Difference between revisions of "ButtonBoxes"

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The buttonbox is used for time accurate(1ms) button press registration. We use it to register buttonpresses, soundkey, voicekey signals and to send tone onset, analog output, triggers with the BITSI protocol. It is suitable for Behavioral, EEG, MEG, and fMRI experiments. The buttonbox is connected to a computer with a usb connection.
 
The buttonbox is used for time accurate(1ms) button press registration. We use it to register buttonpresses, soundkey, voicekey signals and to send tone onset, analog output, triggers with the BITSI protocol. It is suitable for Behavioral, EEG, MEG, and fMRI experiments. The buttonbox is connected to a computer with a usb connection.
  
The output connector has two binary eight bit ports: input and output. The two ports can be used for responses (input) and stimulus triggers (output). Two 8 bits analog outputs and three 8 bits analog inputs. The output connector has a sound and voicekey which triggers when a amplitude reaches a threshold. By using the serial port, the BITSI can be used platform independently: it works on Windows, Linux and Mac OSX. Most programming environments and stimulus packages support serial communication. 
+
The output connector has two binary eight bit ports: input and output. The two ports can be used for responses (input) and stimulus triggers (output). Two 8 bits analog outputs and three 8 bits analog inputs. The output connector has a sound and voicekey which triggers when a amplitude reaches a threshold. By using the serial port, the BITSI can be used platform independently: it works on Windows, Linux and Mac OSX. Most programming environments and stimulus packages support serial communication.
  
 
== BITSI Protocol ==
 
== BITSI Protocol ==
  
BITSI stands for Bits to Serial Interface. Because the BITSI is designed to interface both in- and output signals, the 'protocol' is asymmetric: the input and output protocols differ. 
+
BITSI stands for Bits to Serial Interface. Because the BITSI is designed to interface both in- and output signals, the 'protocol' is asymmetric: the input and output protocols differ.
  
<u>'''Input'''</u>
+
===Input===
  
 
The input port can be used to interface eight buttons maximally. Button presses are translated to serial output characters/bytes according to the following table:
 
The input port can be used to interface eight buttons maximally. Button presses are translated to serial output characters/bytes according to the following table:
  
{| border="1" cellspacing="0" cellpadding="0" width="462" style="width:462px;"
+
{| class="wikitable"  
 +
|-
 +
! scope="row" colspan="3" | BITSI Simple
 
|-
 
|-
 
+
! scope="row" width="120px" | Signal/Button
| style="colspan="3";" |  
+
! scope="row" width="120px" | ASCII (rise/fall)
'''BITSI Simple'''
+
! scope="row" width="120px" | Code (rise/fall)
 
+
|-
 +
| 1
 +
| A / a
 +
| 65 / 97
 
|-
 
|-
| style="width:113px;height:22px;" |
+
| 2
'''Signal / Button'''
+
| B / b
 
+
| 66 / 98
| style="width:170px;height:22px;" |  
 
'''ASCII''' (rising / falling)
 
 
 
| style="width:180px;height:22px;" |
 
'''Code''' (rising / falling)
 
 
 
 
|-
 
|-
| style="width:113px;height:22px;" |
+
| 3
1
+
| C / c
 
+
| 67 / 99
| style="width:170px;height:22px;" |
 
A / a
 
 
 
| style="width:180px;height:22px;" |  
 
65 / 97
 
 
 
 
|-
 
|-
| style="width:113px;height:22px;" |
+
| 4
2
+
| D / d
 
+
| 68 / 100
| style="width:170px;height:22px;" |
 
B / b
 
 
 
| style="width:180px;height:22px;" |  
 
66 / 98
 
 
 
 
|-
 
|-
| style="width:113px;height:22px;" |
+
| 5
3
+
| E / e
 
+
| 69 / 101
| style="width:170px;height:22px;" |
 
C / c
 
 
 
| style="width:180px;height:22px;" |  
 
67 / 99
 
 
 
 
|-
 
|-
| style="width:113px;height:22px;" |
+
| 6
4
+
| F / f
 
+
| 70 / 102
| style="width:170px;height:22px;" |
 
D / d
 
 
 
| style="width:180px;height:22px;" |  
 
68 / 100
 
 
 
 
|-
 
|-
| style="width:113px;height:22px;" |
+
| 7
5
+
| G / g
 
+
| 71 / 103
| style="width:170px;height:22px;" |
 
E / e
 
 
 
| style="width:180px;height:22px;" |  
 
69 / 101
 
 
 
 
|-
 
|-
| style="width:113px;height:22px;" |
+
| 1
6
+
| H / h
 
+
| 72 / 104
| style="width:170px;height:22px;" |
 
F / f
 
 
 
| style="width:180px;height:22px;" |  
 
70 / 102
 
 
 
 
|-
 
|-
| style="width:113px;height:22px;" |
+
| 1
7
+
| A / a
 
+
| 65 / 97
| style="width:170px;height:22px;" |
 
G / g
 
 
 
| style="width:180px;height:22px;" |  
 
71 / 103
 
 
 
 
|-
 
|-
| style="width:113px;height:22px;" |
+
| Soundkey
8
+
| S / s
 
+
| 83 / 115
| style="width:170px;height:22px;" |
 
H / h
 
 
 
| style="width:180px;height:22px;" |  
 
72 / 104
 
 
 
 
|-
 
|-
| style="width:113px;height:22px;" |
+
| Voicekey
SoundKey
+
| V / v
 
+
| 86 / 118
| style="width:170px;height:22px;" |
 
S / s
 
 
 
| style="width:180px;height:22px;" |  
 
83 / 115
 
 
 
 
|-
 
|-
| style="width:113px;height:22px;" |
 
VoiceKey
 
 
| style="width:170px;height:22px;" |
 
V / v
 
 
| style="width:180px;height:22px;" |
 
86 / 118
 
 
 
|}
 
|}
  
 
This means that when signal 1 gets active(button press), a capital A will be sent to the serial port. A lowercase 'a' will be sent when the signal is deactivated(button release). Mechanical buttons can be connected directly.
 
This means that when signal 1 gets active(button press), a capital A will be sent to the serial port. A lowercase 'a' will be sent when the signal is deactivated(button release). Mechanical buttons can be connected directly.
  
<u>'''Output'''</u>
+
===Output===
  
 
Output knows two protocols: '''BITSI simple''' or '''BITSI extended'''. To enter a certain protocol two buttons have to be pressed when the BITSIbox is powered. '''Press button H and A for simple mode and H and B for extended mode.'''
 
Output knows two protocols: '''BITSI simple''' or '''BITSI extended'''. To enter a certain protocol two buttons have to be pressed when the BITSIbox is powered. '''Press button H and A for simple mode and H and B for extended mode.'''
Line 141: Line 77:
 
The '''extended''' protocol uses two bytes(or two characters), this combination can access two analog outputs and a tone generator. The first byte selects the output. The second byte determines the value written to this output.
 
The '''extended''' protocol uses two bytes(or two characters), this combination can access two analog outputs and a tone generator. The first byte selects the output. The second byte determines the value written to this output.
  
 
+
{| class="wikitable"  
 
+
|-
{| border="1" cellspacing="0" cellpadding="0" width="434" style="width:434px;"
+
! scope="row" colspan="3" | BITSI Extended
 
|-
 
|-
 
+
! scope="row" width="120px" | Function
| style="colspan="3";" |  
+
! scope="row" width="150px" | Byte 1 (ASCII/code)
'''BITSI Extended'''
+
! scope="row" width="150px" | Byte 2
 
 
 
|-
 
|-
| style="width:122px;height:22px;" |
+
| Marker Out
'''Function'''
+
| M / 77
 
+
| Marker Value
| style="width:161px;height:22px;" |
 
'''Byte 1 (ASCII / code)'''
 
 
 
| style="width:151px;height:22px;" |  
 
'''Byte 2'''
 
 
 
 
|-
 
|-
| style="width:122px;height:22px;" |
+
| Pulse Out
Marker out
+
| P / 80
 
+
| Marker Value
| style="width:161px;height:22px;" |  
 
M / 77
 
 
 
| style="width:151px;height:22px;" |
 
Marker value
 
 
 
 
|-
 
|-
| style="width:122px;height:22px;" |
+
| Pulse Time
Pulse out
+
| T / 88
 
+
| ms before pulse reset
| style="width:161px;height:22px;" |
 
P / 80
 
 
 
| style="width:151px;height:22px;" |  
 
Marker value
 
 
 
 
|-
 
|-
| style="width:122px;height:22px;" |
+
| Analog Out 1
Pulse time
+
| Y / 89
 
+
| Analog Output Value
| style="width:161px;height:22px;" |
 
T / 88
 
 
 
| style="width:151px;height:22px;" |  
 
ms before pulse reset
 
 
 
 
|-
 
|-
| style="width:122px;height:22px;" |
+
| Analog Out 2
Analog out 1
+
| Z / 90
 
+
| Analog Output Value
| style="width:161px;height:22px;" |
 
Y / 89
 
 
 
| style="width:151px;height:22px;" |  
 
Analog output value
 
 
 
 
|-
 
|-
| style="width:122px;height:22px;" |
+
| Tone
Analog out 2
+
| T / 84
 
+
| Start Tone
| style="width:161px;height:22px;" |
 
Z / 90
 
 
 
| style="width:151px;height:22px;" |  
 
Analog output value
 
 
 
 
|-
 
|-
| style="width:122px;height:22px;" |
+
| Detect Sound
Tone
+
| D /
 
+
| S / 83
| style="width:161px;height:22px;" |
 
T / 84
 
 
 
| style="width:151px;height:22px;" |
 
Start tone
 
 
 
 
|-
 
|-
| style="width:122px;height:22px;" |
+
| Detect Voice
Detect Sound
+
| D /
 
+
| V / 83
| style="width:161px;height:22px;" |
 
D
 
 
 
| style="width:151px;height:22px;" |
 
S / 83
 
 
 
 
|-
 
|-
| style="width:122px;height:22px;" |
+
| Calibrate Sound
Detect Voice
+
| C /  
 
+
| S
| style="width:161px;height:22px;" |
 
D /
 
 
 
| style="width:151px;height:22px;" |
 
V / 83
 
 
 
 
|-
 
|-
| style="width:122px;height:22px;" |
+
| Calibrate Voice
Calibrate Sound
+
| C /
 
+
| V
| style="width:161px;height:22px;" |
 
C /
 
 
 
| style="width:151px;height:22px;" |  
 
S
 
 
 
 
|-
 
|-
| style="width:122px;height:22px;" |
+
| Analog In 1
Calibrate Voice
+
| A /  
 
+
| 1
| style="width:161px;height:22px;" |
 
C /
 
 
 
| style="width:151px;height:22px;" |  
 
V
 
 
 
 
|-
 
|-
| style="width:122px;height:22px;" |
+
| Analog In 2
Analog in 1
+
| A /  
 
+
| 2
| style="width:161px;height:22px;" |
 
A /
 
 
 
| style="width:151px;height:22px;" |  
 
1
 
 
 
 
|-
 
|-
| style="width:122px;height:22px;" |
+
| Analog In 3
Analog in 2
+
| A /  
 
+
| 3
| style="width:161px;height:22px;" |
 
A /
 
 
 
| style="width:151px;height:22px;" |  
 
2
 
 
 
 
|-
 
|-
| style="width:122px;height:22px;" |
+
| Analog In 4
Analog in 3
+
| A /  
 
+
| 4
| style="width:161px;height:22px;" |
 
A /
 
 
 
| style="width:151px;height:22px;" |  
 
3
 
 
 
 
|-
 
|-
| style="width:122px;height:22px;" |
+
| LEDs Off
Analog in 4
+
| L /  
 
+
| X
| style="width:161px;height:22px;" |
 
A /
 
 
 
| style="width:151px;height:22px;" |  
 
4
 
 
 
 
|-
 
|-
| style="width:122px;height:22px;" |
+
| LEDs Input
LEDs off
+
| L /  
 
+
| I
| style="width:161px;height:22px;" |
 
L /
 
 
 
| style="width:151px;height:22px;" |  
 
X
 
 
 
 
|-
 
|-
| style="width:122px;height:22px;" |
+
| LEDs Output
LEDs input
+
| L /  
 
+
| O
| style="width:161px;height:22px;" |
 
L /
 
 
 
| style="width:151px;height:22px;" |  
 
I
 
 
 
 
|-
 
|-
| style="width:122px;height:22px;" |
+
|}
LEDs output
 
 
 
| style="width:161px;height:22px;" |
 
L /
 
 
 
| style="width:151px;height:22px;" |
 
O
 
  
|}
+
== Port Settings ==
  
<u>'''Trigger port settings'''</u>
+
===Trigger port ===
  
[[File:Connector.png|300x300px|Connector.png]]
+
[[File:Connector.png|thumb|300x300px|Schematic view of the 25 pins connector]]
  
 
The 25 pins female connector has 8 inputs and 8 outputs, respectively 1-8 are inputs and 9-16 are outputs. Three analog input with an analog to digital convertor of 12 bit, pins 17,18,20 and 21. Two analog outputs with an digital to analog convertor of 12 bits on pins 22 and 23.
 
The 25 pins female connector has 8 inputs and 8 outputs, respectively 1-8 are inputs and 9-16 are outputs. Three analog input with an analog to digital convertor of 12 bit, pins 17,18,20 and 21. Two analog outputs with an digital to analog convertor of 12 bits on pins 22 and 23.
  
<u>'''Serial port settings'''</u>
+
===Serial port===
  
 
Our hardware design allows to be connected to the computers USB and emulates a serial communication Port.
 
Our hardware design allows to be connected to the computers USB and emulates a serial communication Port.
  
{| border="1" cellspacing="0" cellpadding="0"
+
{| class="wikitable"
 
|-
 
|-
|  
+
| Baudrate
'''Baudrate'''
+
| 115200
 
+
|-
| style="width:69px;" |  
+
| Parity
115200
+
| None
 
 
 
|-
 
|-
|  
+
| Data bits
'''Parity'''
+
| 8
 
 
| style="width:69px;" |
 
none
 
 
 
 
|-
 
|-
|  
+
| Stop bits
'''Data bits'''
+
| 1
 
 
| style="width:69px;" |
 
8
 
 
 
 
|-
 
|-
|  
+
| Flow control
'''Stop bits'''
+
| None
 
 
| style="width:69px;" |
 
1
 
 
 
 
|-
 
|-
|
 
'''Flow control'''
 
 
| style="width:69px;" |
 
none
 
 
 
|}
 
|}
  
== USB-Com port settings ==
+
=== USB-Com port ===
  
 
1.Connect the BITSIbox to your computer using the USB cable.
 
1.Connect the BITSIbox to your computer using the USB cable.
Line 415: Line 222:
 
Always connect the usb device to the same port and your settings will be remembered.
 
Always connect the usb device to the same port and your settings will be remembered.
  
== TSG ButtonBox hardware 2013 ==
+
== Software Settings ==
 
 
Find the hardware design here&nbsp;[[Buttonbox 2013 Hardware|Buttonbox_2013_Hardware]]
 
 
 
== TSG ButtonBox software 2013 ==
 
 
 
Find the code here [[Media:BITSI_tempalte2015_duemilanove.zip]]
 
  
== Presentation Settings ==
+
=== Neurobs Presentation ===
  
 
The experiment files needs a few settings for the device to work:
 
The experiment files needs a few settings for the device to work:
Line 434: Line 235:
 
|}
 
|}
  
== Buttonbox in Python and PsychoPy ==
+
=== Python/PsychoPy ===
  
 
Download this site package to use the buttonbox: [https://pypi.python.org/pypi/RuSocSci rusocsci]
 
Download this site package to use the buttonbox: [https://pypi.python.org/pypi/RuSocSci rusocsci]
Line 500: Line 301:
 
For more documentation click here: http://pythonhosted.org//RuSocSci/index.html
 
For more documentation click here: http://pythonhosted.org//RuSocSci/index.html
  
== Matlab Settings ==
+
=== Matlab ===
  
 
  <nowiki>
 
  <nowiki>
Line 652: Line 453:
 
end
 
end
 
</nowiki>
 
</nowiki>
 +
 +
== Downloads ==
 +
 +
=== Hardware Design ===
 +
*[[Buttonbox 2013 Hardware|Buttonbox 2013 Hardware Design]]
 +
 +
=== Software ===
 +
 +
*[[Media:BITSI_tempalte2015_duemilanove.zip|Code Template 2015 (Duemilanove)]]

Revision as of 11:50, 8 April 2015

The buttonbox is used for time accurate(1ms) button press registration. We use it to register buttonpresses, soundkey, voicekey signals and to send tone onset, analog output, triggers with the BITSI protocol. It is suitable for Behavioral, EEG, MEG, and fMRI experiments. The buttonbox is connected to a computer with a usb connection.

The output connector has two binary eight bit ports: input and output. The two ports can be used for responses (input) and stimulus triggers (output). Two 8 bits analog outputs and three 8 bits analog inputs. The output connector has a sound and voicekey which triggers when a amplitude reaches a threshold. By using the serial port, the BITSI can be used platform independently: it works on Windows, Linux and Mac OSX. Most programming environments and stimulus packages support serial communication.

BITSI Protocol

BITSI stands for Bits to Serial Interface. Because the BITSI is designed to interface both in- and output signals, the 'protocol' is asymmetric: the input and output protocols differ.

Input

The input port can be used to interface eight buttons maximally. Button presses are translated to serial output characters/bytes according to the following table:

BITSI Simple
Signal/Button ASCII (rise/fall) Code (rise/fall)
1 A / a 65 / 97
2 B / b 66 / 98
3 C / c 67 / 99
4 D / d 68 / 100
5 E / e 69 / 101
6 F / f 70 / 102
7 G / g 71 / 103
1 H / h 72 / 104
1 A / a 65 / 97
Soundkey S / s 83 / 115
Voicekey V / v 86 / 118

This means that when signal 1 gets active(button press), a capital A will be sent to the serial port. A lowercase 'a' will be sent when the signal is deactivated(button release). Mechanical buttons can be connected directly.

Output

Output knows two protocols: BITSI simple or BITSI extended. To enter a certain protocol two buttons have to be pressed when the BITSIbox is powered. Press button H and A for simple mode and H and B for extended mode.

If no button is pressed when powered it boots the last known protocol. In the simple protocol every byte sent to the BITSI over the serial port, is represented at the 8 bit output.

The extended protocol uses two bytes(or two characters), this combination can access two analog outputs and a tone generator. The first byte selects the output. The second byte determines the value written to this output.

BITSI Extended
Function Byte 1 (ASCII/code) Byte 2
Marker Out M / 77 Marker Value
Pulse Out P / 80 Marker Value
Pulse Time T / 88 ms before pulse reset
Analog Out 1 Y / 89 Analog Output Value
Analog Out 2 Z / 90 Analog Output Value
Tone T / 84 Start Tone
Detect Sound D / S / 83
Detect Voice D / V / 83
Calibrate Sound C / S
Calibrate Voice C / V
Analog In 1 A / 1
Analog In 2 A / 2
Analog In 3 A / 3
Analog In 4 A / 4
LEDs Off L / X
LEDs Input L / I
LEDs Output L / O

Port Settings

Trigger port

Schematic view of the 25 pins connector

The 25 pins female connector has 8 inputs and 8 outputs, respectively 1-8 are inputs and 9-16 are outputs. Three analog input with an analog to digital convertor of 12 bit, pins 17,18,20 and 21. Two analog outputs with an digital to analog convertor of 12 bits on pins 22 and 23.

Serial port

Our hardware design allows to be connected to the computers USB and emulates a serial communication Port.

Baudrate 115200
Parity None
Data bits 8
Stop bits 1
Flow control None

USB-Com port

1.Connect the BITSIbox to your computer using the USB cable.

2.When you connect the BITSIbox, Windows should initiate the driver installation process (if you haven't used the computer with an BITSIbox board before).

3.On Windows Vista/7, the driver should be automatically downloaded and installed.

4.On Windows XP, the Add New Hardware wizard will open:

  • When asked Can Windows connect to Windows Update to search for software? select No, not this time. Click next.
  • Select Install from a list or specified location (Advanced) and click next.
  • Make sure that Search for the best driver in these locations is checked; uncheck Search removable media; check Include this location in the search and browse to the c:/beheer/arduino/drivers directory.
  • The wizard will search for the driver and then tell you that a "USB Serial Converter" was found. Click finish.
  • The new hardware wizard will appear again. Go through the same steps and select the same options and location to search. This time, a "USB Serial Port" will be found.

How to Check the Com Port settings(important!)

  • From the Start menu, open the Control Panel.
  • From the control panel, open the System window.
  • From the system properties window, go to the Hardware tab and click the Device Manager button.
  • From the Device Manager window, click Ports (Com&LPT). You should now be able to see which Com Port the USB adapter is assigned to.
  • If the Com Port is 10 or higher, you will have to change it to a lower port.
  • From the Device Manager window, click on USB Serial Port (Com#). Click the Port Settings tab of the USB Serial Port Properties window, and then click the Advanced button.
  • In the Advanced Settings window, use the scroll input to select a Com Port (select 10 or lower). Change Receive (bytes) and Transmit (bytes) to 64. Change the Latency Timer to 1.
  • Click the OK button.

Always connect the usb device to the same port and your settings will be remembered.

Software Settings

Neurobs Presentation

The experiment files needs a few settings for the device to work:

  • In the settings tab: port -> input port -> 1 must be the device that identifies itself as "Arduino Uno" in the device manager. Note that the port must have a number not higher than 10 (COM1-COM10). Use re-enumerate if it is higher.
  • Rate must be set 115200, Parity to None, Data Bits to 8 and Stop Bits to 1, Uncheck FIFO Interrupt.
File:Buttonbox1.png

Python/PsychoPy

Download this site package to use the buttonbox: rusocsci

Example using buttons from the buttonbox in Python:

#!/usr/bin/env python

# import the rusocsci.buttonbox module
from rusocsci import buttonbox 

# make a buttonbox
bb = buttonbox.Buttonbox()

# wait for a single button press
b = bb.waitButtons()

# print the button pressed
print("b: {}".format(b)) 

Example using markers with the buttonbox in Python:

#!/usr/bin/env python

# import the rusocsci.buttonbox module
from rusocsci import buttonbox 

# make a buttonbox
bb = buttonbox.Buttonbox()

# wait for a single button press
bb.sendMarker(val=100)    #This is your marker code, range code 1-255 


Example using the Buttonbox in PsychoPy:

#!/usr/bin/env python

# import psychopy and rusocsci
from psychopy import core, visual 
from rusocsci import buttonbox

## Setup Section
win = visual.Window(monitor="testMonitor")
bb = buttonbox.Buttonbox()
text = visual.TextStim(win, "Press a button on the buttonbox")

## Experiment Section
# show text
text.draw()
win.flip()
# wait for response
b = bb.waitButtons()
# show response
text.setText("you pressed: {}".format(b))
text.draw()
win.flip()
core.wait(5)

## Cleanup Section
core.quit() 

For more documentation click here: http://pythonhosted.org//RuSocSci/index.html

Matlab

function handle = buttonbox(cmd,varargin)
% to initialize connection:
%    define settings as structure with fields:
%       bb.Device    = 'COM2';
%       bb.BaudRate  = 115200;
%       bb.DataBits  = 8;
%       bb.StopBits  = 1;
%       bb.Parity    = 'none';
% handle = buttonbox('open',bb)
%
% to run:
% buttonbox('run',handle);
%
% to close the connection:
% buttonbox('close',handle);

persistent old_hdl  % keep handle to COM object persistent

% set defaults
bb.Device    = 'COM2';
bb.BaudRate  = 115200;
bb.DataBits  = 8;
bb.StopBits  = 1;
bb.Parity    = 'none';

if nargin < 1
    cmd = 'open';
end
if nargin > 1
    % user overwrites default settings
    flds = fields(varargin{1});
    for n = 1 : numel(flds)
        bb.(flds{n}) = varargin{1}.(flds{n});
    end
end


switch cmd
    case 'open'
        % get handle to serial device
        handle = open_buttonbox(bb);
        return
    case 'close'
        if nargin > 0
            handle = varargin{1};
        else
            handle = old_hdl;
        end
        fclose(handle);
        return
    case 'run'
        % read incoming data
        if isempty(old_hdl)
            help serial_buttonbox_common
            error('Buttonbox not yet initialized');
        end
        handle = old_hdl;
    otherwise
        fprintf('Unknown option %s\n',cmd);
        return
end

% only gets here when cmd = 'run'
% Initialize output figure
win = list_output(' ',[]);
while 1
    % Exit if user closed output figure
    if ~ishandle(win)
        return
    end
    % start polling for characters (indicating start of scan)
    navailable = handle.BytesAvailable;
    if navailable
        data = [];
        while navailable
            % read incoming data
            [newdata, cnt] = fread(handle, navailable);
            % concatenate possible new data 
            if cnt
                data = [data newdata(:)];
            end
            % check if any more data left
            navailable = handle.BytesAvailable;
        end
        % output info about which button was pressed 
        for n = 1 : numel(data)
            line = sprintf('incoming: %03d   %s',data(n),char(data(n)));
            list_output(line,win);
        end
    end
    pause(0.01);
end %while 1

    function hdl = open_buttonbox(device)
        % open handle to serial device (mini buttonbox)
        try
            hdl = serial(device.Device, 'Baudrate', device.BaudRate, 'DataBits', device.DataBits, 'StopBits', device.StopBits, 'Parity', device.Parity);
            fopen(hdl);
        catch
            if ~isempty(old_hdl)
                fclose(old_hdl);
                delete(old_hdl);
            end
            hdl = serial(device.Device, 'Baudrate', device.BaudRate, 'DataBits', device.DataBits, 'StopBits', device.StopBits, 'Parity', device.Parity);
            fopen(hdl);
        end
        old_hdl = hdl;
        
        fprintf('Wait for device buttonbox....\n');
        tic
        while hdl.BytesAvailable && toc<10
            navailable = bbox.BytesAvailable;
            % wait for welcome message device
            fread(hdl, navailable);
        end
        pause(0.5);
    end

    function win = list_output(line,win)
        persistent ptr
        persistent lines
        persistent edt
        Maxlines = 40; 
        
        if isempty(win)
            % initialize listbox output figure
            lines = cell(1,Maxlines);
            [lines(1:end)]=deal({''});
            ptr=Maxlines;
            lines(ptr) = {'Buttonbox output:'};
            idxs = mod(ptr:ptr+Maxlines-1,Maxlines)+1;

            win = figure();
            % initialize figure to hold output text
            edt = uicontrol('Parent',win,'Style','ListBox','HorizontalAlignment','left', ...
            'Max',Maxlines,'BackgroundColor',[1 1 1],'Visible','on','String',lines(idxs), ...
            'FontSize',12,'Value',Maxlines);
            pos = get(win,'Position');
            set(edt,'Position',[1 1 pos(3) pos(4)]);
        end  
        ptr = mod(ptr,Maxlines)+1; % start 
        lines{ptr} = line;
        idxs = mod(ptr:ptr+Maxlines-1,Maxlines)+1;
        set(edt,'String',lines(idxs),'Value',Maxlines);
        drawnow; 
    end

end

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