I need to throw out all of my power only usb cables.
Noting quite like wasting time trying to get something to work when the issue is using a power only micro-usb cable 
@kr4dio I have a few sonoff light switches I've flashed with esphome. Seems like shoving a temperature sensor in there would be an option but I can't find anyone having done it...
@M0YNG It looks like some people remap the rx/tx serial pins to i2c and use that to interface with sensors. Plain esp8266 boards are so cheap, though
@kr4dio they are, but if I've already got one attached to the wall it seems easier and neater to not have another device needing power etc.
@M0YNG #espHome adding environmental sensors to #homeAssistant too easy. Here's my living room air quality setup: