So you wanna build a robot which never hits anything; you’ve come to the right place ! It barely takes 15 minutes to do this ! So without wasting our time let’s learn how to make an obstacle avoiding robot !
Requirements :-
- Chassis OR any toy car.
- Arduino UNO/Mega.
- Ultrasonic sensor HC SR-04.
- 2 DC motors.
- 9V/12V 1A battery.
- Motor driver module L298.
- Jumpers.
- Single stranded wires.
- A pizza slice & a can of beer to celebrate 😉
Procedure :-
So yes, I’m going to divide the whole making into 4 parts –
Connections of Ultrasonic sensor → Connections of L298N → Code → Testing
If you haven’t used or experimented before with the ultrasonic sensor, I would suggest you to get familiar with it first ! I have a detail tutorial on ultrasonic sensor HC SR-04 which will guide you throughout !
Here is detailed Tutorial on Ultrasonic Sensor HC-SR04
Connections :-
Connections for Obstacle avoiding robot
Connections of Ultrasonic sensor –
- VCC – VCC terminal of Arduino.
- GND – GND terminal of Arduino.
- Trigpin – digital pin 9 on Arduino.
- Echo pin – digital pin 10 on Arduino.
Connections of L298N –
- +12V – Positive terminal of the battery.
- GND – a)GND of Arduino b)Negative terminal of battery.
- Input terminal 1 – Pin 4
- Input terminal 2 – Pin 5
- Input terminal 3 – Pin 6
- Input terminal 4 – Pin 7
- Output terminal 1 – Positive of first motor.
- Output terminal 2 – Negative of first motor.
- Output terminal 3 – Positive of second motor.
- Output terminal 4 – Negative of second motor.
Coding :-
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 | int trigPin = 9; int echoPin = 10; int revright = 4; //REVerse motion of Right motor int fwdleft = 7; int revleft= 6; int fwdright= 5; //ForWarD motion of Right motor int c = 0; void setup() { //Serial.begin(9600); pinMode(5, OUTPUT); pinMode(6, OUTPUT); pinMode(4, OUTPUT); pinMode(7, OUTPUT); pinMode(trigPin, OUTPUT); pinMode(echoPin, INPUT); // put your setup code here, to run once: } void loop() { long duration, distance; digitalWrite(trigPin,HIGH); delayMicroseconds(1000); digitalWrite(trigPin, LOW); duration=pulseIn(echoPin, HIGH); distance =(duration/2)/29.1; //Serial.print(distance); //Serial.println("CM"); delay(10); if((distance>20)) { digitalWrite(5,HIGH); // If you dont get proper movements of your robot, digitalWrite(4,LOW); // then alter the pin numbers digitalWrite(6,LOW); // digitalWrite(7,HIGH); // } else if(distance<20) { digitalWrite(5,HIGH); digitalWrite(4,LOW); digitalWrite(6,HIGH); //HIGH digitalWrite(7,LOW); } } |
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Testing :-
If the distance detected by the ultrasonic sensor is less than 25cm, then the bot will take a turn else, it will keep moving straight ! Simple… right ?
Well, here is a video tutorial which will make your job more easy !
Do I need to say this, NO… but anyway I will,
If you have any problem regarding connections or coding or during interfacing, all you have to do is comment down below OR contact me 🙂 I’ll very happy to help you
