A WeMos D1 Mini-based computer for reading temperature/humidity data from up to four SHT20 and reporting it over the network using MQTT and/or the HELO protocol.
EnvironmentalSensor2021 v0.0.12.
TODO: Note features; IPv6-only (disabling IPv4 by hardcoding a dummy probably-not-on-your-network address), HELO, MQTT, serial control, what the button does.
Can talk to up to four SHT20s over I2C by using four separate pins for SDA and sharing one SCL between them all. I wasn't sure if this would work, but it does seem to.
A SSD1306 screen can also be attached to the first I2C bus.
TODO: Assembly notes
- TOGRack2!
- Hot glue to hold the screen in -- don't break it with screws!
TODO: Link to STL files
TODO: Note that 'you don't need to configure it', because WiFi can be connected over serial
- not sure if this is as reliable as hardcoding a list, though
Label making process (also in comment in PNG file):
- Generating QR code in https://www.qr-code-generator.com/
- Screenshot
- Load into GIMP
- Scale to one dot per pixel
- Extend canvas to make room for border and label
- Scale up to 300DPI
- Add label
- Print, stick to panel?
- Hope I didn't mess up the item number
- But I did superglue it on upside-down and then
had to print another one to superglue over the first one!
It would be cool to have a more streamlined way to make QR code/label PNGs/PDFs.
