ARDUINO RADAR SYSTEM

1#include <Servo.h>
2
3Servo myServo;
4
5const int trigPin = 2;
6const int echoPin = 9;
7
8int angle = 0;
9int direction = 1;
10
11int minAngle = 0;
12int maxAngle = 75;
13
14unsigned long lastServoMove = 0;
15unsigned long lastSensorRead = 0;
16
17int distance = 0;
18
19void setup() {
20  Serial.begin(9600);
21
22  pinMode(trigPin, OUTPUT);
23  pinMode(echoPin, INPUT);
24
25  myServo.attach(11);
26}
27
28void loop() {
29
30  // ✅ SMOOTH + NOT TOO FAST SERVO
31  if (millis() - lastServoMove >= 20) {   // balanced speed
32    lastServoMove = millis();
33
34    angle += direction;   // step = 1 (smooth)
35
36    if (angle >= maxAngle) {
37      angle = maxAngle;
38      direction = -1;
39    }
40
41    if (angle <= minAngle) {
42      angle = minAngle;
43      direction = 1;
44    }
45
46    myServo.write(angle);
47  }
48
49  // 📡 SENSOR READ
50  if (millis() - lastSensorRead >= 50) {
51    lastSensorRead = millis();
52
53    distance = getDistance();
54
55    // 🔴 ONLY UNDER 10 CM
56    if (distance > 10 || distance == 0) {
57      distance = 0;
58    }
59
60    Serial.print(angle);
61    Serial.print(",");
62    Serial.print(distance);
63    Serial.print(".");
64  }
65}
66
67// 📏 DISTANCE FUNCTION (STABLE)
68int getDistance() {
69
70  digitalWrite(trigPin, LOW);
71  delayMicroseconds(2);
72
73  digitalWrite(trigPin, HIGH);
74  delayMicroseconds(10);
75  digitalWrite(trigPin, LOW);
76
77  long duration = pulseIn(echoPin, HIGH, 25000);
78
79  if (duration == 0) return 0;
80
81  int dist = duration * 0.034 / 2;
82
83  return dist;
84}
85
86
87
88
89
90
91// processing code
92
93
94
95import processing.serial.*;
96
97Serial myPort;
98
99String data = "";
100
101int iAngle = 0;
102int iDistance = 0;
103int index1;
104
105float pixsDistance;
106
107PFont font;
108
109void setup() {
110  size(1280, 720);
111  smooth();
112
113  println(Serial.list());
114
115  // ✅ SELECT CORRECT PORT (change index if needed)
116  myPort = new Serial(this, Serial.list()[0], 9600);
117  myPort.bufferUntil('.');
118
119  font = createFont("Arial", 20, true);
120  textFont(font);
121}
122
123void draw() {
124
125  // 🔥 Smooth fade background
126  fill(0, 15);
127  noStroke();
128  rect(0, 0, width, height);
129
130  fill(0, 255, 0);
131
132  drawRadar();
133  drawLine();
134  drawObject();
135  drawText();
136}
137
138// ✅ READ SERIAL DATA
139void serialEvent(Serial myPort) {
140  data = myPort.readStringUntil('.');
141
142  if (data != null) {
143    data = trim(data);
144
145    if (data.contains(",")) {
146      index1 = data.indexOf(',');
147
148      try {
149        iAngle = int(data.substring(0, index1));
150        iDistance = int(data.substring(index1 + 1));
151      } catch (Exception e) {
152        // ignore bad data
153      }
154    }
155  }
156}
157
158// 🟢 RADAR GRID
159void drawRadar() {
160  pushMatrix();
161  translate(width/2, height - height * 0.08);
162
163  noFill();
164  stroke(0, 255, 0);
165  strokeWeight(2);
166
167  arc(0, 0, width, width, PI, TWO_PI);
168  arc(0, 0, width * 0.75, width * 0.75, PI, TWO_PI);
169  arc(0, 0, width * 0.5, width * 0.5, PI, TWO_PI);
170  arc(0, 0, width * 0.25, width * 0.25, PI, TWO_PI);
171
172  line(-width/2, 0, width/2, 0);
173
174  popMatrix();
175}
176
177// 🟢 SCANNING LINE
178void drawLine() {
179  pushMatrix();
180  translate(width/2, height - height * 0.08);
181
182  strokeWeight(4);
183
184  if (iDistance > 0) {
185    stroke(255, 0, 0); // red if object
186  } else {
187    stroke(0, 255, 0);
188  }
189
190  line(0, 0,
191    (height * 0.9) * cos(radians(iAngle)),
192    -(height * 0.9) * sin(radians(iAngle)));
193
194  popMatrix();
195}
196
197// 🔴 OBJECT DOT (ONLY ≤10 cm)
198void drawObject() {
199  pushMatrix();
200  translate(width/2, height - height * 0.08);
201
202  if (iDistance > 0 && iDistance <= 10) {
203
204    pixsDistance = map(iDistance, 0, 10, 0, height * 0.9);
205
206    stroke(255, 0, 0);
207    strokeWeight(10);
208
209    point(
210      pixsDistance * cos(radians(iAngle)),
211      -pixsDistance * sin(radians(iAngle))
212    );
213  }
214
215  popMatrix();
216}
217
218// 📝 TEXT INFO
219void drawText() {
220  fill(0);
221  noStroke();
222  rect(0, height - 60, width, 60);
223
224  fill(0, 255, 0);
225  textSize(22);
226
227  text("Angle: " + iAngle + "°", 50, height - 20);
228  text("Distance: " + iDistance + " cm", 250, height - 20);
229
230  if (iDistance > 0) {
231    text("OBJECT DETECTED", 500, height - 20);
232  } else {
233    text("NO OBJECT", 500, height - 20);
234  }
235}