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THE SOTH JOURNAL

ESP & ESPHome

Ideas, know-how, and a little inspiration for your connected home.

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ESP & ESPHome

ESPHome fixes miscounted power readings from HLW8012 and BL0937 meters, mostly seen on Beken and Realtek plugs

Many cheap smart plugs measure power with an HLW8012 or BL0937 chip, which reports watts, volts and amps as streams of pulses. ESPHome counts those pulses with its software pulse counter, and on plugs built around Beken or Realtek chips under LibreTiny that counting has long been unreliable. Pull request #21271, merged into ESPHome's development br
Oct 22, 2026
3
min read

ESPHome 2026.11 makes sub-devices declare a relation, and configs without it will stop validating

If one of your ESPHome nodes uses the devices: list under esphome:, the next release will refuse to compile it until you add one line per sub-device. Pull request #21232, merged into ESPHome's development branch on 22 October 2026, adds a required relation: key to every entry in that list. The change is marked as breaking and is heading for ESPHome
Oct 22, 2026
3
min read

ESPHome 2026.11 gets a filter that corrects humidity from sensors in warm enclosures

ESPHome has a new sensor filter, rh_correction, that recalculates relative humidity after you correct the temperature of the same sensor. It was written by damib and merged on 22 October 2026 after review by J. Nick Koston (bdraco) and Jesse Hills. The code went into the dev branch, one day after ESPHome 2026.10.0 came out, and the documentation si
Oct 22, 2026
3
min read

ESPHome 2026.11 gets a VNC client that puts a browser dashboard on e-paper and LCD panels

A Home Assistant dashboard on an e-paper panel usually means rebuilding it in ESPHome's display lambdas or rendering screenshots on a server. ESPHome now has a third route. A new vnc component, written by Petar Petrov and merged into the development branch on 22 October 2026, connects to a VNC server and draws its screen on the device's display. A
Oct 22, 2026
3
min read

How to build a CO2 monitor with an SCD41 and ESPHome that stays accurate

Getting a CO2 reading out of a Sensirion SCD41 takes about ten lines of ESPHome YAML. Keeping that reading honest over months is the harder part. The sensor corrects its own drift with an algorithm that makes assumptions about your room, and if the room doesn't meet them, the numbers slowly move away from reality without any error in the logs. Wiri
Oct 22, 2026
10
min read

ESP-Mosaico: Espressif's ESP32-S31 kit with a square touchscreen, camera module and AI coding goes on sale for $59

Espressif's ESP-Mosaico can now be bought from the company's own Mosaico store. The Vision Combo Kit, with the core unit (board revision V1.2), a camera module and an interaction module, costs $59, and a battery module is offered separately for $15, according to CNX Software on 21 October 2026. Until now the kit had mostly turned up on Taobao and t
Oct 21, 2026
3
min read

ESPHome 2026.11 can run your own C program on the ESP32's low-power core while the main CPU sleeps

Battery-powered ESPHome nodes usually work in bursts: wake up, read a sensor, send the value, go back to deep sleep. A new esp32_ulp component gives them a third option. Merged on 21 October 2026 into the development branch for ESPHome 2026.11, it builds a small C program for the ESP32's low-power coprocessor, embeds it in the firmware and runs it.
Oct 21, 2026
3
min read