how to use the parallel port to control 9 or more device

parallel port

  • parallel

    Votes: 0 0.0%

  • hehe

    Votes: 0 0.0%
  • Total voters
    0
Status
Not open for further replies.
B

buckboard

Newbie level 2
Joined
Dec 7, 2006
Messages
2
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Activity points
1,299
pcf8574p output register

how to use the parallel port to control 9 or more device indepedently....

help i'm thingking about this device to save electricy by using a controller (parallel port). the problem is i can only control 8 device at a time...

what i'm trying to do is to control 9 or more device independenty using he parallel port....

pls help me how....

any sugestion will be appriciated...

thanks..
 

hi
u can use multiplexer and tristate buffer for control your devices
 
With 8 data lines, 255 devices can be controlled (255 lines) by multiplexing the lines as 2^8.

from 00 to FF you can control.

..
 

To control several dvices via the parallel port don't use multplexers and/or buffers, as they work "momentary" .. you need latches ..
One option is to employ 8255 PPI ..
Here is an example:
"24-bit parallel port interface with 8255"
https://jap.hu/electronic/c64pio.html
Google for more ..

Regards,
IanP
 

You can use the parallel port's 8 data bits plus one of its control bits to give you 9 bits. General info here:
**broken link removed**

If you don't need high speed, another approach is to use a shift register such as 74HCT594. It provides eight outputs, and includes an output register. You can easily chain multiple devices, all controlled by a few wires. Here's a data sheet:
http://www.standardics.nxp.com/products/hc/pdf/74hc594.74hct594.pdf
 

Here is one of my designs a schematic of four 8-bit ports interfaced to the parallel port
 

wow...


THANKS


THANKS


THANKS....
 

spy h / spy i is a single wire but can control n number of devices.
 

Status
Not open for further replies.

Similar threads

Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…