Olimex ESP32-PoE-ISO epaper and Ethernet not working together

ESPHome
1

Hello,

i am working on a little Project using the Olimex ESP32-PoE-ISO WROOM and a Waveshare 7.5" Epaper with the e-Paper Driver HAT.

I want to integrate this into Home Assistant over ESPHome.

The Setup is working while using WiFi but as soon as I switch to Ethernet it stops working.
In the Serial Monitor i get following Error:
"
[12:55:12]E (47362) task_wdt: Task watchdog got triggered. The following tasks did not reset the watchdog in time:
[12:55:12]E (47362) task_wdt: - loopTask (CPU 1)
[12:55:12]E (47362) task_wdt: Tasks currently running:
[12:55:12]E (47362) task_wdt: CPU 0: IDLE
[12:55:12]E (47362) task_wdt: CPU 1: loopTask
[12:55:12]E (47362) task_wdt: Aborting.
[12:55:12]
[12:55:12]abort() was called at PC 0x400ec1b9 on core 0
[12:55:12]
[12:55:12]
[12:55:12]Backtrace:0x400836a1:0x3ffbe83c |<-CORRUPTED
[12:55:12]
[12:55:12]
[12:55:12]
[12:55:12]
[12:55:12]ELF file SHA256: 0000000000000000
[12:55:12]
[12:55:12]Rebooting…
"

This is my Code at the moment:

esphome:
  name: esphome-web-9361a8
  friendly_name: Epaper
  min_version: 2025.5.0
  name_add_mac_suffix: false

esp32:
  board: esp32-poe-iso

# Enable logging
logger:

# Enable Home Assistant API
api:

# Allow Over-The-Air updates
ota:
- platform: esphome

ethernet:
  type: LAN8720
  mdc_pin: GPIO23
  mdio_pin: GPIO18
  clk_mode: GPIO17_OUT
  phy_addr: 0
  power_pin: GPIO12
  
font:
  - file: "Arial.ttf"
    id: my_font
    size: 20
spi:
  clk_pin: GPIO14
  mosi_pin: GPIO4

display:
  - platform: waveshare_epaper
    cs_pin: GPIO13
    dc_pin: GPIO15
    busy_pin: GPIO32
    reset_pin: GPIO5
    model: 7.50in-bV3-bwr
    update_interval: 40s  
    id: my_display
    lambda: |-
      it.print(10, 10, id(my_font), "Hello World!");
      it.print(10, 40, id(my_font), "Test:");

I hope someone can help me this.

Thank you
djkroko

2

Hi

As documented on ESPHome website, ESPHome doesn’t support Ethernet and Wifi so far unhappy, you have to decide the one you want to use :frowning:

Vincèn

3

Oh, then my Post was a bit unclear.

When I switch to Ethernet, I disable WiFi.

4

Double check Ethernet connections

5

If I delete the Display component, Ethernet works.

So I guess its something in combination with Ethernet and Display-

6

So just tried something.

I removed just the lamda Code under the Display section and the ESP runs without Problem.

If i readd the lamda code I get the known behavior with restarts.

Edit:
So as soon as I use lambda Code for Text the esp reboots with the error from first Post.

I can draw lines or use the color test card, they work without any Problems