how to control multiple Inputs and outputs ??

Projects General Guidance
1

Hello.

I'd like to control multiple Inputs and outputs, like a Parking lot

LEDs are always Greenlight. and If CDS photoresistor-1 get darkness then LED1 has to be a RED light.

But I think this way will Occupy Pins of ARDUINO too much. So I wanna change this connecting way by

another way. I considered a shift resistor, but there are so many variables.

Is 1:1 connection the best? what do u guys think? Give me some advice.

thank to read this

2

Almost the first thing to be done is to make a list of ALL your digital and analog inputs & outputs, operator interface devices, display devices, communication links and anything else the processor will need to control/respond to. This will give you an idea of which Arduino is best suited.

Have you read how to use this forum?

3

You may want to arrange your sensors and LEDs in arrays. See "keyboard" and "LED cube" projects in the forum or web.