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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@Gordon
Hi!
JavaScript values take up more space than compiled code, but for instance if you were to make a big array you'd be able to allocate around 29kB (but you also have to share that space with program code).
Flash is accessed just by typing
save()- it saves all your program code and variables into flash. You can read/write it directly but it's not a good idea. It's shared with Espruino so you could easily overwrite it by accident!(2) Is this Hardware and the JS Interpreter free? Can it be used commercially (e.g. on boards I would make myself for some commercial projects)?
Yes. It's the MPLv2 licence for software and CC-BY-SA for the hardware. Basically you have to say your product contains Espruino, but you can't call your product an 'Espruino' without agreeing with us. It's a bit like Arduino really.
(3) Is there a way of creating uploadable programs that cannot be read by a customer? (If I want to provide updates for my own projects to the customers)
Customers can always connect via USB/Serial and read out what's on the chip, but you can 'minify' your code. That will generally rename all the variables/functions, remove all whitespace and comments, and often inline code - making it pretty much useless to anyone who'd try and read it.