SONOFF April 2026 7 min read Smart Home Hellas

What is the NSPanel EU?

The SONOFF NSPanel EU is a smart wall panel with a 3.5-inch touchscreen that fits into a standard switch cutout. It features 2 independent Wi-Fi relays, a thermometer and the ability to display a custom dashboard.

With stock firmware it works via the Ewelink cloud. With ESPHome it becomes fully autonomous and integrates directly with Home Assistant — no cloud, no subscription.

SONOFF NSPanel EU — smart wall panel with a 3.5-inch touchscreen
SONOFF NSPanel EU: 3.5" touchscreen, 2 relays and a temperature sensor in a standard switch cutout.

Important: Flashing with ESPHome requires opening the device and connecting UART cables. If you're not comfortable doing this, contact us for professional installation.

What you need

  • SONOFF NSPanel EU
  • USB-to-UART adapter (e.g. CH340 or CP2102)
  • ESPHome Dashboard (via Home Assistant add-on)
  • A few jumper wires

Flashing with ESPHome

Open the NSPanel by removing the 4 screws from the back. Locate the UART pins (TX, RX, GND, 3.3V) on the PCB. Connect the UART adapter and enter flash mode by holding the boot button while applying power.

The NSPanel EU opened: the main board with the ESP32 and the display ribbon cable
The NSPanel opened: the main board with the ESP32 and the display ribbon cable.
NSPanel board pinout: ESP_TX, ESP_RX, 3V3, GND pads plus GPIO0, GPIO14, GPIO27 and the relay GPIOs
The UART pads (ESP_TX, ESP_RX, 3V3, GND) and GPIO0 for flash mode, as we labelled them on the board. Click to enlarge.

In the ESPHome Dashboard create a new device for NSPanel, select the correct serial port and click Install. The process takes 2–3 minutes.

NSPanel connected through a UART adapter to a laptop during the first ESPHome flash
The first flash goes over UART: the NSPanel wired to the laptop with the ESPHome Dashboard open.

Home Assistant Setup

After flashing, the NSPanel appears automatically in Home Assistant as an ESPHome device. You have full control:

  • The 2 relays as separate on/off entities
  • Room temperature from the built-in sensor
  • Custom display via ESPHome display components
  • Physical buttons as triggers for automations
NSPanel with a custom ESPHome screen: room temperature 19.8°C, target 21.0°C and heating indicator
After flashing: a custom ESPHome screen with room temperature, target temperature and heating state — this is how our SHH-NSPanel thermostat works.

Video guide: Watch the full guide on our YouTube channel.

Watch on YouTube →

Conclusion

The NSPanel EU with ESPHome is one of the most impressive upgrades for a smart home. It replaces a simple switch with a full control panel displaying time, temperature and controlling anything you want in Home Assistant.