Superior 6000S LEH-S601S-WUS: ESP32-C3 hardware details, confirmed UART pins and initial working tests

[egoleos]

Hi! I have a Levoit Superior 6000S, model LEH-S601S-WUS, and would like to share hardware details and initial testing results to help add or validate support in this project.

Hardware

• Product: Levoit Superior 6000S
• Model: LEH-S601S-WUS
• PCB marking: CB-6000S V1.2
• Wi-Fi module: Espressif ESP32-C3-SOLO-1
• Chip detected by esptool: ESP32-C3, revision v0.4
• Flash: 4 MB, manufacturer 0x20, device 0x4016
• Crystal: 40 MHz
• Secure Boot: disabled
• Flash Encryption: disabled

Confirmed communication pins

Communication between the ESP32-C3 and the appliance MCU uses:

• ESP TX: GPIO19
• ESP RX: GPIO18
• Baud rate: 115200
• Format: 8N1

These pin assignments were identified through static analysis of the original firmware and subsequently used successfully on the actual device.

This hardware revision therefore needs different UART pins from the GPIO16/GPIO17 configuration previously suggested for SUPERIOR6000S.

Flashing

I flashed the original ESP32-C3 module using a CP2102 USB-to-UART adapter.

• Adapter TX → module programming RX
• Adapter RX → module programming TX
• Common GND
• 3.3 V power and UART logic
• Bootloader entry: GPIO9 held low during reset
• GPIO9 released after flashing, followed by a power cycle

The PCB has a pad marked IO0, but the ESP32-C3 download-mode input is GPIO9. The programming UART pads are separate from the GPIO18/GPIO19 appliance communication interface.

I will attach photos showing the board and my flashing connections.

Firmware used for initial tests

For these tests I used the external component from:
https://github.com/alxgmpr/esphome-levoit-6000s

Revision:
9d40a42a78f5dbafee7916fddf895d4bc7709d0e

Built with:

• ESPHome 2026.9.1
• ESP-IDF 5.5.5

This is a test of that component on LEH-S601S-WUS, rather than a validation of the SUPERIOR6000S implementation in tuct/levoit.

Results observed on the actual device

With the upper assembly connected but removed from the water tank:

• Temperature and humidity readings were received and updated.
• Tank missing was reported.
• Humidifying was inactive.
• Fan output was 0.

After reassembly and normal operation with water:

• Tank missing cleared.
• Low-water status was inactive.
• Auto mode was reported.
• Target humidity was 50%.
• Current humidity readings were approximately 43–46%.
• Humidifying was active.
• Nonzero fan output was reported.
• Filter life was reported as 93%.
• A Home Assistant command to select Auto mode was processed successfully.

These results indicate that basic communication and Auto operation work on this model.

In particular, the low-water flag being inactive while the tank was removed should not be interpreted as a successful low-water test.

Would these hardware details and test results help support this ESP32-C3 revision of the LEH-S601S-WUS? I can provide additional logs or perform specific tests if needed.

Attached are both stock application images, with all non-application flash regions omitted for privacy. These are analysis files, not a full recovery dump.

levoit-s601s-application-images.zip