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PS/2 to Breadboard Adapter (#28060)
The Parallax PS/2 to Breadboard Adapter makes it convenient to connect a PS/2 mouse or keyboard to
breadboards, protoboards and perfboards with 0.1-inch hole spacing. Designed with the Propeller
Education Kit in mind, this adapter simplifies connecting PS/2 mice and keyboards to the PE Platform’s
Propeller Microcontroller.
Our “...to Breadboard” adapters make connectors breadboard-friendly for prototyping. These adaptors
tend not to feature built-in circuits, just the connector mounted on a PCB and routed to pins. This makes
each adapter more flexible for different applications. Hand wiring the interface circuit also gives students
the opportunity to become more familiar with the relationships between circuits, theory of operation, and
microcontroller code.
Features
PS/2 female socket (mini-DIN-6)
4 dual-pin DIP board provides a steady
base for plugging and unplugging the
peripheral's cable.
Compact board can be oriented across a
breadboard trench lengthwise or
crosswise for flexibility in parts
placement.
Narrow width (approx. 0.525”) allows
for placement of multiple adjacent
modules with minimal breadboard space
consumed.
Key Specifications
Supply voltage: +5 VDC
Supply current: See PS/2 peripheral’s
specifications
Communication: Synchronous serial,
open collector
Package: 4 dual-pin DIP, 0.1” spacing
Operating temperature: 0 – 70° C.
Size: 0.92 in H x 0.525 in W x 0.90 in D
(23 mm x 13.3 mm x 22.8 mm)
Weight: 7.8 g (0.28 oz)
Pin Definitions & Schematic
GND
Ground (Vss)
5V
Regulated +5 VDC
DAT
Data (I/O pin)
CLK
Clock (I/O pin)
The two pins in each pin-pair are electrically
connected to each other; either pin by a
given pin label can be used to make the
electrical connection.
5V
GND
DAT
CLK
Copyright © Parallax Inc.
PS/2 to Breadboard Adapter (#28060)
v1.0 7/3/2008 Page 1 of 5
Dimensions
Dimensions are approximate and subject to minor changes based on component availability.
Example Programs and Applications
Propeller Microcontroller – Test Parallax PS/2 Keyboard
This application tests the Parallax PS/2 keyboard connected to Propeller chip I/O pins P26 and P27 and
displays the characters entered in the Parallax Serial Terminal. This program relies on the Keyboard and
FullDuplexSerial objects, which are included in the Propeller Tool software’s Propeller Library. The
Parallax Serial Terminal is available for free from the Downloads link at www.parallax.com/Propeller.
Set the Parallax Serial Terminal’s Com Port to your Propeller microcontroller’s programming port.
Set the Parallax Serial Terminal’s baud rate to 57600.
Use the Propeller Tool software to load Test Parallax Keyboard.spin into the Propeller chip.
You can click the Parallax Serial Terminal’s Enable button immediately after starting the Propeller
Tool software’s Load EEPROM feature. The Parallax Serial Terminal will automatically wait for the
Propeller Tool to finish before opening the Com Port.
If you waited more than 1 second after the Propeller Tool finished loading the program, you might not
see the “Type characters on the PS2 Keyboard:” message.
To display the “Type characters…” message, you can restart the program by holding your
computer keyboard’s CTRL key and clicking the Parallax Serial Terminal’s DTR checkbox.
5V
GND
DAT
CLK
Schematic for Test Parallax Keyboard.spin
Copyright © Parallax Inc.
PS/2 to Breadboard Adapter (#28060)
v1.0 7/3/2008 Page 2 of 5
'' Test Parallax Keyboard.spin
'' Displays characters typed on the Parallax PS/2 keyboard in the Parallax Serial Terminal.
'' See 28060-PS2-to-Breadbaord.PDF for schematics and instructions.
CON
_clkmode
_xinfreq
CLS
=
CR
=
OBJ
keys : "Keyboard"
debug : "FullDuplexSerial"
PUB KeyboardDisplay
keys.start(26, 27)
debug.start(31, 30, 0, 57600)
waitcnt(clkfreq + cnt)
' Start keyboard
' Start serial connection
' Wait 1 s before starting
' Declare keyboard object
' Declare FullDuplexSerial object
= xtal1 + pll16x
= 5_000_000
16
13
' System clock settings
' Parallax Serial Terminal constants
' Display static text.
debug.str(string(CLS, "Type characters on", CR, "the PS/2 keyboard:", CR, CR))
repeat
if keys.gotKey
debug.tx(keys.getKey)
' If key in buffer
' Display character
Propeller Microcontroller – Test Parallax PS/2 Mouse
This application tests the Parallax PS/2 mouse connected to Propeller chip I/O pins P24 and P25 and
displays the X, Y and scroll wheel positions along with the center (scroll wheel), right, and left buttons in
the Parallax Serial Terminal. This program relies on the Mouse and FullDuplexSerial objects, which are
included in the Propeller Tool software’s Propeller Library.
Change the I/O pin connections; they are different from the keyboard example.
For tips on finding and using the Parallax Serial Terminal, see the explanation and checklist
instructions in the Test Parallax PS/2 Keyboard example.
If you did not click the enable button within 1 second after the Propeller Tool’s Load EEPROM
feature finished, the “Mouse”, “x = ”, “y = “, and other labels might not display. To refresh the
display, you can restart the application by holding down your computer keyboard’s CTRL key and
clicking the Parallax Serial Terminal’s DTR checkbox.
5V
GND
DAT
CLK
Schematic for Test Parallax Mouse.spin
Copyright © Parallax Inc.
PS/2 to Breadboard Adapter (#28060)
v1.0 7/3/2008 Page 3 of 5
'' Test Parallax Mouse.spin
'' Displays Parallax mouse X, Y, and Scroll button coordinates along with the scroll wheel,
'' right and left button states in the Parallax Serial Terminal.
'' See 28060-PS2-to_Breadbaord.PDF for schematics and instructions.
CON
_clkmode = xtal1 + pll16x
_xinfreq = 5_000_000
HOME
CRSRXY
CR
CLREOL
CLS
OBJ
mouse : "Mouse"
debug : "FullDuplexSerial"
' Declare Mouse object
' Declare FullDuplexSerial object
=
=
=
=
=
1
2
13
11
16
' System clock settings
' Parallax Serial Terminal constants
PUB MouseDisplay | mousex, mousey, mousez, mousebtns
mouse.start(24, 25)
debug.start(31, 30, 0, 57600)
waitcnt(clkfreq + cnt)
' Start mouse
' Start serial connection
' Wait 1 s before starting
' Display static text.
debug.str(String(CLS, "Mouse", CR, "x = ", CR, "y = ", CR, "scroll = ", CR, "CRL", HOME))
repeat
mousex +=
mousey +=
mousez +=
mousebtns
mouse.delta_x
mouse.delta_y
mouse.delta_z
:= mouse.buttons
' Get mouse data
debug.str(string(CRSRXY, 4, 1))
debug.dec(mousex)
debug.str(string(CLREOL, CRSRXY, 4, 2))
debug.dec(mousey)
debug.str(string(CLREOL, CRSRXY, 9, 3))
debug.dec(mousez)
debug.str(string(CLREOL, CR, CR))
debug.bin(mouse.buttons, 3)
waitcnt(clkfreq/20 + cnt)
' Display mouse data
Copyright © Parallax Inc.
PS/2 to Breadboard Adapter (#28060)
v1.0 7/3/2008 Page 4 of 5
Resources and Downloads
To get to the resources listed in this section, go to
www.parallax.com,
enter the part number into the
Search field, and click the Go button.
The examples in this document require a PS/2 mouse and keyboard.
Parallax PS/2 Optical Mouse (#32350)
Parallax PS/2 Mini Keyboard (#32351)
There are more examples that rely on PS/2 keyboards and mice in the Propeller Library – Demos folder.
These examples also require a television display such as the Mini LCD A/V Color Display. This display is
also included in the Propeller Accessories Kit along with a Parallax PS/2 Optical mouse and Mini Keyboard.
You can connect a television display to your PE Platform or other breadboard with the RCA to Breadboard
Adapter.
Mini LCD A/V Color Display (#603-32000)
Propeller Accessories Kit (#32311)
RCA to Breadboard Adapter (#28050)
The Propeller Education Kit 40-pin DIP and PropStick USB versions are both compatible with these
adapters. The Propeller Education Kit also features tutorials for getting started with the Propeller
Microcontroller.
Propeller Education Kit – 40 Pin DIP version (#32305)
Propeller Education Kit – PropStick USB version (#32306)
Copyright © Parallax Inc.
PS/2 to Breadboard Adapter (#28060)
v1.0 7/3/2008 Page 5 of 5
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