I need some advice as I have tried everything I know to no avail. I connect 1 1602a lcd as per instructions on web site and it works perfectly. I connect the 2nd lcd and only partial data shows. Now some of the data on the first lcd is incorrect. When I remove the second lcd the first is again correct. I have switched lcds and the same thing happens.

I have a 2 amp power supply for the Arduino 2560 and powering the backlits with a separate USB power.

I don't know what else to do and have been trying different things for weeks. I need some ideas.

Joey
in SimVimCockpit by

1 Answer

0 votes
Hi Joey,
on which pins do you have LCD1 and LCD2 (LCD control pin) connected to the Arduino2560?

Frank
by
0

Frank, It's absolutely  doesn't matter what pin you use for signal line.
It can be pin #3, 12.. as well as 60.. 69  (A..A15), there is no any difference for the program code.

Joey,

Please read the reworked powering/ground page again, maybe it will help. Take a note below about grounds.

http://simvim.com/tips_power.html


By the way, find the paragraph with " ...  it's pointless to use a high-power source to feed the Mega2560 board through the power jack ... "

Vlad

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