Serial Data from EMG Shield

[TiltSwitch]

I have the Demo sketch loaded to the OLIMEXINO-STM32 with one EMG shield on it. When I can get ElectricGuru to run it shows muscle activities, but when I monitor the serial port I get data that looks like this:

¥Z
Ä
Ë#+
¥Z
ò
Ò53PT
¥Z

Ð
Ú
ô
õ
÷
ñ
¥Z
´
Р  
÷
ì
¥Z
É
È

ø
¥Z
÷
Î;>_b
¥Z
æ
Û
ý
ç
ø
¥Z
³
Ô
ó

é
¥Z
À
Í
ü
õ
¥Z
ä
ÍAEki
¥Z
ë
Ù   
ó
þ
¥Z
µ
Ó
å

â
¥Z
½
Ì
ô
ð
¥Z
Ô
Ì<<e_
¥Z
á
Ø
¥Z
®
Ø
ý
þ
Ý
¥Z
È
Í

ú
ë
¥Z
ä
È67WN
¥Z
ú
Õ"++
¥Z
½
Ô
÷
ø

Can you offer me any advice as to settings I may have wrong or how to read this data? Thanks in advance.

[LubOlimex]

Probably the baud rate isn't correct. What bauds have you tried?

Best regards,
Lub/OLIMEX

[TiltSwitch]

Tried Several, currently set to 57600 baud. With current settings serial data looks like

¥Z

þ,


¥Zž
ˆ
ö-   
¥ZŸ
 
ï!
û
î
¥Z 
ù
¥Z¡

þ2
¥Z¢
˜
ÿ:
¥Z£

ñ&
ý
ð
¥Z¤
ý*#   

÷
¥Z¥

ö
¥Z¦
¼   
¥Z§
Œ
ð
ø
ô
¥Z¨
ó$

ô
¥Z©


þ$
¥Zª
Þ&&
¥Z«

ú
ü
þ
¥Z¬
é$
þ,
¥Z­

ý4   
¥Z®
Ô-
¥Z¯
q
ê
ü)
¥Z°
Ç
õ(
ÿ
¥Z±

û3
¥Z²
ø*,
¥Z³
‡
ÿ!

¥Z´
ª
ü"
ù
ö
¥Zµ

Any suggestions about what settings I should use? Thanks for your help.

[LubOlimex]

Hey TilitSwitch,

Yes, 57600 is the correct baud but the data format is not the standard UART packet. That is why the data seems coded it follows http://openeeg.sourceforge.net/doc/modeeg/firmware/modeeg-p2.c. You will need to write a packet decryptor and translator to receive meaningful characters.

There is such decryptor in every software suggested (ElecGuru, BrainBay, etc).

Best regards,
Lub/OLIMEX

[olimex]

Tried Several, currently set to 57600 baud. With current settings serial data looks like

¥Z

þ,


¥Zž
ˆ
ö-   
¥ZŸ

ï!
û
î
¥Z 
ù
¥Z¡

þ2
¥Z¢
˜
ÿ:
¥Z£

ñ&
ý
ð
¥Z¤
ý*#   

÷
¥Z¥

ö
¥Z¦
¼   
¥Z§
Œ
ð
ø
ô
¥Z¨
ó$

ô
¥Z©


þ$
¥Zª
Þ&&
¥Z«

ú
ü
þ
¥Z¬
é$
þ,
¥Z­

ý4   
¥Z®
Ô-
¥Z¯
q
ê
ü)
¥Z°
Ç
õ(
ÿ
¥Z±

û3
¥Z²
ø*,
¥Z³
‡
ÿ!

¥Z´
ª
ü"
ù
ö
¥Zµ

Any suggestions about what settings I should use? Thanks for your help.

you should not see ASCII symbols as these are ADC readings in 0-255 range

[TiltSwitch]

I appreciate your responses, I think I am going at this the wrong way. What I really need is to monitor the analog data for two shields which would represent flexion and extension of the wrist. Can I simply read the values of the Analog pins (A0 and A1) and use a processing program to make decisions based on the data? I tried using

/*
  AnalogReadSerial
  Reads an analog input on pin 0, prints the result to the serial monitor.
  Attach the center pin of a potentiometer to pin A0, and the outside pins to +5V and ground.

This example code is in the public domain.
*/

// the setup routine runs once when you press reset:
void setup() {
  // initialize serial communication at 57600 bits per second:
  Serial.begin(57600);
}

// the loop routine runs over and over again forever:
void loop() {
  // read the input on analog pin 0:
  int sensorValue = analogRead(A0);
  // print out the value you read:
  Serial.println(sensorValue);
  delay(1000);        // delay in between reads for stability
}

To read the Analog Pin and I get data but I get no change in the data when muscles are flexing under the electrodes.
Thank you for your help.

[olimex]

the shields have jumpers which have to be selected correctly to may connect to different analog inputs
make sure you have connected your shields correctly