How many lcds can one Arduino/mega/esp32 support?

Projects Programming
1

Hi all.
Whats the maximum number of lcds or tfts can connect to one Arduino or MEGA or ESP32?

2

Well, work it out, for TFT displays;

Start with how many free IO pins a Mega or the ESP32 has.

You will need 3 pins to run an SPI interface.

Then each TFT will need at least 2, maybe 3 IO pins.

Then do the sums.

3

thanks.
is it ok to connect as many as need if there is I2C lcd module?

4
  • and memory to support whatever content you’re displaying,
5

As many as you like, using shift registers or port extenders.

6

great!
thank you.

7

Maybe.

But without a description of what it is you are actually trying to, what the projects actually is, its all guesswork.

8

In theory, you can do anything without any issue.
In practise it all depends on what harware you are using and how.
For example, you may see on your controller datasheet that your I2C bus can only use 3 devices per bus, which somewhat limits the maximum amount of LCD.
Or you may be limited by the amount of current you can provide without additional external source or even temperature managment
Etc.

But as far as I know, you should not run into any issue as long as you don't try to have hundreds of LCD lol.
If you think you need a bit more detail, please provide some more context on your project.

Have a nice day

9

it depends what library you are using and how many resources the rest of your code is using.
I have a project with 5 LCDs running and I assume even 10 wouldn't be a problem.