esphome

Installation

https://nixos.org/download/
direnv

Your PC timezone is important for esphome schedules, as they will use compiler's timezone when syncing the clock (NTP).

Compiling

$ cp -i secrets.yaml{.sample,}
$ cp -i templates/secrets.yaml{.sample,}

# Edit both secrets.yaml files.

# Compile all devices in parallel (up to 4 jobs)
$ nix develop --command make compile-all -j4

# Or compile a single device
$ nix develop --command make compile-bathroomheater

Flashing

To flash all devices (automatically prioritizes OTA and skips prompts):

$ nix develop --command make flash-all -j4

To flash a single device:

$ nix develop --command make flash-bathroomheater

Alternatively, you can drop into the development shell and run esphome directly:

$ nix develop
$ esphome run bathroomheater.yaml

Note: The Makefile automatically tracks dependencies (including !include files and local external_components directories). It will natively evaluate changes and only recompile what has actually changed since the last run.

Running remotely

If you don't have esphome installed on a computer that you connect ESP chip to, use https://web.esphome.io/ to upload the compiled binary.

The binary resides in .esphome/build/<component>/.pioenvs/<component>/firmware.factory.bin.

Serial console

Use screen /dev/tty.usbserial-0001 115200 (or /dev/ttyUSB*) to read the console.

Cleaning up removed MQTT entities

This can be done via clean-mqtt command line:

$ esphome clean-mqtt spare-power-meter.yaml \
    --topic homeassistant/binary_sensor/<component>/<entity>/config

$ esphome clean-mqtt spare-power-meter.yaml \
    --topic homeassistant/+/<component>/#

When --topic is specified, the YAML file will only be used to extract MQTT credentials. All other topics will remain untouched.

Hardware: heating

Photoresistor

Schematics:

A0 -> 10K Ohm -> GND
A0 -> Photoresistor -> 3V3

Assembly:

Put isolation band on the legs
Solder legs to dupont wire (the other end has to be male)
Bath it in the insulation varnish
Think the isolation band with a fan

Color coding for RJ45 cable:

orange: furnace
blue: floor

5528 photoresistor: 8-20K resistance by brightness, up to 1 MOhm. Brightness range is 1.47 - 2.2V. Darkness is 3.267V.

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