Another problem is that I cannot use these shields together since there are pins conflicts. I'm planning to connect two arduinos using i2c but it interferes with the keypad pin A4-5. How do I make this work?
Your keypad/lcd shield is using 13 pins out of 18 available arduino pins. There is no way you can use it for any realistic project involving more hardware. Use a serial LCD and keypad to possibly reduce pin count and you may get to pick the keypad connections (8 pins if you connect directly to arduino).
Thanks for the input. I think I might get your keypad instead. But theoretically, it is kind of like having another microcontroller with a keypad with it :). Now I just have to solve some problem with the motor controller.
eigenz:
Thanks for the input. I think I might get your keypad instead. But theoretically, it is kind of like having another microcontroller with a keypad with it :).
eigenz:
Do you by any chance which arduino pins are used for the kit?
The backpack uses all ATMEGA328 pins except for analog 4,5. That is not your concern since these pins are the pins on the on board ATMEGA328, not your Arduino pins. Your Arduino only needs 2 pins to connect to the panel.