Parallel LCD display

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PLD on top of the TV

PLD.

Information

Very simple module connected directly to the computer parallel port. The LCD display is powered by 5V, and has and internal fuse. The backlight is lit constantly. The contrast can be regulated with the variable resistor. The LCD display is driven and controlled by LCD Smartie, multiple screens alternate to show more information then the display can fit. I use it for song played on the computer, temperatures, voltages etc.

I/O

LCD pin	Name	Description	Centronics pin	DB25 pin
1	Vss	GND	19 30	18 25
2	Vcc	5V	n/a	n/a
3	VLc	Contrast (to a 10k variable resistor)	n/a	n/a
4	RS	Register Select	31	16
5	R/W	Read/Write (to GND)	n/a	n/a
6	E	Enable	1	1
7	D0	Data	2	2
8	D1	Data	3	3
9	D2	Data	4	4
10	D3	Data	5	5
11	D4	Data	6	6
12	D5	Data	7	7
13	D6	Data	8	8
14	D7	Data	9	9
15	VB+	Backlight (120 ohm to 5V)	n/a	n/a
16	VB-	Backlight (to GND)	n/a	n/a

Parts list

Quantity	Supplier	Part number	Description
1	Elfa	69-687-06	Power Supply Unit, switch regulated, 5 V=, 0.8A, 2.1mm
1	Elfa	50-216-05	Plastic Enclosure (Alu. lid), 110x70x49mm
1	Elfa	44-108-82	Centronics, chassi, 36-pin
9	Elfa	48-884-18	Unthreaded round spacer, 3mm, Ø6mm
1	Elfa	25-531-05	D-sub cable, pin-to-pin 3m, 25-pin male-female
1	Elfa	67-008-01	Aluminium electrolytic capacitor, 10uF 25V
1	Elfa	67-008-68	Aluminium electrolytic capacitor, 47uF 25V
1	Elfa	65-851-94	Ceramic Disc Capacitor, 1 nF 100V
1	Elfa	65-550-64	Foil capacitor, 0,01uF
1	Elfa	48-396-76	Laboratory card, 100x160mm (1/5)
1	Elfa	75-511-87	Dot matrix LCD display, 16x2 LED
1	Elfa	60-103-83	Carbon film resistor 5% 1/4W, 120 Ohm
1	Elfa	64-361-82	Trimmer, carbon, 10k horizontal
16	Elfa	43-708-05	Socket connector 2,54, 1×36, female
16	Elfa	43-702-19	Straight pin header 2,54, 1×36, PCB
1	Elfa	33-166-84	Fuse 5x20 mm, 200 mA, quick-acting
1	Elfa	33-150-17	Open fuse holder, PCB, 5x20mm
1	Elfa	33-150-25	Open fuse holder, PCB, Protective cover
1	Elfa	42-051-18	Power Jack, panel, 2,1mm