Peter H Anderson – Embedded Processor Control
PC Parallel Port, BasicX, BASIC Stamp, 68HC11, PIC, PICAXE, Data Acquisition and Control, Serial Control and Measurement. Many Microchip PIC Types , Use of a PC Printer Port for Control and Data Acquisition, 68HC11 Assembly Language ProgrammingParallel Port Interfacing with 2, 3 and 4 Wire Serial Devices.
This is a combination of LCD PIC, an assembled printed circuit board from ModernDevice.com, a 20X4 LCD with Blue / White backlight and interfacing connector
This design provides an interface between a 9600 baud (or similar) serial line from a Microchip PIC, Arduino, Parallax Basic Stamp, NetMedia BX24, PICAXE and similar and a character LCD having an HD44780 interface.
Serial LCD Kit with Variable LED Backlight
The serial interface is TTL. That is, the idle state is a TTL logic one, or near +5 VDC. This is often termed non-inverting or true. This provides direct compatibility with the UART associated with a PIC, SerOut on a Basic Stamp and Com3 on a BX24. When interfacing with a PC or similar where the logic is inverted, an inverter is required. This might be as simple as a single 2N3904 NPN transistor.
(this is a very useful computer interfacing resource for instrumentation – delabs)