDisplay();
display.setCursor(0, 0);
display.println("Tire Monitor");
display.setCursor(0, 15);
display.print("Volt: ");
display.print(voltage, 2);
display.println(" V");
display.setCursor(0, 30);
display.print("ضغط: ");
display.print(pressure, 1);
display.println(" PSI");
// Warning logic
if (pressure < LOW_PRESSURE || pressure > HIGH_PRESSURE) {
digitalWrite(LED_PIN, HIGH);
display.setCursor(0, 50);
display.println("WARNING!");
Serial.println("⚠ WARNING: Tire Pressure Abnormal!");
} else {
digitalWrite(LED_PIN, LOW);
display.setCursor(0, 50);
display.println("Normal");
}
display.display();
delay(500);
}