Waveshare ESP32-S3-ETH issue

ESPHome
1

Hi, I try to use the ESP32-S3-ETH with a POE hat for the use of a soil moisture sensor.
First I tried to flash this with the ESPHome integration from HASS. That succeeded, and I had wireless connection.
I think I made an error with the configuration of the ethernet config. After I removed the wifi config and added the ethernet config, the device didn't react anymore to ESPhome.

Also the COM port disappeared after a while when I had the ESP connected. When I connected the ESP after a while, the com-port was active again. Flashing was still not possible by ESPhome, but only by esptool or web.esphome.io.

The last config I tried was the config below, which I saw on another topic on the HASS community.
Do I have a hardware failure? Or do I need to do other things with S3 devices than older ESP's?

esphome:
  name: moisture
  friendly_name: moisture
  platformio_options:
    board_build.arduino.memory_type: qio_opi
    board_build.flash_mode: dio
    upload_speed: 921600
    monitor_speed: 115200

esp32:
  board: esp32-s3-devkitc-1
  flash_size: 8MB
  framework:
    type: esp-idf
    sdkconfig_options:
      CONFIG_ESP32_S3_BOX_BOARD: "y"
  
psram:
  mode: octal
  speed: 80MHz

logger:
api:
  encryption:
    key: "xxx"
ota:
  - platform: esphome
    password: "xxx"
wifi:
  ssid: !secret wifi_ssid
  password: !secret wifi_password
  ap:
    ssid: "Moisture Fallback Hotspot"
    password: "***********************"
captive_portal:

web_server:
  port: 80

uart:
  id: mod_bus
  tx_pin: GPIO33
  rx_pin: GPIO34
  baud_rate: 4800
  stop_bits: 1

modbus:
  id: modbus1
  send_wait_time: 200ms

modbus_controller:
  - id: soil_sensor
    address: 1
    modbus_id: modbus1
    setup_priority: -10

sensor:
  - platform: modbus_controller
    modbus_controller_id: soil_sensor
    name: "Soil Humidity"
    id: soil_humidity
    register_type: holding
    address: 0
    unit_of_measurement: "%"
    value_type: U_WORD
    accuracy_decimals: 1
    filters:
      - multiply: 0.1

  - platform: modbus_controller
    modbus_controller_id: soil_sensor
    name: "Soil Temperature"
    id: soil_temperature
    register_type: holding
    address: 1
    unit_of_measurement: "°C"
    value_type: S_WORD
    accuracy_decimals: 1
    filters:
      - multiply: 0.1
2

What's the status with that configuration, exactly?

I cannot tell from experience for your device, but I generally would not use platformio_options and sdkconfig_options unless I know exactly why they are needed...

3

Here is a snippet of my Waveshare ESP32-S3-ETH that I used a few months ago.
You're missing the Ethernet chip (W5500) setup.

esphome:
  name: bt-proxy1
  friendly_name: BT Proxy1

esp32:
  variant: esp32s3
  flash_size: 16MB
  framework:
    type: esp-idf   
psram:
  mode: octal
  speed: 80MHz
  
#Using with Ethernet so commenting out WIFI
#wifi:
  #ssid: SSID
  #password: WIFIPASSWORD
# Enable fallback hotspot in case wifi connection fails
  #ap:
    #ssid: "Bluetooth-Proxy Fallback Hotspot"
    #password: BTProxyPassword

ethernet:
  type: W5500
  clk_pin: GPIO13
  mosi_pin: GPIO11
  miso_pin: GPIO12
  cs_pin: GPIO14
  interrupt_pin: GPIO10
  reset_pin: GPIO9
 #clock_speed: 26.67MHz
....
4

Thanks!

I tried the config, but it looks like it is in some kind of a boot-loop or something.
For a while I see a COM-port, but after a while it disappears. And the ESP won't react to anything.

Also if I have disconnected the ESP for a while, and I click it back in, the COM port appears again.

5

Do you have other devices connected to your Esp?

6

Nope, just the ESP

7

"While" sounds suspicious here. Did you try another cable?

8

I swapped the cable, and the ESP kept his COM port for a longer time now.
But when it is visible, I can flash the ESP. I now did flash it with the new cable also.
But I don't get an IP-address. Wired or wireless.

Logging gives no output.
Also without baud_rate 0.

I also don't see the link led blinking (yellow) only the act(green) is blinking.
Network settings are correct and tested.

Using Python 3.14.2 environment at: C:\Users\taren\.platformio\penv\.espidf-5.5.4
INFO Build Info: config_hash=0xe2024b61 build_time_str=2026-05-25 19:10:55 +0200
INFO Successfully compiled program.
esptool v5.2.0
Connected to ESP32-S3 on COM6:
Chip type:          ESP32-S3 (QFN56) (revision v0.2)
Features:           Wi-Fi, BT 5 (LE), Dual Core + LP Core, 240MHz, Embedded PSRAM 8MB (AP_3v3)
Crystal frequency:  40MHz
USB mode:           USB-Serial/JTAG
MAC:                3c:0f:02:d7:86:70

Stub flasher running.
Changing baud rate to 460800...
Changed.

Configuring flash size...
Auto-detected flash size: 16MB
Flash will be erased from 0x00010000 to 0x00077fff...
Wrote 425712 bytes (263341 compressed) at 0x00010000 in 2.7 seconds (1281.9 kbit/s).
Hash of data verified.
SHA digest in image updated.
Flash will be erased from 0x00000000 to 0x00005fff...
Wrote 20768 bytes (13278 compressed) at 0x00000000 in 0.2 seconds (692.3 kbit/s).
Hash of data verified.
Flash will be erased from 0x00008000 to 0x00008fff...
Wrote 3072 bytes (132 compressed) at 0x00008000 in 0.0 seconds (870.1 kbit/s).
Hash of data verified.
Flash will be erased from 0x00009000 to 0x0000afff...
Wrote 8192 bytes (31 compressed) at 0x00009000 in 0.0 seconds (2332.7 kbit/s).
Hash of data verified.

Hard resetting via RTS pin...
INFO Successfully uploaded program.
INFO UART logging is disabled (baud_rate=0). Not starting UART logs.