Automatically generate random letters after typing

Hello everybody,

I'm trying to build a macro for a friend to teach him how to type blindly.
Herefor i want to let a random letter pop up in cel B5 after clicking on the 'START' button. After this the person has to type the letter in cel C5.
If the typed letter is correct then the next letter pops up in cel B5, automatically. If the letter is typed wrong, cel B5 turns red and the person typing has to try again until it is right, then the back color of cel B5 turns white again.

To start the 'program' the person has to press the 'START' button only once, in the beginning.

Some things already work. Each time i press the START button, a random letter is generated in cel B5.
What doesn't work is the 'automatic' part. If i press START the program should sustain and keep going.

Can anyone help me with this?

Thanks in advance.

Bjorn

You could add this to the sheet module

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