ryAn_ng83

hi, i'm doing a project which requires me to built and design a traffic control system (two T-junctions) i also need to create a display system using two 7-segment display for each direction. the duration for the dispay depends on the data that is send from the sensors(IR) located in each junction.
pls advice me how to tackle this project, which PIC to use that could handle so many inputs n outputs or any method to reduce the number of pins needed. thanks [/url]

jrz126

You can use some shift registers to expand the I/O, makes the programming slightly more difficult though.

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Jeff Zimmerman
To the optimist, the glass is half full.
To the pessimist, the glass is half empty.
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ryAn_ng83

so sorry but i don't really understand what u mean, btw which PIC should i use?

jrz126

you should post in the microcontrollers section, you'll probably get a better response

__________________
Jeff Zimmerman
To the optimist, the glass is half full.
To the pessimist, the glass is half empty.
To the engineer, the glass is twice as big as it needs to be.

ryAn_ng83

how to connect and control multiple 7-segment display?
do i need to connect a buffer to each 7-segment ? if yes, pls recommend which one to use.
what is the buffer for?

kinjalgp

You can connect multiple displays to a microcontroller using multiplexing technique in which only one display is driven at a time but to to high refresh rate all the displays appear to be on simultaneously.

Check out Nigel's PIC tutorial on multiplexed display.
http://www.winpicprog.co.uk/pic_tutorial10.htm

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