the Espruino http://www.espruino.com/Bangle.js emulator https://www.espruino.com/ide/emulator.html is really a great tool to get you going: you have 5 input buttons and a 240x240 pixel color display which give you a powerful UI infrastructure, and the blinking of LEDs - the typical Espruino red LED1 and green LED2 - is emulated as red and green 'fat' dots. And the best of it: it is all integrated into the IDE, including the console, which allows to query (and modify) just everything (even) while the code is running.
When it though comes to IoT - measuring things, controlling things and communicating - you have to get an Espruino device. The most suitable devices are the http://www.espruino.com/Pixl.js or https://www.espruino.com/WiFi. Pixl.js has a ui - display and buttons - and can communicates with Bluetooth. Espruino-WiFi can securely - https - communicate via wireless local area network with the WWW. You can also setup it up an access point to run its own wifi lan. Running a Web server - all part of the Espruino ecology - and writing a simple Web application gives you a UI in a browser.
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