Yup ErnieM,

I was thinking about this "when to start to wave" problem.

This is also why I would have appreciated to get some code examples...

In all website (many thanks to MisterE 'cause I didn't know how to call this type of gadget before his post) where I could find information, there is no mention about a mouvement sensor in the case of handheld models.

My assumption was to repeat the message sequence endlessly and you modulate the wave speed to make it readable.

Or is it not that way it works?

So, if anybody else knows...