Programming error with Neurosky Mindwave Headset

Projects Programming
1

Hey guys,
I'm trying to use a Neurosky Mindwave Mobile headset to control a bunch of LED's along with a servo motor, using an arduino mega 2560 and the bluesmirf gold. I've put LED's into the correct pins, and none of them are lighting up, even though the headset and bluesmirf are connected correctly. I've looked into the developer website with the example code (http://developer.neurosky.com/docs/doku.php?id=mindwave_mobile_and_arduino) and I don't have access to an LED array. My questions are:
What is the most likely cause of the issue?
Has anyone had any experience with the Neurosky mindwave mobile headset, if so could you let me know how you did your project?

Thanks

2

What is the most likely cause of the issue?

User error.

You posted no code. You posted no schematic. Sounds like user error to me.

3

This is the schematic:

817×424 30.3 KB

And this is the code:

void loop() {


  // Look for sync bytes
  if(ReadOneByte() == 170) {
    if(ReadOneByte() == 170) {

      payloadLength = ReadOneByte();
      if(payloadLength > 169)                      //Payload length can not be greater than 169
          return;

      generatedChecksum = 0;        
      for(int i = 0; i < payloadLength; i++) {  
        payloadData[i] = ReadOneByte();            //Read payload into memory
        generatedChecksum += payloadData[i];
      }   

      checksum = ReadOneByte();                      //Read checksum byte from stream      
      generatedChecksum = 255 - generatedChecksum;   //Take one's compliment of generated checksum

        if(checksum == generatedChecksum) {    

        poorQuality = 200;
        attention = 0;
        meditation = 0;

        for(int i = 0; i < payloadLength; i++) {    // Parse the payload
          switch (payloadData[i]) {
          case 2:
            i++;            
            poorQuality = payloadData[i];
            bigPacket = true;            
            break;
          case 4:
            i++;
            attention = payloadData[i];                        
            break;
          case 5:
            i++;
            meditation = payloadData[i];
            break;
          case 0x80:
            i = i + 3;
            break;
          case 0x83:
            i = i + 25;      
            break;
          default:
            break;
          } // switch
        } // for loop

#if !DEBUGOUTPUT

        // *** Add your code here ***

        if(bigPacket) {
          if(poorQuality == 0)
            digitalWrite(LED, HIGH);
          else
            digitalWrite(LED, LOW);
          Serial.print("PoorQuality: ");
          Serial.print(poorQuality, DEC);
          Serial.print(" Attention: ");
          Serial.print(attention, DEC);
          Serial.print(" Time since last packet: ");
          Serial.print(millis() - lastReceivedPacket, DEC);
          lastReceivedPacket = millis();
          Serial.print("\n");

          switch(attention / 10) {
          case 0:
            digitalWrite(GREENLED1, HIGH);
            digitalWrite(GREENLED2, LOW);
            digitalWrite(GREENLED3, LOW);
            digitalWrite(YELLOWLED1, LOW);
            digitalWrite(YELLOWLED2, LOW);
            digitalWrite(YELLOWLED3, LOW);
            digitalWrite(YELLOWLED4, LOW);
            digitalWrite(REDLED1, LOW);
            digitalWrite(REDLED2, LOW);
            digitalWrite(REDLED3, LOW);           
            break;
          case 1:
            digitalWrite(GREENLED1, HIGH);
            digitalWrite(GREENLED2, HIGH);
            digitalWrite(GREENLED3, LOW);
            digitalWrite(YELLOWLED1, LOW);
            digitalWrite(YELLOWLED2, LOW);
            digitalWrite(YELLOWLED3, LOW);
            digitalWrite(YELLOWLED4, LOW);
            digitalWrite(REDLED1, LOW);
            digitalWrite(REDLED2, LOW);
            digitalWrite(REDLED3, LOW);
            break;
          case 2:
            digitalWrite(GREENLED1, HIGH);
            digitalWrite(GREENLED2, HIGH);
            digitalWrite(GREENLED3, HIGH);
            digitalWrite(YELLOWLED1, LOW);
            digitalWrite(YELLOWLED2, LOW);
            digitalWrite(YELLOWLED3, LOW);
            digitalWrite(YELLOWLED4, LOW);
            digitalWrite(REDLED1, LOW);
            digitalWrite(REDLED2, LOW);
            digitalWrite(REDLED3, LOW);
            break;
          case 3:              
            digitalWrite(GREENLED1, HIGH);
            digitalWrite(GREENLED2, HIGH);
            digitalWrite(GREENLED3, HIGH);              
            digitalWrite(YELLOWLED1, HIGH);
            digitalWrite(YELLOWLED2, LOW);
            digitalWrite(YELLOWLED3, LOW);
            digitalWrite(YELLOWLED4, LOW);
            digitalWrite(REDLED1, LOW);
            digitalWrite(REDLED2, LOW);
            digitalWrite(REDLED3, LOW);             
            break;
          case 4:
            digitalWrite(GREENLED1, HIGH);
            digitalWrite(GREENLED2, HIGH);
            digitalWrite(GREENLED3, HIGH);              
            digitalWrite(YELLOWLED1, HIGH);
            digitalWrite(YELLOWLED2, HIGH);
            digitalWrite(YELLOWLED3, LOW);
            digitalWrite(YELLOWLED4, LOW);
            digitalWrite(REDLED1, LOW);
            digitalWrite(REDLED2, LOW);
            digitalWrite(REDLED3, LOW);              
            break;
          case 5:
            digitalWrite(GREENLED1, HIGH);
            digitalWrite(GREENLED2, HIGH);
            digitalWrite(GREENLED3, HIGH);              
            digitalWrite(YELLOWLED1, HIGH);
            digitalWrite(YELLOWLED2, HIGH);
            digitalWrite(YELLOWLED3, HIGH);
            digitalWrite(YELLOWLED4, LOW);
            digitalWrite(REDLED1, LOW);
            digitalWrite(REDLED2, LOW);
            digitalWrite(REDLED3, LOW);               
            break;
          case 6:              
            digitalWrite(GREENLED1, HIGH);
            digitalWrite(GREENLED2, HIGH);
            digitalWrite(GREENLED3, HIGH);              
            digitalWrite(YELLOWLED1, HIGH);
            digitalWrite(YELLOWLED2, HIGH);
            digitalWrite(YELLOWLED3, HIGH);
            digitalWrite(YELLOWLED4, HIGH);
            digitalWrite(REDLED1, LOW);
            digitalWrite(REDLED2, LOW);
            digitalWrite(REDLED3, LOW);              
            break;
          case 7:
            digitalWrite(GREENLED1, HIGH);
            digitalWrite(GREENLED2, HIGH);
            digitalWrite(GREENLED3, HIGH);              
            digitalWrite(YELLOWLED1, HIGH);
            digitalWrite(YELLOWLED2, HIGH);
            digitalWrite(YELLOWLED3, HIGH);
            digitalWrite(YELLOWLED4, HIGH);
            digitalWrite(REDLED1, HIGH);
            digitalWrite(REDLED2, LOW);
            digitalWrite(REDLED3, LOW);              
            break;    
          case 8:
            digitalWrite(GREENLED1, HIGH);
            digitalWrite(GREENLED2, HIGH);
            digitalWrite(GREENLED3, HIGH);              
            digitalWrite(YELLOWLED1, HIGH);
            digitalWrite(YELLOWLED2, HIGH);
            digitalWrite(YELLOWLED3, HIGH);
            digitalWrite(YELLOWLED4, HIGH);
            digitalWrite(REDLED1, HIGH);
            digitalWrite(REDLED2, HIGH);
            digitalWrite(REDLED3, LOW);
            break;
          case 9:
            digitalWrite(GREENLED1, HIGH);
            digitalWrite(GREENLED2, HIGH);
            digitalWrite(GREENLED3, HIGH);              
            digitalWrite(YELLOWLED1, HIGH);
            digitalWrite(YELLOWLED2, HIGH);
            digitalWrite(YELLOWLED3, HIGH);
            digitalWrite(YELLOWLED4, HIGH);
            digitalWrite(REDLED1, HIGH);
            digitalWrite(REDLED2, HIGH); 
            digitalWrite(REDLED3, HIGH);
            break;
          case 10:
            digitalWrite(GREENLED1, HIGH);
            digitalWrite(GREENLED2, HIGH);
            digitalWrite(GREENLED3, HIGH);              
            digitalWrite(YELLOWLED1, HIGH);
            digitalWrite(YELLOWLED2, HIGH);
            digitalWrite(YELLOWLED3, HIGH);
            digitalWrite(YELLOWLED4, HIGH);
            digitalWrite(REDLED1, HIGH);
            digitalWrite(REDLED2, HIGH); 
            digitalWrite(REDLED3, HIGH);
            break;           
          }                     
        }
#endif        
        bigPacket = false;        
      }
      else {
        // Checksum Error
      }  // end if else for checksum
    } // end if read 0xAA byte
  } // end if read 0xAA byte
}

(Sorry for such the large amount; not sure where the problem could be?)

4

not sure where the problem could be?

But you are absolutely certain that it is not in the global variable declarations or setup. Well, good luck with that approach.

5

Here is the first part of the code (I couldn't include in the previous one because of the max. characters):

#define LED 13
#define BAUDRATE 57600
#define DEBUGOUTPUT 0

#define GREENLED1  3
#define GREENLED2  4
#define GREENLED3  5
#define YELLOWLED1 6
#define YELLOWLED2 7
#define YELLOWLED3 8
#define YELLOWLED4 9
#define REDLED1    10
#define REDLED2    11
#define REDLED3    12

#define powercontrol 10

// checksum variables
byte generatedChecksum = 0;
byte checksum = 0; 
int payloadLength = 0;
byte payloadData[64] = {
  0};
byte poorQuality = 0;
byte attention = 0;
byte meditation = 0;

// system variables
long lastReceivedPacket = 0;
boolean bigPacket = false;

//////////////////////////
// Microprocessor Setup //
//////////////////////////
void setup() {

  pinMode(GREENLED1, OUTPUT);
  pinMode(GREENLED2, OUTPUT);
  pinMode(GREENLED3, OUTPUT);
  pinMode(YELLOWLED1, OUTPUT);
  pinMode(YELLOWLED2, OUTPUT);
  pinMode(YELLOWLED3, OUTPUT);
  pinMode(YELLOWLED4, OUTPUT);
  pinMode(REDLED1, OUTPUT);
  pinMode(REDLED2, OUTPUT);
  pinMode(REDLED3, OUTPUT);

  pinMode(LED, OUTPUT);
  Serial.begin(BAUDRATE);           // USB

}
6

You need to post ALL of your code. If it is too large to fit in one post, then use the Additional Options link below to attach the code.

But, before you do that, ask yourself what problem you are trying to solve. Are you trying to debug the bluetooth part? If so, then disconnect the other hardware, and write a simple sketch that just deals with the bluetooth device. If it isn't the bluetooth part you are having problems with, put the stupid thing in a drawer, connect a USB cable, and use Serial to send debug information to the PC.

Forget about all the LEDs (and the code to drive them).

If it's the LEDs that are the problem, disconnect the rest of the hardware and write code to drive them until you KNOW that they work.

7

I've attached all the code (thanks for the help).
Ok thank you very much for your advice, I'll do what you have recommended.

Have you ever worked with the neurosky headset?

Mindwave_Mobile_LED_Array.ino (9.09 KB)

8

Have you ever worked with the neurosky headset?

Nope. But, I am a professional programmer, so I know how to break problems down into solvable chunks. There are plenty of hardware gurus here, too, if it becomes apparent that you have a hardware problem.

9

Ok thank you very much Paul for your advice.
Are there any resources you recommend for more advanced arduino programming?

10

i have the same problem.
so do you solve them?

11

I would hazard a guess, and it is exactly that- a guess- that the most likely cause of LEDs not working is that they're connected back asswards.