Last December I started getting interested in "hardware stuff", and so I bought myself an Arduino, and started experimenting with it. Very quickly I moved over

Last December I started getting interested in "hardware stuff", and so I bought myself an Arduino, and started experimenting with it. Very quickly I moved over to using the ESP8266 chip, which is typically packaged in a small board with a bunch of breakout pins, just like the Arduino. The advantage of the ESP8266 chip, and the various packaged versions of it, is that it can be programmed via the same Arduino IDE, but it has on-board wifi-support. The board that I'm mostly using these days has 4Mb flash, and can easily be used to serve static & dynamic content from that space. The board I use is approximately 3cm x 4cm: https://wiki.wemos.cc/products:d1:d1_mini https://wiki.wemos.cc/products:d1:d1_mini That's not the smallest, and it wouldn't cope with SMTP-handling, but sending simple/static HTML/CSS/JS and processing HTTP POST submissions is entirely within its capabilities - and it'll only cost you €3 or so.