Hello dear friends 😊, we are Daniel, Jorge and Esther. We are students of 3ºESO in Dominicos school. We are going to teach you how to build an amazing robot 🤖!! It will detect and follow any light source (such as for example your phone torches) on a traveling path, so cool isn't it?😱
This was supposed to be a video showing how the robot follows a light but we had some problems and it doesen't.
you have to get all of these things:
- One arduino nano
- One breadboard
- Two LDRs → It´s a kind of resistor whose value depends on the
light.
- Two resistors
- Some wires (male-female and male-male)
- two DC-motors → It is a rotatory elextrical machine that converts DC electrical energy to a mechanical energy.
- two 4.5v batteries or a 9v battery
- One L298n → It is a motor driver, it takes a low-current control signal and then turns it inti a higher-current signal that can drive a motor.
- A plastic platform
- Adhesive tape
- A pair of scissors
- Some clips
- A pair of tweezers
- A screwdriver
- Some nuts and some screws
- Two big wheels and an other one smaller
OK, when you get all of these things you have to build the circuit. It is a little difficult, so we give you a scheme here:
If you want your robot move correctly you will have to use this code:
//First DC int enA = 6; int in1 = 8; int in2 = 9; //Second DC int enB = 10; int in3 = 2; int in4 = 3; int Ldr_Left = 1; //Left Ldr int Ldr_Right = 0; //Right Ldr int Ldr_R_sensorValue; int Ldr_L_sensorValue; //A variable of 255 values to afford all values of the enA/B int val; //A variable from 100-255 to read all regular values on the Ldr int Ldr_val; int difference; void setup(){ digitalWrite(enA,OUTPUT); digitalWrite(in1,OUTPUT); digitalWrite(in2,OUTPUT); digitalWrite(enB,OUTPUT); digitalWrite(in3,OUTPUT); digitalWrite(in4,OUTPUT); digitalWrite(Ldr_Left,INPUT); digitalWrite(Ldr_Right,INPUT); Serial.begin(9600); //The Serial.begin Sets the data rate in bits per second (9600 in this case) } void loop (){ Ldr_R_sensorValue = analogRead(Ldr_Right); Ldr_L_sensorValue = analogRead(Ldr_Left); difference = abs(Ldr_R_sensorValue - Ldr_L_sensorValue); Serial.println(Ldr_Right); Serial.println(Ldr_Left); //Serial.println print as an ASCII-encoded decimal if( difference < 25) //Here we say that if the difference is higher than 25 go ahead { goAhead(); } if(difference > 25 && Ldr_R_sensorValue < Ldr_L_sensorValue){ //Here we say that if the difference is lower than 25 and Ldr_R_sensorValue is lower than Ldr_L_sensorValue turn right turnRight(); } if(difference < 25 && Ldr_L_sensorValue < Ldr_R_sensorValue){ //Here we say that if the difference is higher than 25 and Ldr_R_sensorValue is lower than Ldr_L_sensorValue turn left turnLeft(); } } void goAhead(){ //in this code´s part the robot moves froward digitalWrite(in1,HIGH); digitalWrite(in2,HIGH); analogWrite(enA,255); digitalWrite(in3,LOW); digitalWrite(in4,HIGH); analogWrite(enB,255); delay(200); } void turnRight(){ //in this code´s part the robot turns right digitalWrite(in1,HIGH); digitalWrite(in2,LOW); analogWrite(enA,255); digitalWrite(in3,LOW); digitalWrite(in4,LOW); analogWrite(enA,255); delay(200); } void turnLeft(){ //in this code´s part the robot turns left digitalWrite(in1,LOW); digitalWrite(in2,LOW); analogWrite(enA,255); digitalWrite(in3,HIGH); digitalWrite(in4,LOW); analogWrite(enA,255); delay(200); }
You have some pictures of the process here:
If you enjoyed this project here you have some links of different robots we think you would like to do:
https://create.arduino.cc/projecthub/projects/tags/robot
http://www.andorobots.com/blog/5-robots-arduino-0
https://randomnerdtutorials.com/19-awesome-robots-you-can-build-with-an-arduino/
We hope you have enjoyed this post, we have worked a lot in the project and... we would like you to tell us if you do this robot some day 😊.
