Traffic light

LED (generic)

Jumper wires (generic)

Breadboard (generic)

Ultrasonic Sensor - HC-SR04 (Generic)

5 mm LED: Yellow

USB-A to Mini-USB Cable

Arduino UNO

Arduino IDE

5 mm LED: Green

<pre ><code >// defines pins numbers const int trigPin = 9; const int echoPin = 8; const int led1 = 12; const int led2 = 11; const int led3 =6; const int led4 =5; const int led5 =2; const int led6 = 3; // defines variables long duration; int distance; int safetyDistance; void setup() { pinMode(trigPin, OUTPUT); // Sets the trigPin as an Output pinMode(echoPin, INPUT); // Sets the echoPin as an Input pinMode(led1, OUTPUT); pinMode(led2, OUTPUT); pinMode(led3, OUTPUT); pinMode(led4, OUTPUT); pinMode(led5, OUTPUT); pinMode(led6, OUTPUT); Serial.begin(9600); // Starts the serial communication } void loop() { // Clears the trigPin digitalWrite(trigPin, LOW); delayMicroseconds(2); // Sets the trigPin on HIGH state for 10 micro seconds digitalWrite(trigPin, HIGH); delayMicroseconds(10); digitalWrite(trigPin, LOW); // Reads the echoPin, returns the sound wave travel time in microseconds duration = pulseIn(echoPin, HIGH); // Calculating the distance distance= duration*0.034/2; safetyDistance = distance; if (safetyDistance>20 && safetyDistance<35) { digitalWrite(led1,HIGH); digitalWrite(led2,HIGH); digitalWrite(led3, LOW); digitalWrite(led4, LOW); digitalWrite(led5, LOW); digitalWrite(led6, LOW); } else if(safetyDistance>17 && safetyDistance<25) { digitalWrite(led1, LOW); digitalWrite(led2, LOW); digitalWrite(led3, HIGH); digitalWrite(led4, HIGH); digitalWrite(led5, LOW); digitalWrite(led6, LOW); } else if(safetyDistance<=10) { digitalWrite(led1, LOW); digitalWrite(led2, LOW); digitalWrite(led3, LOW); digitalWrite(led4, LOW); digitalWrite(led5, HIGH); digitalWrite(led6, HIGH); } else { digitalWrite(led1, LOW); digitalWrite(led2, LOW); digitalWrite(led3, LOW); digitalWrite(led4, LOW); digitalWrite(led5, LOW); digitalWrite(led6, LOW); } // Prints the distance on the Serial Monitor Serial.print("Distance: "); Serial.println(distance); } </code></pre>

diagram for code

Traffic light

Detection of harsh driving