I could also use an old raspberry and connect the BH1750 to its' GPIO pins, but I'm trying to minimize the number of devices I need to take care of. I have a Netgear R7800 (just AP, no router) in the attic next to the window, providing wireless access to the garden. So I thought that I could extend this device to provide outside light intensity values so that my home assistant installation knows when to close the roller shutters and to switch on the outside lighting. Currently this is done depending on the sun's altidude, but that does not take into account cloudy weather.
I have now ordered a digispark USB plug, a BH1750 and two 10k resistors and will try to get them soldered together (just 8 soldering points altogether). That should provide me with the hardware I was searching for.