Sonoff NSpanel – first impressions!
Sonoff just introduced the NSpanel, a brand new 2-gang smart (Wifi) wall switch combined with a 3.5″ HMI touchscreen with a resolution of 480×320 pixels. There are 2 versions available, one for the US market, and one for the EU. Sonoff was kind enough to send us the EU version for review. Thank you Sonoff!
The heart of the Sonoff NSpanel is a ESP32-DOWD V3 with 4MB of flash memory. That’s great news! Some time ago Sonoff released the Sonoff Dual R3, which runs the same MCU.
Chip is ESP32-D0WD-V3 (revision 3) Features: WiFi, BT, Dual Core, 240MHz, VRef calibration in efuse, Coding Scheme None Crystal is 40MHz MAC: 94:3c:c6:c7:8a:24 Uploading stub... Running stub... Stub running... Manufacturer: ef Device: 4016 Detected flash size: 4MB
It supports Wifi and Bluetooth and Sonoff is again using the Bluetooth feature wisely, as they support BT-paring, which works great on the eWeLink app.
The Sonoff NSpanel has 2 physical switches that can switch 2 relays that support inching mode and interlock. According to the specifications the relays can handle 150W at 110V per Gang or 300W at 220V per Gang. The Relays used are rated 10A, so there is quit some headroom. The display is a 3,5″ 480*320px HMI touchscreen with a Toughened Glass plate. When we took the NSpanel apart, we noticed the STM32G031G8 32-bit Cortex® ARM MCU which leads us to believe there is an actual Nextion HMI Display inside, so it should be possible to have full esphome support for the NSpanel which would make it really useful for use with Home Assistant. The screen looks great, even at oblique viewing angles. Touch responds reliably and reasonably fast. Furthermore the Sonoff NSpanel features a NTC temperature sensor, and a reset button.
The quality of the panel seems to be quit decent. It’s frame is injection moulded plastic, and the “Toughened” glass front looks nice. The internal hardware is nicely screwed together. With exception of the display there is no glued parts and everything fits well. We like the fact that there is a header for 3.3v, TX, RX, GND and GPIO0 (no pins), which makes it easy to flash esphome on it. We have already backed up the original firmware and started the first experiments 🙂
esptool % esptool.py – chip esp32 – port /dev/tty.usbserial-0001 – baud 115200 read_flash 0x000 4194304 nspanel_backup.bin esptool.py v3.0 Serial port /dev/tty.usbserial-0001 Connecting....... Chip is ESP32-D0WD-V3 (revision 3) Features: WiFi, BT, Dual Core, 240MHz, VRef calibration in efuse, Coding Scheme None Crystal is 40MHz MAC: 94:3c:c6:c7:8a:24 Uploading stub... Running stub... Stub running... 323584 (7 %)
Another thing we noticed is that the NSpanel seems to feature a separate antenna for Wifi and Bluetooth. The Wifi reception is good.
The wiring of the NSpanel is the same as many other 2-gang switches
We have initially tested the Sonoff NSpanel using the original firmware and the eWeLink app. The pairing proces, using Bluetooth was a breeze. You’ll have this thing paired in no-time. The support for widgets still seems to be missing. We can’t be sure as we have no further Sonoff Hardware running original (eWeLink based) firmware. We will not focus much on the eWelink software as us “nerds” won’t go for anything less then esphome, Tasmota or HA SwitchPlate HASPone on our NSpanel anyway. 😉
Finding out all GPIO’s without destroying our sample tuned out to be a little tricky. For now we have the relays and buttons working using ESPhome. We did not manage to get the display working yet. We are reanonably sure GPIO 16 and 17 are used for TX/RX and since the original Sonoff firmware uses 921600bps for USART-updates, we are also quit sure the Baud Rate is correct. Nevertheless we keep getting “[W][nextion:072]: Nextion is not connected!” in the logs.
If anyone has more information on how to get the NTC temperature sensor and the Nextion display working, please post it in the comments below, or use the contact form.
Our preliminary config, now also includes the NTC and buzzer:
substitutions: devicename: sonoff-nspanel long_devicename: Sonoff NSpanel esphome: name: $devicename platform: ESP32 board: esp32dev comment: $long_devicename wifi: ssid: !secret esphome_wifi_ssid password: !secret esphome_wifi_password power_save_mode: light ap: ssid: $devicename password: !secret esphome_ap_password captive_portal: api: password: !secret esphome_api_password services: - service: update_nextion then: - lambda: 'id(display1)->upload_tft();' ota: password: !secret esphome_ota_password web_server: port: 80 logger: baud_rate: 0 level: VERBOSE uart: id: uart_1 tx_pin: GPIO16 rx_pin: GPIO17 baud_rate: 921600 display: - platform: nextion id: display1 uart_id: uart_1 tft_url: https://!secret homeasssistant_url/local/nextion/display.tft brightness: 25% lambda: |- it.set_component_value("gauge", 50); it.set_component_text("textview", "Hello World!"); # remove # below to enable ble tracking #esp32_ble_tracker: sensor: - platform: wifi_signal name: "$long_devicename - WiFi Signal" update_interval: 60s - platform: adc id: ntc_sensor pin: 38 attenuation: 11db update_interval: 5s - platform: ntc sensor: resistance_sensor calibration: b_constant: 3950 reference_temperature: 22°C reference_resistance: 10kOhm name: "$long_devicename - NTC Temperature" - platform: resistance id: resistance_sensor sensor: ntc_sensor configuration: DOWNSTREAM resistor: 10kOhm reference_voltage: 3.6V name: "$long_devicename - NTC Resistance" rtttl: output: rtttl_out output: - platform: gpio pin: GPIO19 id: relay1 - platform: gpio pin: GPIO22 id: relay2 - platform: gpio pin: GPIO4 id: displ - platform: ledc pin: GPIO21 id: rtttl_out switch: - platform: output name: "$long_devicename - relay 1" output: relay1 id: sw1 - platform: output name: "$long_devicename - relay 2" output: relay2 id: sw2 - platform: output name: "$long_devicename - display" output: displ - platform: template name: "$long_devicename - buzzer" turn_on_action: then: - rtttl.play: "test:d=4,o=5,b=100:16e6,16e6,32p,8e6,16c6,8e6,8g6,8p,8g,8p" binary_sensor: - platform: gpio pin: number: GPIO14 mode: INPUT_PULLUP inverted: True name: "$long_devicename switch 1" on_press: - logger.log: "$long_devicename switch 1" - switch.toggle: sw1 - platform: gpio pin: number: GPIO27 mode: INPUT_PULLUP inverted: True name: "$long_devicename switch 2" on_press: - logger.log: "$long_devicename switch 2" - switch.toggle: sw2
For now we have posted some pictures below. A full review will be published shortly.
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