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 600S - Custom Firmware (ESPHome)

Quick Facts

Item Value
Model Core 600S
Tested MCU FW 2.0.01
ESP Module ESP32-C3-SOLO-1
Fan Speeds 4
CADR (spec) 641 m³/h
Room Size 9–147 m² (97–1,582 ft²)
ESPHome 2026.1.2+
PM Sensor Luftme LD15

Features

Feature Type Notes
Fan fan 4 speeds, presets: Manual / Auto / Sleep
Auto Mode select Default / Quiet / Room Size / ECO
Auto Mode Room Size number 9–147 m²
Display switch Toggle LED display
Child Lock switch  
Light Detect switch Auto-dims display when ambient light is low
PM2.5 sensor µg/m³
AQI sensor As reported by MCU
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  
Error text_sensor “Ok” or “Sensor Error”

Teardown / Disassembly

TODO: add teardown steps and photos

Wiring New ESP

TODO: add wiring photos and pin mapping

Flash

Prerequisites

The Core 600S uses an ESP32-C3-SOLO-1 on the original board. It is recommended to replace it with a new ESP module.

Recommended modules:

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

Configure

  1. Copy secrets-example.yaml → secrets.yaml and fill in your Wi-Fi and encryption key
  2. Choose the config matching your replacement module

Flash

esphome run levoit-core600s-c3.yaml

esphome run levoit-core600s-s3.yaml

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-core600s-builder-solo-1c.yaml original ESP32-SOLO-1C
levoit-core600s-builder-c3.yaml ESP32-C3 replacement
levoit-core600s-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.

Backup Existing Firmware

esptool read_flash 0 ALL levoit-core600s-backup.bin

Restore Original Firmware

esptool erase_flash
esptool write_flash 0x00 levoit-core600s-backup.bin

Teardown / Disassembly

Remove the base and filter from the upper assembly. Turn upside down.

Levoit Core 600S Underside

Remove the screws highlighted in green. You can also remove the screws highlighted in blue to remove the fan grille and gasket piece to make removing the fan less unwieldy. In that case, the PM2.5 sensor will be lose so be careful.

Levoit Core 600S Upper Inside

To release the fan, remove the screws hidden behind plastic plugs in each of the handle.

Levoit Core 600S Handle Screws

Then pop the handles out and carefully slide the fan assembly out slightly. There are a couple of cables connecting to the control board which is clipped into the top fan grille. Luckily the holes left by the handles make it relatively easy to unplug these from the connectors on the control board.

Levoit 600S Access Hole

Carefully unplug these cables before pulling the fan assembly out.

Levoit 600S Unplugging Cables

That will get you access to flash the ESP32.

Levoit 600S Top Case

They were nice enough to silkscreen the ESP32 programming header on both sides so you don’t even need to remove the board from the case if you don’t want to. Make note of which ESP32 you have if you’re not going to replace it. ESP32-C3-SOLO-1 and ESP32-SOLO-1C have been found so far.

The header for the ESP32 is highlighted in blue. Connect your UART adapter here, making sure you get TX and RX the right way around. TX and RX on this board are TX and RX of the ESP32. Sometimes they’re labeled to match your adapter. Note that it’s 3V3 not 5V.

The header for the microvontroller is highlighted in yellow. This is not what you’re looking for if you’re looking to flash esphome.

Levoit 600S Control Board

Protocol Notes

Same UART protocol as Core 300S/400S with these differences:

  • Status push: CMD=01 40 41 (vs B0 40 / 30 40 on 300S/400S)
  • ACK uses 0x52 response type (not 0x12) with trailing byte 0x01
  • Light Detect command: CMD=01 E9 A5 PAY=01/00
  • 4 Auto Mode options: Default (00), Quiet (01), Room Size (02 + room_size LE), ECO (03)
  • Status byte layout: display [8], AQI [11], PM2.5 [12-13], child lock [14], auto mode [15], room size [16-17], light detect [21]
  • Room size encoding: raw = sq_ft × 3.15 (MCU uses scaled sq ft)