using different ports to drive a seven segment dispaly

[aditi2809]

hello!
m using a pic 18f4520 to make a 3 digit 7 segment display.
one of the dispaly is being driven by 6 lines of port A and i plan to use one line of Port E. is this a decent idea?
what wil be the source code? please help asap. thank u
aditi

 

[tpetar]

You can use SPI, I2C, UART, 1-wire,.... for this.


**broken link removed**

Best regards,
Peter

 

[aditi2809]

thank u tpeter
but according to my project. i cant use any other component. please tell me
IF I CAN DRIVE A 7 SEGMeNTS DISPLAY WITH TWO DIFFERENT PORTS?

 

[tpetar]

On one bus you can use multiple displays.

But if you wish you can use separate protocol port pins, why not. Number of these protocol pins are limited on microcontroller.


Best regards,
Peter

 

[nandhu015]

Yes, you can use different ports to drive it.

But it needs a bit lot coding.

 

[djc]

hi,
Yes u can use different ports for driving 7 segment display. Then it will depend on ur software how u want to drive the display how many fnd's are there and what is the current requirment of fnd's. larger fnd recquires large current.

 

[tpetar]

thank u tpeter
but according to my project. i cant use any other component. please tell me
IF I CAN DRIVE A 7 SEGMeNTS DISPLAY WITH TWO DIFFERENT PORTS?

On illustrations from my post #2, there is no additional parts. Maybe you think on IC on 7-seg board.

Master is microcontroller.



Best regards,
Peter

:wink:

 

[aditi2809]

thank u every1 for the help
i am driving the display using 6 bus of port A (pins 2 to pins 7 of pic18f4250) and one bus of port E (pin 8).
what are the changes in the source code?

 

[tpetar]

PIC18F4520 have 1-UART, 1-A/E/USART, 1-SPI, 1-I2C1-MSSP(SPI/I2C)

https://www.microchip.com/wwwproducts/Devices.aspx?dDocName=en010297



Best regards,
Peter

 

[aditi2809]

dear tpeter
m new to thhis feild. plaese explain what are u trying to say

 

[tpetar]

In my post #9 its list with numbers of available protocol ports for PIC18F4520 which you using.




Best regards,
Peter

 

[aditi2809]

can u help me with the source code?
i am using a max 232. i need to transmit the data which i recieve to three different ports.
what can i do for it?

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what wil be the coding like.. any idea?

 

[jayanth.devarayanadurga]

You will need 7 pins for the segments and 3 pins to drive different display segments. You need a total of 7 + 3 pins.