LCD and Max7219

Help please.
I can get each module to work seperately, but when I put together into one program.. nothing works properly.
Did a line by line elimination and when i commented out the Lcd.begin() line the dot matrix would work but not LCD.
Seems to me like a software clash and dont know what to do, and cant find a solution.
Contacted Arduino and they said seek help on form!
Very sad!
My email (removed by moderator)
Thx

Unless you read the instructions, we will probably never know! :cold_sweat:

We do not discuss matters via email, nor solicit. :astonished:

You have provided no information that we can use to help you.

What LCD?

What LED?

Post a schematic.

Post the formatted code in code tags in accordance with the instructions.

All of the recriminations mentioned above are appropriate but he actually has provided some useful information.

The Lcd.begin() instruction specifies the microprocessor pins that are used by the character mode display (16x2 etc). Since the display controlled by the MAX7219 works when the character mode display is disabled it appears that they are sharing one or more of the microprocessor pins.

If that is the case then the solution is to determine which pins are shared and then change the Lcd.begin() instruction so that it specifies unique pins for the character mode LCD.

Don

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