[WIP] ESPHome firmware

[DSpeichert]

The PCB can happily be operated via ESPHome firmware, which is native to Home Assistant (official ESPHome plugin is needed instead of MQTT server/bridge) thanks to its wide array of supported modules - in fact all of the ones used by this project.

This YAML currently includes support for:

• Relays - to control HVAC mapped as outputs
• Thermostat controller - the logic is executed locally, i.e. does not need Home Assistant to be online to operate, fully depends on AHT20 sensor for temperature
• OTA updates of firmware (HA/ESPHome native)
• Time sync - SNTP
• Piezzo buzzer - not used
• LD2410 motion/presence sensor via UART - currently not tweaked/tuned great but is used to light up the screen (like in original firmware)
• AHT20 via i2c - temperature and humidity - calibration is key and offsets can be significant, I've made them configurable in the HA UI via settings
• ADC light sensor - very crude but works for adjusting brightness (motion is for on/off, ADC is for brightness)
• Touchscreen - displays info, touch currently only wakes up screen but is calibrated and operational
• Serial improv - requires USB connection
• Logging onto secondary UART or ESPHome log (can't do both)

What I tried that didn't work:

• BLE-based improv protocol - takes too much RAM to operate BLE stack together with touchscreen

TODO before merging:

• Making the package work (or abandon the idea and simplify the YAML)
• Touchscreen buttons/menu
• Stability issues (sometimes loses connectivity to HA -> is it memory/firmware or just my HA?)
• Actions pipeline should build firmware without keys or WiFi password -> ready to be initialized via serial improv

[smeisner]

@DSpeichert Please encapsulate any code changes in the firmware with "#ifdef ESPHOME" as is already done with MATTER and MQTT.

[DSpeichert]

@DSpeichert Please encapsulate any code changes in the firmware with "#ifdef ESPHOME" as is already done with MATTER and MQTT.

There will be no changes to the firmware in app/ in this project. The ESPHome firmware is effectively generated with just the YAML I provided here by the esphome tool/project. Therefore, those two are completely independent in this repository.

[smeisner]

Yeah, makes sense ... I should've gave it some thought first!! :P

[smeisner]

Need to include:
invert_colors: false

[smeisner]

I tried this in a clean directory (ie, not a git cloned area) and it failed as the ../app/default_16mb.csv file was missing. After supplying that (and making the to the device yaml file mentioned below), it worked and reprogrammed the device.

[smeisner]

So far, I can verify the display works (but not necessarily the touch screen) and the motion sensor. I do not see any way to exercise the other areas that are believed to be supported though (like the touch screen, status LED, light sensor, the piezo or the relays).