at89s8252 - Electronic Circuits Projects Diagrams Free

thendo · 9th December 2003, 11:52 AM

hi!

it's me again, this time i was wondering if i am able to connect a Switch(input) and a base a a transistor for selecting 7-segment display(output) all these in one pin of the AT89S8252 port1.

how will these work?

your response is highly appreciated!

**kinjalgp** · 9th December 2003, 12:04 PM

Can you re-frame your question? I am not able to udersatnd what you are asking.

thendo · 9th December 2003, 12:11 PM

Me again!

i'm asking if it's possible to use a pin as an input and output at the same time. my input is a switch and my output is a base of a transistor(To select one of the 7-segment displays).

1-PIN = 1 SWITCH + 1 TRANSISTOR.

how will it work?

ivancho · 9th December 2003, 02:41 PM

It might depend on what type of transistor you use and what state the pin is when the switch is close..... It might work as long as you make sure that the switch doesn't trigger the transistor.

Ivancho

**kinjalgp** · 9th December 2003, 04:24 PM

Yes it is possible through multiplexing. See this schematic and code. It just does what you are looking for :
http://chaokhun.kmitl.ac.th/~kswichi...-seg/7-seg.htm

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9th December 2003, 11:52 AM	(permalink)
thendo	at89s8252 hi! it's me again, this time i was wondering if i am able to connect a Switch(input) and a base a a transistor for selecting 7-segment display(output) all these in one pin of the AT89S8252 port1. how will these work? your response is highly appreciated! __________________ nedzamba thendo biko

9th December 2003, 12:04 PM	(permalink)
kinjalgp	Can you re-frame your question? I am not able to udersatnd what you are asking. __________________ "There is no way to peace, peace is the way!"

9th December 2003, 12:11 PM	(permalink)
thendo	AT89S8252 Me again! i'm asking if it's possible to use a pin as an input and output at the same time. my input is a switch and my output is a base of a transistor(To select one of the 7-segment displays). 1-PIN = 1 SWITCH + 1 TRANSISTOR. how will it work? __________________ nedzamba thendo biko

9th December 2003, 02:41 PM	(permalink)
ivancho	It might depend on what type of transistor you use and what state the pin is when the switch is close..... It might work as long as you make sure that the switch doesn't trigger the transistor. Ivancho

9th December 2003, 04:24 PM	(permalink)
kinjalgp	Yes it is possible through multiplexing. See this schematic and code. It just does what you are looking for : http://chaokhun.kmitl.ac.th/~kswichi...-seg/7-seg.htm __________________ "There is no way to peace, peace is the way!"