Sending the messages to the Arduino board as integers instead of strings.
lucidcode
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lucidcode 
Hi
I am a student and I have a project for the Science of the Engineer section.
In this project i use Arduino for receiving data from the headset Mindwave.
Here is my problem:
I’d like to use the eye blinking signal to control a servo motor but I can not get this data !
I already have a working program, but uses the attention …
Thank you for your help !
Can you access the raw EEG data? If it spikes; it is probably a blink. What code are you using to receive the attention data?
thanx for reply 🙂
no, i cant accces raw EEG data !
i’m using that code :
///////////////////////////////////////////////////////////////
// Arduino Bluetooth Interface with Mindwave
////////////////////////////////////////////////////////////////////////
#include // library for software serial
SoftwareSerial mySerial(5, 6); // RX, TX
int LED = 8; // yellow one
int LED1 = 7; //white one
int BAUDRATE = 57600;
// checksum variables
byte payloadChecksum = 0;
byte CalculatedChecksum;
byte checksum = 0; //data type byte stores an 8-bit unsigned number, from 0 to 255
int payloadLength = 0;
byte payloadData[64] = {0};
byte poorQuality = 0;
byte attention = 0;
byte meditation = 0;
// system variables
long lastReceivedPacket = 0;
boolean bigPacket = false;
boolean brainwave = false;
void setup() {
pinMode(LED, OUTPUT);
pinMode(LED1, OUTPUT);
digitalWrite(LED, HIGH); // hello sequence
delay(100);
digitalWrite(LED, LOW);
delay(100);
Serial.begin(57600); // Bluetooth
delay(500);
mySerial.begin(4800); // software serial
delay(500);
mySerial.print(“Communicating… “);
mySerial.println();
}
byte ReadOneByte() {
int ByteRead;
// Wait until there is data
while(!Serial.available());
//Get the number of bytes (characters) available for reading from the serial port.
//This is data that’s already arrived and stored in the serial receive buffer (which holds 64 bytes)
ByteRead = Serial.read();
return ByteRead; // read incoming serial data
}
unsigned int delta_wave = 0;
unsigned int theta_wave = 0;
unsigned int low_alpha_wave = 0;
unsigned int high_alpha_wave = 0;
unsigned int low_beta_wave = 0;
unsigned int high_beta_wave = 0;
unsigned int low_gamma_wave = 0;
unsigned int mid_gamma_wave = 0;
void read_waves(int i) {
delta_wave = read_3byte_int(i);
i+=3;
theta_wave = read_3byte_int(i);
i+=3;
low_alpha_wave = read_3byte_int(i);
i+=3;
high_alpha_wave = read_3byte_int(i);
i+=3;
low_beta_wave = read_3byte_int(i);
i+=3;
high_beta_wave = read_3byte_int(i);
i+=3;
low_gamma_wave = read_3byte_int(i);
i+=3;
mid_gamma_wave = read_3byte_int(i);
}
int read_3byte_int(int i) {
return ((payloadData[i] << 16) + (payloadData[i+1] < 169) //Payload length can not be greater than 169
return;
payloadChecksum = 0;
for(int i = 0; i < payloadLength; i++) { //loop until payload length is complete
payloadData[i] = ReadOneByte(); //Read payload
payloadChecksum += payloadData[i];
}
checksum = ReadOneByte(); //Read checksum byte from stream
payloadChecksum = 255 – payloadChecksum; //Take one’s compliment of generated checksum
if(checksum == payloadChecksum) {
poorQuality = 200;
attention = 0;
meditation = 0;
}
brainwave = false;
for(int i = 0; i 0 && attention 40){
digitalWrite(LED1, HIGH);
}
else
digitalWrite(LED1, LOW);
}
}
}
Thanks, I am amazed how much you are doing to help out and it is very much appreciated
Still not working but I found out why and not to do with integers. Partly my fault as it has to do with the complementary program (sketch) I have to load into the arduino, i.e. when Lucidscribe sends it info, matching baudrate etc.
In your code if you could use the syntax
arduino->WriteLine(“1”); // send 1 to arduino
arduino->WriteLine(“0”); // send 0 to arduino
instead of arduinoPort.Write, my sketch in arduino will work
There is a good simple example on this website, that I tested and it works
http://webtutsdepot.com/2010/05/01/arduino-visual-c-plus-plus-tutorial/
Sure. And thanks for your help and patience with the testing: ThinkGear EEG 1.1.3 now sends the NewLine character at the end of the message… third time lucky?