Tony
Published © GPL3+

Brainwaves Fly a Drone

Drones are fun to fly, and it’s possible to do limited flying using brainwaves.

IntermediateFull instructions provided4 hours13,121
Brainwaves Fly a Drone

Things used in this project

Hardware components

NeuroSky MindWave Mobile 2 headset
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Arduino UNO Wifi Rev.2
Arduino UNO Wifi Rev.2
Complete list of all parts is in the Story section.
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Story

Read more

Code

Bluetooth_Serial_AT_Command_mode.ino

Arduino
#include<SoftwareSerial.h>
SoftwareSerial BT(10,11);
void setup()
{
  pinMode(9,OUTPUT);
  digitalWrite(9,HIGH);
  Serial.begin(38400);
  BT.begin(38400);
  Serial.println("Bluetooth AT command mode");
}
void loop()
{
  if(BT.available())
    Serial.write(BT.read());
    
  if(Serial.available())
    BT.write(Serial.read());
}

drone.ino

Arduino
/*
When the brains Attention is high, this code will move a servo attached to the 
throttle joystick of a drone controller and turn 2 LEDs on. December 26, 2020.
     Yellow LED on when Attention is more than 50
     Green LED on when Attention is more than 70
     Servo moves to position set by potentiometer (between 0 and 30 degrees)

Hardware: Arduino with HC-05 Bluetooth and NeuroSky MindWave Mobile 2 
*/ 

#include<Servo.h>
#define BAUDRATE 57600
#define YLED 4
#define GLED 2

//////////    Variables 
Servo myservo;  
byte payloadData[32] = {0};
byte Attention=0; 
byte checksum=0;
byte generatedchecksum=0;
int  Plength;
int val;            // variable to read the value from the analog pin
int val2;           // variable to hold temporary value for gradual ascent
int countup = 0;    // counter for steps in gradual ascent
int potpin = 0;     // analog pin used to connect the potentiometer

//////////    Arduino setup
void setup() {
  Serial.begin(BAUDRATE);   // baud rate for the MindWave
  pinMode(YLED, OUTPUT);    // initialize the LED pins as output
  pinMode(GLED, OUTPUT);
  Serial.println("Attention Values");  // display title in Serial Monitor
  myservo.attach(9);      // attach the servo on pin 9 to the servo object
  myservo.write(0);       // move the servo to 0 degrees
  delay(15);              // give the servo time to move there
}

//////////    Read data from the MindWave
byte ReadOneByte()
{
  int ByteRead;
  while(!Serial.available());
  ByteRead = Serial.read();
  return ByteRead;
}

//////////    Main program
void loop() 
{

//////    Look for sync bytes and read data from the MindWave
  while (1)
  {
    if(ReadOneByte() == 170) 
    {
      if(ReadOneByte() == 170) 
      {
        Plength = ReadOneByte();
        if(Plength == 32) 
        {
          generatedchecksum = 0;
          for(int i = 0; i < Plength; i++) 
          {  
            payloadData[i]     = ReadOneByte();        //Read payload into memory
            generatedchecksum  += payloadData[i] ;
          }
          generatedchecksum = 255 - generatedchecksum;
          checksum  = ReadOneByte();

//////    Obtain Attention data and display it in the Serial Monito
          if(checksum == generatedchecksum) 
          {             
            if (payloadData[28]==4)
            { 
                 Attention = payloadData[29];
                 Serial.println(Attention, DEC);

//////    Light LEDs and move the servo
                 if (Attention>50)
                 {
                 digitalWrite(YLED, HIGH);     // turn yellow LED on
             val = analogRead(potpin);         // read the value of the potentiometer 
                                               // (value between 0 and 1023)
                   // The potentiometer adjusts the maximum throttle. With a fully 
                   // charged drone battery, the potentiometer should be at its 
                   // mid-point. As the drones battery is being used up, the
                   // potentiometer should be turned higher.
             val = map(val, 0, 1023, 0, 30);   // scale it to use it with the servo 
                                               // (value between 0 and 30)
                    // This makes the servo move a maximum of 30 degrees. My
                    // throttle joystick doesnt allow any more movement than that.

          //// gradual ascent, slowly increasing the throttle
    if (countup == 0) {                
    countup = 1;                    // First, set throttle to 30% for 0.3 seconds
    val2 = val*0.3;
    myservo.write(val2);
    delay(300);
    }
    else {
       if (countup == 1) {
       countup = 2;                  // Now, set throttle to 50% for 0.3 seconds
       val2 = val*0.5;
       myservo.write(val2);
       delay(300);
       }
       else {
          if (countup == 2) {
          countup = 3;               // Then, set throttle to 70% for 0.3 seconds
          val2 = val*0.7;
          myservo.write(val2);
          delay(300);
           }
           else {
              if (countup == 3) {
              myservo.write(val);     // Finally, set throttle to 100%
              delay(15);
               }
               else{
               }
            }
        }
     }
  } 
else {
digitalWrite(YLED, LOW);         // turn yellow LED off if Attention is 50 or lower
countup = 0;                     // reset the counter
myservo.write(0);                // set throttle to 0
delay(15);
}
                 if(Attention>70)     // turn green LED on if Attention is over 70
                 {
                 digitalWrite(GLED, HIGH);
                 }
                 else                 // turn green LED off if Attention is 70 or lower
                 {
                 digitalWrite(GLED, LOW);
                 }
               }
             }
           } 
         }
       }
     }         
}

Credits

Tony

Tony

9 projects • 23 followers
Now retired, I'm making gadgets and robots. I used to enjoy electronics using vacuum tubes and then transistors when they became available.

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