Hello,
What would be the fastest display for an Arduino Mega 2560 (time <100 ms)? Size and price do not matter much for my project, but it should not be very bright if possible. Speed is most important for my purpose and if an additional shield would be needed, I would also appreciate information on which would be a suitable one.
Many thanks.
Since you have not specified either the type of display or the resolution, I will suggest a OLED 0.96 - its speed will certainly fit your conditions.
Welcome to the forum.
Why do you want a fast display ? Maybe writing to the display does not get in the way of the fast things that you want to do. Can you tell more about your project ?
The fastest display is without I2C bus and without Serial bus, just a bare LiquidCrystal display: https://docs.arduino.cc/learn/electronics/lcd-displays
We advice not to do that. It is a struggle to get it working for the first time with all those wires and it uses many pins. It was a struggle for me as well.
a LED connected to an Arduino pin.
Seriously, you should define what requirements you have for your display. A refresh rate within 100ms - fine ... but what do you want to display? One binary attribute --> use a LED. A number? Some alfanumeric text (how many characters, how many rows), a grafic?
As already mentioned... if there are I2C variants of displays they might be (much) slower than other buses, so don't take I2C as your first choice.
Thanks for the hint!
I plan to record a scene with a camera and display some sort of code (like QR code or LED combination) once an event on a computer or tablet occurs. Just based on the code, I could then see in the video what event occured.
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Thanks!
I think I would be quite flexible there, but you are right - a binary attribute would not be an option for me. I plan to record a scene with a camera and display some sort of code (like QR code or LED combination) once an event on a computer or tablet occurs. Just based on the code, I could then see in the video what event occured.
Displays are meant to be looked at with a human eye 
They have often some kind of multiplexing or scanning or PWM.
To be sure that you can capture it, I think you have to use leds. @noiasca is right, that is the best option. Can you connect 16 leds with resistors to the Mega board ? If you put them in a 4x4 matrix, then they need only a little space.
With 16 leds you have 65536 possible patterns.
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