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EAGLE component library
9 Pin dot matrix printer using PIC16F84A
In this project we design 9 pin Microsoft Windows NT compatible dot matrix printer using two PIC16F84A microcontrollers. Printer mechanism is based on old Commodore dot matrix printer. At the moment this device support for Microsoft Windows 2000 and XP operating systems.
Other most notable features of this implementation are,
Drive 18V - 9pin magnetic dot matrix head unit
Handle 12V paper feeder and head movement stepper motors
Support A4 and compatible page formats
System drives using 240V - 18V step-down transformer
Audible warning system
Low power consumption due to CMOS implementation
Works with Standard Printer Port
In this implementation we use Microsoft Windows Driver Development Kit (DDK) with Microsoft Visual C++ to create device driver for the system and use Delphi 7 to create front end application (printer maintenance – control panel applet). Both microcontrollers are programmed using MPLAB – ASM.
Prototype of 9 Pin dot matrix printer
In this system we use 2 microcontrollers with 7MHz oscillators,
One PIC16F84A handles all incoming messages from LPT port and send status information to the port. This MCU also provide front end interface to the system (such as manual paper feeder switch, audible warning system, etc)
Second microcontroller handles printer head and paper feeder.
Other than PIC16F84s we use following semiconductors in this project,
Series of ULN2001 chips to interface system with printer head and stepper motors.
MC14066 as virtual switches
NE556 for audible warning system
LM317, LM7805, LM7812 power regulators
18DB05 Bridge rectifier module
During the test runs this printer produces an excellent results and only most notable limitation is its slow speed in printing. In future we plan to implement USB and Ethernet interfaces to this project.
Project Related Downloads
9 Pin dot matrix printer - Schematics and Source Codes
PIC16F84A - Microchip 8bit Microcontroller
ULN2001 - Seven Darlington Arrays
MC14066 - Quad Analog Switch/Quad Multiplexer
LM317 - 3-Terminal Adjustable Regulator
LM78xx - 3-Terminal 1A Positive Voltage Regulator
NE556 - Dual Timer
help on how to format text
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