First arduino project, please help.

Ok, so i started a project utilizing arduinos (2x) (havent decided to go uno or mega yet)

My quesion is while using a tft screen and an adapter shield is there any way to expand the board?

I have ran out of pins. my project requires 15 output pins and 5 input pins(some analog and some digital) other than what are being used buy the tft screens.

is there anyway to make 2 or 3 arduino boards communicate with eachother instantly?

example: if arduino board(1) reads a digital signal into pin 5

then arduino board(2) reads that arduino board(1) has recieved the signal so it sends a 5v output to a relay via pin 8?

I have yet to purchace my arduino boards, I would like some input about what would be the best way to do this.

Any help would be greatly appreciated, Thank You.

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alanwood over 13 years ago

Hi Anthony,

The Arduino Mega should fulfil your requirements.

The site quotes "The Arduino Mega is a microcontroller board based on the ATmega1280. It has 54 digital input/output pins (of which 14 can be used as PWM outputs), 16 analog inputs, 4 UARTs (hardware serial ports), a 16 MHz crystal oscillator, a USB connection, a power jack, an ICSP header, and a reset button."

This should leave plenty of I/O after the shields are fitted. Can you let us know which TFT and adaptor shields you are using please?

Have fun!

Alan
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e14 Contributor over 13 years ago in reply to alanwood

Thank you for your response, Alan.

The below linked is the tft screen that i have picked i will be running 2 of them unless i can find a decent 5" screen then ill just run that

http://www.colorapples.com/32-tft-lcd-screen-module-p-88877.html#.UflbFI1ONic

And, the below link is the before said tft adapter shield.

http://www.ebay.com/itm/TFT-SD-Shield-for-Arduino-DUE-TFT-LCD-Module-SD-Card-Adapter-2-8-3-2-inch-Mega-/121057447668?pt=LH_DefaultDomain_0&hash=item1c2f960ef4

Idk if it is needed to have the sd card slot to pull graphics off of i just assumed that would be easiest on the board.

this project will be running a good portion of my project car. including; blinkers, enigne on\off, heater controls, vent controls, hazard lights, windows, defrost defog, and other misc things around the vehicle. quite a big project but willing to put the time and effort into making it work.
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e14 Contributor over 13 years ago in reply to alanwood

Thank you for your response, Alan.

The below linked is the tft screen that i have picked i will be running 2 of them unless i can find a decent 5" screen then ill just run that

http://www.colorapples.com/32-tft-lcd-screen-module-p-88877.html#.UflbFI1ONic

And, the below link is the before said tft adapter shield.

http://www.ebay.com/itm/TFT-SD-Shield-for-Arduino-DUE-TFT-LCD-Module-SD-Card-Adapter-2-8-3-2-inch-Mega-/121057447668?pt=LH_DefaultDomain_0&hash=item1c2f960ef4

Idk if it is needed to have the sd card slot to pull graphics off of i just assumed that would be easiest on the board.

this project will be running a good portion of my project car. including; blinkers, enigne on\off, heater controls, vent controls, hazard lights, windows, defrost defog, and other misc things around the vehicle. quite a big project but willing to put the time and effort into making it work.
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