Arduino UNO + ethernet+PWM breakout +backpack + LCD shield with keypad

[patrikk]

I was wondering if it would be posible to connect Arduino UNO to ethernet to PWM breakout to backpack to LCD shield with keypad?

To be a bit more specific: It seems like it shouldn't be any problem except for the A4 and A5 pins that both the PWM breakout and the backpack wants to use. Can this be done ( to have all of them connected)?.

if it is. what would some sample code look like to access the lcd (if the lcd is the last component to be connected). the PWM break out has a tutorial for that if its connected to the Uno/Ethernet shield so I guess its only the buttons and display that makes me wonder.

[adafruit_support_rick]

A4 and A5 are used for an I2C bus, in which multiple devices share the same two data lines. So there is no conflict between the PWM and the LCD shield!

[patrikk]

Thats great thanks!

Now to the more difficult part, obtaining a LCD with buttons from Adafruit they are all sold out.

[patrikk]

A follow up question. As the RGB LCD with buttons are sold out and I do not have the patience to wait I guess I need to settle for the single colored one.
So to the question:

Looking at this product:
http://www.adafruit.com/products/772

the description mentions that it uses only two pins. so I guess I can use it as a break out and only connect it to ( I guess A4 and A5?) and to the power and ground is that a correct assumption? I do not want it to be a shield solution as Im trying to keep a minimal height.

[adafruit_support_rick]

Yes. This page covers detached usage

[patrikk]

thank you for the confirmation and the link