CODE
#include <Servo.h>
#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 TRIG_PIN 9
#define ECHO_PIN 10
#define SERVO_PIN 11
#define BUZZER_PIN 12 // 🔔 Buzzer on Pin 12
#define LED_PIN 13 // 💡 LED on Pin 13
Servo servo;
const int maxDistance = 50;
const int centerX = SCREEN_WIDTH / 2;
const int centerY = SCREEN_HEIGHT - 1;
const int maxRadius = 50;
struct Blip {
float angle;
int distance;
unsigned long timestamp;
bool active;
};
Blip blips[20];
int blipCount = 0;
unsigned long lastUpdate = 0;
const long fadeTime = 3000;
int currentAngle = 0;
int currentDistance = 0;
// For buzzer & LED timing
unsigned long lastToggle = 0;
bool toggleState = false;
void setup() {
pinMode(TRIG_PIN, OUTPUT);
pinMode(ECHO_PIN, INPUT);
pinMode(BUZZER_PIN, OUTPUT);
pinMode(LED_PIN, OUTPUT);
digitalWrite(BUZZER_PIN, LOW);
digitalWrite(LED_PIN, LOW);
servo.attach(SERVO_PIN);
servo.write(0);
if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
for(;;);
}
display.clearDisplay();
display.display();
}
float measureDistance() {
digitalWrite(TRIG_PIN, LOW);
delayMicroseconds(2);
digitalWrite(TRIG_PIN, HIGH);
delayMicroseconds(10);
digitalWrite(TRIG_PIN, LOW);
long duration = pulseIn(ECHO_PIN, HIGH, 30000);
if (duration == 0) return maxDistance;
float distance = duration * 0.034 / 2;
return (distance > maxDistance) ? maxDistance : distance;
}
void addBlip(float angle, int distance) {
if (blipCount < 20 && distance < maxDistance) {
blips[blipCount].angle = angle;
blips[blipCount].distance = distance;
blips[blipCount].timestamp = millis();
blips[blipCount].active = true;
blipCount++;
}
}
void updateBlips() {
unsigned long currentTime = millis();
for (int i = 0; i < blipCount; i++) {
if (blips[i].active && (currentTime - blips[i].timestamp > fadeTime)) {
blips[i].active = false;
for (int j = i; j < blipCount - 1; j++) {
blips[j] = blips[j + 1];
}
blipCount--;
i--;
}
}
}
void drawBlips() {
unsigned long currentTime = millis();
for (int i = 0; i < blipCount; i++) {
if (blips[i].active) {
float age = (currentTime - blips[i].timestamp) / (float)fadeTime;
int x = centerX + (blips[i].distance * maxRadius / maxDistance) * cos(radians(blips[i].angle));
int y = centerY - (blips[i].distance * maxRadius / maxDistance) * sin(radians(blips[i].angle));
if (age < 0.5) {
display.drawLine(x-2, y-2, x+2, y+2, SSD1306_WHITE);
display.drawLine(x-2, y+2, x+2, y-2, SSD1306_WHITE);
} else {
display.drawPixel(x, y, SSD1306_WHITE);
}
}
}
}
void drawRadar() {
display.drawCircle(centerX, centerY, maxRadius / 2, SSD1306_WHITE);
display.drawCircle(centerX, centerY, maxRadius, SSD1306_WHITE);
}
void drawInfo() {
display.setTextSize(1);
display.setTextColor(SSD1306_WHITE);
display.setCursor(0, 0);
display.print("Angle:");
display.print(currentAngle);
display.setCursor(SCREEN_WIDTH - 60, 0);
display.print("Dist:");
display.print(currentDistance);
display.print("cm");
}
void handleBuzzerAndLED() {
unsigned long currentTime = millis();
if (currentDistance < maxDistance) {
if (currentTime - lastToggle >= 500) { // 0.5 sec on/off
toggleState = !toggleState;
digitalWrite(BUZZER_PIN, toggleState);
digitalWrite(LED_PIN, toggleState);
lastToggle = currentTime;
}
} else {
digitalWrite(BUZZER_PIN, LOW);
digitalWrite(LED_PIN, LOW);
toggleState = false;
}
}
void loop() {
static int angle = 0;
static bool forward = true;
static unsigned long lastServoMove = 0;
static unsigned long lastMeasurement = 0;
unsigned long currentTime = millis();
if (currentTime - lastServoMove >= 25) {
servo.write(angle);
currentAngle = angle;
if (forward) {
angle += 2;
if (angle >= 180) {
angle = 180;
forward = false;
}
} else {
angle -= 2;
if (angle <= 0) {
angle = 0;
forward = true;
}
}
lastServoMove = currentTime;
}
if (currentTime - lastMeasurement >= 100) {
currentDistance = (int)measureDistance();
if (currentDistance < maxDistance) {
addBlip(angle, currentDistance);
}
lastMeasurement = currentTime;
}
handleBuzzerAndLED(); // 🔔💡 Handle buzzer & LED
if (currentTime - lastUpdate >= 33) {
display.clearDisplay();
updateBlips();
drawRadar();
int sweepX = centerX + maxRadius * cos(radians(angle));
int sweepY = centerY - maxRadius * sin(radians(angle));
display.drawLine(centerX, centerY, sweepX, sweepY, SSD1306_WHITE);
drawBlips();
drawInfo();
display.display();
lastUpdate = currentTime;
}
}