TFT shield question and Analog pins question

Projects General Guidance
1

Hi, im using an Arduino mega with a TFT LCD Mega Shield V2.2. The shield esu too many pins. Can I use the remaining Analog pins has output? Example, I need to supply 5v to a sensor, can I do this:

pinMode(A0, OUTPUT);
digitalWrite(A0, HIGH);

to provide 5v constant to my sensor, without damaging anything?

Also, how can I use all the unused pins of the Arduino Mega?

2

Can I use the remaining Analog pins has output? Example, I need to supply 5v to a sensor, can I do this:

pinMode(A0, OUTPUT);
digitalWrite(A0, HIGH);

to provide 5v constant to my sensor, without damaging anything?

What "sensor"? I/O pins can only provide 40mA so you can't power much more than an LED. Some sensors don't require power. Some only require a pull-up resistor.

Normally if you need 5V power you use a 5V power pin. You can connect more than one thing to a 5V power pin.

Also, how can I use all the unused pins of the Arduino Mega?

I don't understand the question... You wire stuff up to them, set them up as either inputs or outputs, and either read-from or write-to them.