how to control your own apparatus using pc printer port
DESCRIPTION
How to Control Your Own Apparatus using PC Printer Port. Viraj Vishwakantha Jayaweera. Printer. Touch pad. Scanner. Microphone. CPU. Monitor. Speaker. Mouse. Key Board. All these devices can be divided in to two categories. Output. Output. Process. Output. Input. Input. Input. - PowerPoint PPT PresentationTRANSCRIPT
CPU
Sp
eake
r
Monitor
Printer
Touch padScanner
Key Board
Mouse
Microphone
InputIn
pu
t
Output
Input
Output
Output
Input
All these devices can be divided in to two categories
Pro
cess
Motor
?
?Light Bulbs or LEDs
Water Censer Light Censer(LDR)
Micro Switch
Temperature Censer(Thermister)
?
Parallel Port (Printer Port)
USB(Universal Serial Bus)
RS232(Serial Port)
GPIB(Genaral Purpose Interface Bus)
Speaker MicrophoneLine In
Various types of connecters (communication ports) available in rear
side of CPU
100 101 102 103
1 1000 100 10
1000 * 0 = 0
100 * 1 = 100
10 * 6 = 60
1 * 4 = 4
= 164
Decimal Binary
We use Ten Symbols
0 1 2 3 4 5 6 7 8 9
20 21 22 23
1 8 4
8 * 1 = 8
4 * 1 = 4
2 * 0 = 0
1 * 1 = 1
= 13
We use Two Symbols
0 1 or Off On or Low Hi or 0V 5V
2
1 6 4 1 1 0 1 2
OutputOutput
Data 1Data 0
Data 2
Data 4Data 5
Data 3
Data 6Data 7ACKBusy
Paper EmptySelect
Strobe
InputInput
1 14
13 25
Initialize Printer
Auto FeedError
Select Input
Pins 18 – 25 Pins 18 – 25 GroundGround
OutputOutput
InputInput
8 Data Outputs (378 H)8 Data Outputs (378 H)
4 Other Outputs (379 H)4 Other Outputs (379 H)
5 Data Inputs (37a H)5 Data Inputs (37a H)
1 14
13 25
-+
5V
VCC
470 ohm
LED
Printer Port
Example in Qbasic
Out &H378,1 (for LED off)
Out &H378,0 (for LED on)
Example in Qbasic
Out &H378,1 (for LED off)
Out &H378,0 (for LED on)
1 14
13 25
LED
470 ohm
5 V
D0D1
D7
D2
Printer Port
NumberOutput Data bit pattern
D7 D6 D5 D4 D3 D2 D1 D0
0 0 0 0 0 0 0 0 0
1 0 0 0 0 0 0 0 1
2 0 0 0 0 0 0 1 0
3 0 0 0 0 0 0 1 1
4 0 0 0 0 0 1 0 0
5 0 0 0 0 0 1 0 1
6 0 0 0 0 0 1 1 0
…
255 1 1 1 1 1 1 1 1
0 = 0V (Low state) 1 = 5V (High state)
IN+
IN-
Comparator
¼ LM339
R43.3kohm
12V
VCC
R2100kohm
R3
10kohm
From
Printer Port
R5
R110kohm
3.3kohm
D400
1N4007D1
X
Y
K2
RELAY52
4
230 V ACL N
230V AC Motor
1 14
13 25
Printer Port
Switch
we can use Qbasic function inp()
X = Inp( &H379)
Print X
we can use Qbasic function inp()
X = Inp( &H379)
Print X
10
25
100 k
Preset
IN+
IN-
Comparator
10kohm
12V
To Printer
Port Input
100kohm
100kohm
52
4
5.6kohm
¼ LM339
LDR
1 M
Preset
