CNC M33 User manual

M33 Rev. 1) User Manual
Revision 9/16/2009 http://cnc4pc.com/TechDocs/M33R1_User_Manual.pdf 1/6
M33 4 x 20 LCD Display
Rev. 1
User manual Rev. 1
1. Overview
This board provides an interface between a PoKeys55 and a 4 x 20 LCD.
2. Features
•4 x 20 LCD
•LCD contrast adjustment.
•5 I/O Terminals.
•Software Controlled LCD
LED
•Screw-On connections for all
terminals. You only have to
screw-on the wires to make all
your connections.
•Pins close to ground, +5vdc
and +3.3V connections

M33 (Rev. 1) User Manual
Revision: 9/16/2009 http://cnc4pc.com/TechDocs/M33R1_User_Manual.pdf 2/6
3. Base board description

M33 (Rev. 1) User Manual
Revision: 9/16/2009 http://cnc4pc.com/TechDocs/M33R1_User_Manual.pdf 3/6
4. Pinout
I/O
TERMINALS LDC PIN FUNCTION PoKeys55 PIN
1 GND GND
2 5V 5V
3 Contrast adjustment
4 Instruction/data input P29
5 Read/write P2
6 Enable signal P30
7 DB0 Data bus – bit 0 Not connected
DB0 Data bus – bit 1 Not connected
9 DB0 Data bus – bit 2 Not connected
10 DB0 Data bus – bit 3 Not connected
11 DB0 Data bus – bit 4 P26
12 DB0 Data bus – bit 5 P25
13 DB0 Data bus – bit 6 P24
14 DB0 Data bus – bit 7 P23
P33 I/O P33
P34 I/O P34
P43 I/O P43
P44 I/O P44
P32 I/O or LDC LED control P32
5V 5V 5V
3.3V 3.3V 3.3V
GND GND GND
Note: The LDC contrast is done using an on-board Variable resistor between GND and 5V.
Note: The LDC function is only available in the M2 “Pokeys55 Expansion board” port 3.
See the Pokeys33 and M2 user manuals to get more information
http://cnc4pc.com/Tech_Docs/M2_USER_MANUAL%20_Rev2.pdf
http://www.poscope.com/uploads/files/PoKeys55.pdf

M33 (Rev. 1) User Manual
Revision: 9/16/2009 http://cnc4pc.com/TechDocs/M33R1_User_Manual.pdf 4/6
5. Dimensions
5.1 LCD dimensions
All dimensions are in Millimeters.

M33 (Rev. 1) User Manual
Revision: 9/16/2009 http://cnc4pc.com/TechDocs/M33R1_User_Manual.pdf 5/6
5.2 Base board dimensions
All dimensions are in Millimeters.

M33 (Rev. 1) User Manual
Revision: 9/16/2009 http://cnc4pc.com/TechDocs/M33R1_User_Manual.pdf 6/6
5.3 Integrated LCD
All dimensions are in Millimeters.
Disclaimer:
Use caution. CNC machines could be dangerous machines. DUNCAN USA, LLC
or Arturo Duncan are not liable for any accidents resulting from the improper use of
these devices. The M33 is not fail-safe device, and it should not be used in life
support systems or in other devices where its failure or possible erratic operation
could cause property damage, bodily injury or loss of life.