ButtonBoxes

Buttonbox

2013 Buttonbox
Downloads
Buttonbox 2013 Hardware Design Code Template 2015 (Duemilanove) RuSocSci (Python package)

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 12 bits analog outputs and three 12 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
8	H / h	72 / 104

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	X / 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.

Testing Buttonbox

When pressing on the A button within the input channel tester. You will see the following ASCII code.

Adding Marker

Testing Markers (output)

Send code 1 for Button A

Button A will light up.

Send code 0 for clearing.

Example PCL code you can program a handle to send a marker:

#handle:
output_port OutputPort = output_port_manager.get_port( 1 );

Example to send a marker:

OutputPort.send_code(100); #create a marker

for more information see chapter 8 in the presentation course by clicking here

Python/PsychoPy

Download this site-package to use the buttonbox: rusocsci

Example using buttons from the buttonbox in Python:

 1#!/usr/bin/env python
 2
 3# import the rusocsci.buttonbox module
 4from rusocsci import buttonbox 
 5
 6# make a buttonbox
 7bb = buttonbox.Buttonbox()
 8
 9# wait for a single button press
10b = bb.waitButtons()
11
12# print the button pressed
13print("b: {}".format(b))

Example using markers with the buttonbox in Python:

 1#!/usr/bin/env python
 2
 3# import the rusocsci.buttonbox module
 4from rusocsci import buttonbox 
 5
 6# make a buttonbox
 7bb = buttonbox.Buttonbox()
 8
 9# send a marker
10bb.sendMarker(val=100)    #This is your marker code, range code 1-255

Example using BITSI extended in Python:

 1#!/usr/bin/env python
 2
 3# import the rusocsci.buttonbox module
 4from rusocsci import buttonbox 
 5
 6# make a buttonbox
 7bb = buttonbox.Buttonbox()
 8
 9# select a function
10bb.sendMarker(val=(ord(X)))    #select pulse time
11bb.sendMarker(val=2)           #set time of dureation pulse to 2ms
12
13bb.sendMarker(val=(ord(M)))    #select marker out
14bb.sendMarker(val=115)           #set marker value 115

Example using BITSI extended analog read in Python:

 1#!/usr/bin/env python
 2
 3# import the rusocsci.buttonbox module
 4import serial
 5
 6# make a buttonbox
 7ser = serial.Serial("COM2", 115200, timeout = 0.10 )
 8
 9while True:
10	ser.write('A1')
11	ser.flush()
12	x = ser.readline()
13	visual.TextStim(win, text=x).draw()
14
15	# black screen for 1000 ms
16	win.flip()
17
18	key = event.getKeys()
19	try:
20		if key[0]=='escape':
21			break
22	except:
23		continue

Example using the Buttonbox in PsychoPy:

 1#!/usr/bin/env python
 2
 3# import psychopy and rusocsci
 4from psychopy import core, visual 
 5from rusocsci import buttonbox
 6
 7## Setup Section
 8win = visual.Window(monitor="testMonitor")
 9bb = buttonbox.Buttonbox()
10text = visual.TextStim(win, "Press a button on the buttonbox")
11
12## Experiment Section
13# show text
14text.draw()
15win.flip()
16# wait for response
17b = bb.waitButtons()
18# show response
19text.setText("you pressed: {}".format(b))
20text.draw()
21win.flip()
22core.wait(5)
23
24## Cleanup Section
25core.quit()

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

Matlab

  1function ret = buttonbox(cmd,varargin)
  2% to initialize connection: (omit 2nd argument if defaults apply)
  3%    define settings as structure with fields:
  4%       bb.Device    = 'COM2';
  5%       bb.BaudRate  = 115200;
  6%       bb.DataBits  = 8;
  7%       bb.StopBits  = 1;
  8%       bb.Parity    = 'none';
  9% handle = buttonbox('open',bb)
 10%
 11% to run: (receiving incoming data, check code for own purposes)
 12% buttonbox('run');
 13%
 14% or
 15%
 16% to send a marker: (marker: a numeric value)
 17% buttonbox(marker)
 18%
 19% or
 20%
 21% to wait for a buttonpress:
 22% buttonbox('clear'); (make sure buttonbox buffer is emptied)
 23% key = buttonbox('wait_keypress')
 24%
 25% to close the connection:
 26% buttonbox('close'); 
 27
 28persistent old_hdl  % keep handle to COM object persistent 
 29% set defaults
 30bb.Device    = 'COM2';
 31bb.BaudRate  = 115200;
 32bb.DataBits  = 8;
 33bb.StopBits  = 1;
 34bb.Parity    = 'none'; 
 35if nargin < 1
 36   cmd = 'open';
 37end
 38if nargin > 1
 39   % user overwrites default settings
 40   flds = fields(varargin{1});
 41   for n = 1 : numel(flds)
 42      bb.(flds{n}) = varargin{1}.(flds{n});
 43   end
 44end
 45if nargin==1 && isnumeric(cmd)
 46   marker = cmd;
 47   cmd = 'marker';
 48end
 49
 50if ~any(strcmp(cmd,{'open','close'}))
 51   if isempty(old_hdl)
 52      help serial_buttonbox_common
 53      error('Buttonbox not yet initialized');
 54   end
 55   handle = old_hdl;
 56end
 57
 58switch cmd
 59   case 'marker'
 60      fwrite(handle, uint8(marker));%IOPort('Write', handle, uint8(marker), 1); % last argument: blocking
 61      WaitSecs(0.002);
 62      fwrite(handle, uint8(0));%IOPort('Write', handle, uint8(0), 0); % last argument: blocking
 63      return
 64   case 'clear'
 65      while(handle.BytesAvailable)
 66         fread(handle, 1);
 67      end      
 68      ret = []; % meaningless
 69      return
 70   case 'open'
 71      % get handle to serial device
 72      handle = open_buttonbox(bb);
 73      ret = handle;
 74      return
 75   case 'close'
 76      if nargin > 1
 77         handle = varargin{1};
 78      else
 79         handle = old_hdl;
 80      end
 81      fclose(handle);
 82      delete(handle);
 83      ret = [];
 84      return
 85   case 'run'
 86      % read incoming data
 87      % code proceeds below ....
 88   case 'wait_keypress'
 89      % start polling for characters (indicating start of scan)
 90      while(1)
 91         data = [];
 92         while handle.BytesAvailable
 93            navailable = handle.BytesAvailable;
 94            % read incoming data
 95            [newdata, cnt] = fread(handle, navailable);
 96            % concatenate possible new data
 97            if cnt
 98               data = [data newdata(:)];
 99            end
100         end
101         if ~isempty(data)
102            ret = data;
103            return
104         end
105      end
106   otherwise
107      fprintf('Unknown option %s\n',cmd);
108      ret = [];
109      return            
110end 
111
112%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
113% only gets here when cmd = 'run' %
114%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 
115% Initialize output figure
116win = list_output(' ',[]);
117while 1
118   % Exit if user closed output figure
119   if ~ishandle(win)
120      return
121   end
122   % start polling for characters (indicating start of scan)
123   navailable = handle.BytesAvailable;
124   if navailable
125      data = [];
126      while navailable
127         % read incoming data
128         [newdata, cnt] = fread(handle, navailable);
129         % concatenate possible new data
130         if cnt
131            data = [data newdata(:)];
132         end
133         % check if any more data left
134         navailable = handle.BytesAvailable;
135      end
136      % output info about which button was pressed
137      for n = 1 : numel(data)
138         line = sprintf('incoming: %03d   %s',data(n),char(data(n)));
139         list_output(line,win);
140      end
141   end
142   pause(0.01);
143end %while 1 
144
145
146
147   function hdl = open_buttonbox(device)
148      % open handle to serial device (mini buttonbox)      WaitSecs(0.002); % just to load mex-file into memory
149      try
150         hdl = serial(device.Device, 'Baudrate', device.BaudRate, 'DataBits', device.DataBits, 'StopBits', device.StopBits, 'Parity', device.Parity);
151         fopen(hdl);
152      catch
153         if ~isempty(old_hdl)
154            fclose(old_hdl);
155            delete(old_hdl);
156         end
157         hdl = serial(device.Device, 'Baudrate', device.BaudRate, 'DataBits', device.DataBits, 'StopBits', device.StopBits, 'Parity', device.Parity);
158         fopen(hdl);
159      end
160      old_hdl = hdl;      
161      fprintf('Wait for device buttonbox....\n');
162      tic
163      while hdl.BytesAvailable && toc<10
164         navailable = bbox.BytesAvailable;
165         % wait for welcome message device
166         fread(hdl, navailable);
167      end
168      pause(0.5);      
169   end 
170
171   function win = list_output(line,win)
172      persistent ptr
173      persistent lines
174      persistent edt
175      Maxlines = 40;      
176      if isempty(win)
177         % initialize listbox output figure
178         lines = cell(1,Maxlines);
179         [lines(1:end)]=deal({''});
180         ptr=Maxlines;
181         lines(ptr) = {'Buttonbox output:'};
182         idxs = mod(ptr:ptr+Maxlines-1,Maxlines)+1;         
183         win = figure();
184         % initialize figure to hold output text
185         edt = uicontrol('Parent',win,'Style','ListBox','HorizontalAlignment','left', ...
186            'Max',Maxlines,'BackgroundColor',[1 1 1],'Visible','on','String',lines(idxs), ...
187            'FontSize',12,'Value',Maxlines);
188         pos = get(win,'Position');
189         set(edt,'Position',[1 1 pos(3) pos(4)]);
190      end
191      ptr = mod(ptr,Maxlines)+1; % start
192      lines{ptr} = line;
193      idxs = mod(ptr:ptr+Maxlines-1,Maxlines)+1;
194      set(edt,'String',lines(idxs),'Value',Maxlines);
195      drawnow;
196   end 
197end
198end