Project - Free Levoit Air Purifiers

Collection of custom ESPHome firmware and hardware projects for Levoit air purifiers, eliminating cloud dependency and enabling native Home Assistant integration.

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Levoit Core 200S - Custom Firmware (ESPHome)

Quick Facts

Item Value
Model Core 200S
Tested MCU FW 2.0.11
ESP Module ESP32-SOLO-1C
Board EH-BY-41916-C-V1.0 (SinOne)
Fan Speeds 3
CADR (spec) 167 m³/h
Room Size up to 40 m² (430 ft²)
ESPHome 2026.1.2+
PM Sensor None

Features

Feature Type Notes
Fan fan 3 speeds, presets: Manual / Sleep
Display switch Toggle LED display
Child Lock switch  
Night Light select Off / Mid / Full
Current CADR sensor m³/h, updated every 5s
Filter Life Left sensor % remaining
Filter Low binary_sensor On when < 5%
Filter Lifetime number Configurable in months
Reset Filter Stats button Resets CADR/runtime counters
Timer number Run timer in minutes
MCU Version text_sensor  

No PM2.5 / AQI sensor on this model. No Auto mode.

Teardown / Disassembly

  • Place upside down, remove base cover and filter to expose screws
  • Remove all screws — they are soft metal, do not overtighten when reassembling
  • Slide a pry tool between the tabs to separate base and top sleeve, the top should go inside
  • Unscrew the logic board / top module
  • Unplug the logic board

Teardown

PCB

PCB back

PCB front

Replacing the original ESP32 lets you keep the original firmware intact and switch back easily.

Wiring (ESP32-S3 example):

PCB ESP32-S3
EN GND
3.3V 3.3V
GND GND
RX GPIO05
TX GPIO04

PCB ESP32-S3 wiring

Pull the EN pin of the original ESP32 to GND to disable it.

Recommended modules:

  • Seeed XIAO ESP32-C3
  • Seeed XIAO ESP32-S3

Placement of new ESP

No room to fit the esp32! i placed mine outside in the airstream. I had to break out a small part to get the wires through.

custom esp

custom esp

custom esp

custom esp

custom esp

custom esp

Flash Original ESP32

Prerequisites

Solder wires to TXD0, RXD0, IO0, +3V3, GND near the ESP32 on the logic board and connect to a USB-UART converter (3.3V TTL).

Connect IO0 to GND before powering on to enter bootloader mode.

Backup Existing Firmware

esptool read_flash 0 ALL levoit-core200s-backup.bin

Note: backup may fail on some boards — proceed at your own risk.

Configure

  1. Copy secrets-example.yaml → secrets.yaml and fill in your Wi-Fi and encryption key
  2. Adjust the device name in the config if running multiple units
  3. Check the component README for UART pin mapping per board

Flash

esphome run levoit-core200s.yaml

Reassemble and enjoy!

ESPHome Web Builder / Dashboard

Use the pre-generated builder yaml to flash without a local clone — all config is inlined, no !include or packages needed:

File Board
levoit-core200s-builder.yaml original ESP32-SOLO-1C
levoit-core200s-builder-c3.yaml ESP32-C3 replacement
levoit-core200s-builder-s3.yaml ESP32-S3 replacement

Upload to the ESPHome web builder or paste into the ESPHome dashboard. Regenerate with .\make-builder-yaml.ps1 from the devices/ folder.

Restore Original Firmware

esptool erase_flash
esptool write_flash 0x00 levoit-core200s-backup.bin