Box is a Pi Zero in a plastic junction box, on the shelf above the door.
- BME280 on i2c, address 0x76, cable is 30cm which is about the limit before it gets flaky
- writes to local sqlite, porch box pulls over ssh every hour
- condensation got inside once, drilled two small holes in the bottom, no problem since
- SD card is on its second year. Should probably replace before it fails and not after
- read-only root would be nice, haven't done it