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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
I think you probably want to use the HY board because of the LCD and touchscreen as well?
But if you're using an Apple device and you don't want to use WiFi, your only other option is Bluetooth Low Energy.
You could get one of these: https://www.adafruit.com/product/2479
Adafruit has an app with some buttons and a colour picker on it, but if that doesn't do what you want, you'd have to make your own iPad app - which could be a bit painful?