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I like showing people how to hook up ESP8266s to the OpenWeatherMap API[1] - it's a quick and useful example and it seems to get people thinking about home automation. One fun way to display the results very cheaply is to use just a few of those colored LEDs for things like temperature ('blue->yellow->red') and conditions (yellow for sunny, grey for overcast, blue for rain, etc.)
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Are there any good low cost logic analyzers you know of? I've never had a big enough, or time dependent enough project to require anything more than a multimeter and patience, so I've not put the cash forward for a logic analyzer, or oscilloscope, or whatever. Not entirely sure what the difference is anyways...
If you want to go for lowest cost possible, you can find tons of cheap hardware on AliExpress (search for "8ch logic analyzer", they go around 10 bucks). While these vendors usually just tell you to use Saleae's software, you can and should use the awesome open-source Sigrok ( https://sigrok.org ) tool, which supports these knockoff clones!