Mukesh Sankhla
Published © CC BY-NC-SA

BrailleBot

Your very own Braille language trainer!

AdvancedFull instructions provided2 days100
BrailleBot

Things used in this project

Hardware components

DFRobot Romeo ESP32-S3 Development Board
×1
DFRobot Servo Motors
×1
DFPlayer - A Mini MP3 Player
DFRobot DFPlayer - A Mini MP3 Player
×1
Memory Card
×1
DFRobot Speaker
×1
Jumper Wire Set
×1
Screws
×1
Touch Sensor
×1

Software apps and online services

Arduino IDE
Arduino IDE
Fusion 360
Autodesk Fusion 360

Hand tools and fabrication machines

Screwdriver Set
3D Printer

Story

Read more

Custom parts and enclosures

Main Body

Top

Dot1

Dot2

Schematics

Circuit Connection

Code

Initialize

Arduino
/*  makerbrains.com
    Mukesh Sankhla
    @mukesh.diy     */
    
#include <Servo.h>

Servo myservo = Servo();

const int servo1 = 4;
const int servo2 = 5;
const int servo3 = 6;
const int servo4 = 7;
const int servo5 = 15;
const int servo6 = 16;

void setup() {

  for (int pos = 180; pos >= 0; pos--) {  // go from 180-0 degrees
    myservo.write(servo1, pos);       
    delay(15);
  }
  for (int pos = 0; pos <= 180; pos++) {  // go from 180-0 degrees
    myservo.write(servo1, pos);        
    delay(15);
  }

  for (int pos = 0; pos <= 180; pos++) {  // go from 180-0 degrees
    myservo.write(servo2, pos);        
    delay(15);
  }
  for (int pos = 180; pos >= 0; pos--) {  // go from 180-0 degrees
    myservo.write(servo2, pos);       
    delay(15);
  }

  for (int pos = 180; pos >= 0; pos--) {  // go from 180-0 degrees
    myservo.write(servo3, pos);       
    delay(15);
  }
  for (int pos = 0; pos <= 180; pos++) {  // go from 180-0 degrees
    myservo.write(servo3, pos);        
    delay(15);
  }

  for (int pos = 0; pos <= 180; pos++) {  // go from 180-0 degrees
    myservo.write(servo4, pos);        
    delay(15);
  }
  for (int pos = 180; pos >= 0; pos--) {  // go from 180-0 degrees
    myservo.write(servo4, pos);       
    delay(15);
  }

  for (int pos = 180; pos >= 0; pos--) {  // go from 180-0 degrees
    myservo.write(servo5, pos);       
    delay(15);
  }
  for (int pos = 0; pos <= 180; pos++) {  // go from 180-0 degrees
    myservo.write(servo5, pos);        
    delay(15);
  }

  for (int pos = 0; pos <= 180; pos++) {  // go from 180-0 degrees
    myservo.write(servo6, pos);        
    delay(15);
  }
  for (int pos = 180; pos >= 0; pos--) {  // go from 180-0 degrees
    myservo.write(servo6, pos);       
    delay(15);
  }
}

void loop() {
}

BrailleBot

Arduino
/*
   Project  :  BrailleBot
   Author   :  Mukesh Sankhla
   Website  :  makerbrains.com
*/

#include <Servo.h>
#include "Arduino.h"
#include "DFRobotDFPlayerMini.h"

#define FPSerial Serial1

// The delay of 2sec for the action to complete
#define pause 2000

// Pin assignments for "Next" and "Previous" buttons
const int nextPin = 45;
const int previousPin = 8;

// Flags to detect button presses
volatile bool nextPressed = false;
volatile bool previousPressed = false;

int position = 0;  // Current Braille alphabet position

// Servo motor assignments for Braille dots
Servo myservo = Servo();
const int servo1 = 4;
const int servo2 = 5;
const int servo3 = 6;
const int servo4 = 7;
const int servo5 = 15;
const int servo6 = 16;

// Declaration of the DFPlayer instance
DFRobotDFPlayerMini myDFPlayer;

void setup() {
  pinMode(nextPin, INPUT_PULLUP);
  pinMode(previousPin, INPUT_PULLUP);

  // Set up serial communication
  FPSerial.begin(9600, SERIAL_8N1, /*rx =*/48, /*tx =*/46);
  Serial.begin(115200);

  // Display welcome message
  Serial.println(F("Hello! I am BrailleBot."));

  // Attach interrupts for button presses
  attachInterrupt(digitalPinToInterrupt(nextPin), nextISR, FALLING);
  attachInterrupt(digitalPinToInterrupt(previousPin), previousISR, FALLING);

  // Initialize the DFPlayer module
  if (!myDFPlayer.begin(FPSerial, /*isACK = */true, /*doReset = */true)) {
    Serial.println(F("Unable to begin:"));
    Serial.println(F("1. Please recheck the connection!"));
    Serial.println(F("2. Please insert the SD card!"));
  }

  // Display start message
  Serial.println(F("Let's Start Learning."));

  // Clear Braille display and play introduction audio
  clear();
  delay(1000);
  myDFPlayer.volume(30);
  myDFPlayer.play(27);
  delay(4000);

  // Perform initial setup by moving Braille dots up and down
  for(int i = 0; i < 5; i++){
    up();
    clear();
  }
  play();  // Play the audio for the current Braille letter
}

// Main loop
void loop() {
  // Check if "Next" button is pressed
  if (nextPressed) {
    position++;
    clear();
    play();  // Play the audio for the new Braille letter
    nextPressed = false;  // Reset the flag
  }

  // Check if "Previous" button is pressed
  if (previousPressed) {
    position--;
    clear();
    play();  // Play the audio for the new Braille letter
    previousPressed = false;  // Reset the flag
  }
}

// Functions to move each Braille dot up and down
void dot1Up(){
  for (int pos = 180; pos >= 162; pos--) {
    myservo.write(servo1, pos);  
    delay(5);
  }
}
void dot1Down(){
  for (int pos = 162; pos <= 180; pos++) {
    myservo.write(servo1, pos);  
    delay(5);
  }
}

void dot2Up(){
  for (int pos = 0; pos <= 20; pos++) {
    myservo.write(servo2, pos);  
    delay(5);
  }
}
void dot2Down(){
  for (int pos = 20; pos >= 0; pos--) {
    myservo.write(servo2, pos);  
    delay(5);
  }
}

void dot3Up(){
  for (int pos = 180; pos >= 165; pos--) {
    myservo.write(servo3, pos);  
    delay(5);
  }
}
void dot3Down(){
  for (int pos = 165; pos <= 180; pos++) {
    myservo.write(servo3, pos);  
    delay(5);
  }
}

void dot4Up(){
  for (int pos = 0; pos <= 16; pos++) {
    myservo.write(servo4, pos);  
    delay(5);
  }
}
void dot4Down(){
  for (int pos = 16; pos >= 0; pos--) {
    myservo.write(servo4, pos);  
    delay(5);
  }
}

void dot5Up(){
  for (int pos = 180; pos >= 160; pos--) {
    myservo.write(servo5, pos);  
    delay(5);
  }
}
void dot5Down(){
  for (int pos = 160; pos <= 180; pos++) {
    myservo.write(servo5, pos);  
    delay(5);
  }
}

void dot6Up(){
  for (int pos = 0; pos <= 10; pos++) {
    myservo.write(servo6, pos);  
    delay(5);
  }
}
void dot6Down(){
  for (int pos = 10; pos >= 0; pos--) {
    myservo.write(servo6, pos);  
    delay(5);
  }
}


// Function to play audio and move Braille dots for each letter
void play(){  
    if(position == 0){
      position = 1;
    }
    if(position == 1){
      a();
    }
    if(position == 2){
      b();
    }
    if(position == 3){
      c();
    }
    if(position == 4){
      d();
    }
    if(position == 5){
      e();
    }
    if(position == 6){
      f();
    }
    if(position == 7){
      g();
    }
    if(position == 8){
      h();
    }
    if(position == 9){
      i();
    }
    if(position == 10){
      j();
    }
    if(position == 11){
      k();
    }
    if(position == 12){
      l();
    }
    if(position == 13){
      m();
    }
    if(position == 14){
      n();
    }
    if(position == 15){
      o();
    }
    if(position == 16){
      p();
    }
    if(position == 17){
      q();
    }
    if(position == 18){
      r();
    }
    if(position == 19){
      s();
    }
    if(position == 20){
      t();
    }
    if(position == 21){
      u();
    }
    if(position == 22){
      v();
    }
    if(position == 23){
      w();
    }
    if(position == 24){
      x();
    }
    if(position == 25){
      y();
    }
    if(position == 26){
      z();
    }
    if(position == 27){
      position = 1;
    }
  }

// Function to clear Braille display by moving all dots down
void clear(){
  dot1Down();
  delay(100);
  dot2Down();
  delay(100);
  dot3Down();
  delay(100);
  dot4Down();
  delay(100);
  dot5Down();
  delay(100);
  dot6Down();
  delay(100);
}

// Functions for each Braille letter from A to Z
void a(){
  dot1Up();
  myDFPlayer.play(2);
  delay(pause);
}

void b(){
  dot1Up();
  dot3Up();
  myDFPlayer.play(3);
  delay(pause);
}

void c(){
  dot1Up();
  dot2Up();
  myDFPlayer.play(4);
  delay(pause);
}

void d(){
  dot1Up();
  dot2Up();
  dot4Up();
  myDFPlayer.play(5);
  delay(pause);
}

void e(){
  dot1Up();
  dot4Up();
  myDFPlayer.play(6);
  delay(pause);
}

void f(){
  dot1Up();
  dot2Up();
  dot3Up();
  myDFPlayer.play(7);
  delay(pause);
}

void g(){
  dot1Up();
  dot2Up();
  dot3Up();
  dot4Up();
  myDFPlayer.play(8);
  delay(pause);
}

void h(){
  dot1Up();
  dot3Up();
  dot4Up();
  myDFPlayer.play(9);
  delay(pause);
}

void i(){
  dot2Up();
  dot3Up();
  myDFPlayer.play(10);
  delay(pause);
}

void j(){
  dot2Up();
  dot3Up();
  dot4Up();
  myDFPlayer.play(11);
  delay(pause);
}

void k(){
  dot1Up();
  dot5Up();
  myDFPlayer.play(12);
  delay(pause);
}

void l(){
  dot1Up();
  dot3Up();
  dot5Up();
  myDFPlayer.play(13);
  delay(pause);
}

void m(){
  dot1Up();
  dot2Up();
  dot5Up();
  myDFPlayer.play(14);
  delay(pause);
}

void n(){
  dot1Up();
  dot2Up();
  dot4Up();
  dot5Up();
  myDFPlayer.play(15);
  delay(pause);
}

void o(){
  dot1Up();
  dot4Up();
  dot5Up();
  myDFPlayer.play(16);
  delay(pause);
}

void p(){
  dot1Up();
  dot2Up();
  dot3Up();
  dot5Up();
  myDFPlayer.play(17);
  delay(pause);
}

void q(){
  dot1Up();
  dot2Up();
  dot3Up();
  dot4Up();
  dot5Up();
  myDFPlayer.play(18);
  delay(pause);
}

void r(){
  dot1Up();
  dot3Up();
  dot4Up();
  dot5Up();
  myDFPlayer.play(19);
  delay(pause);
}

void s(){
  dot2Up();
  dot3Up();
  dot5Up();
  myDFPlayer.play(20);
  delay(pause);
}

void t(){
  dot2Up();
  dot3Up();
  dot4Up();
  dot5Up();
  myDFPlayer.play(21);
  delay(pause);
}

void u(){
  dot1Up();
  dot5Up();
  dot6Up();
  myDFPlayer.play(22);
  delay(pause);
}

void v(){
  dot1Up();
  dot3Up();
  dot5Up();
  dot6Up();
  myDFPlayer.play(23);
  delay(pause);
}

void w(){
  dot2Up();
  dot3Up();
  dot4Up();
  dot6Up();
  myDFPlayer.play(24);
  delay(pause);
}

void x(){
  dot1Up();
  dot2Up();
  dot5Up();
  dot6Up();
  myDFPlayer.play(25);
  delay(pause);
}

void y(){
  dot1Up();
  dot2Up();
  dot4Up();
  dot5Up();
  dot6Up();
  myDFPlayer.play(26);
  delay(pause);
}

void z(){
  dot1Up();
  dot4Up();
  dot5Up();
  dot6Up();
  myDFPlayer.play(1);
  delay(pause);
}

// Function to move all Braille dots up
void up(){
  dot1Up();
  dot2Up();
  dot3Up();
  dot4Up();
  dot5Up();
  dot6Up();
}

// Interrupt service routine for "Next" button
void nextISR() {
  nextPressed = true;
}

// Interrupt service routine for "Previous" button
void previousISR() {
  previousPressed = true;
}

Credits

Mukesh Sankhla

Mukesh Sankhla

23 projects • 34 followers
🧑‍💻Passionate software engineer at Siemens, dedicated to driving digitalization by day.🧑‍🏭By night, I'm a Maker.

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