Reflashing Deltaco Smartplug SH-P01 to Work With Home Assistant

Note! This document is not valid any more. The SH-P01 devices I purchased on late 2021 were running a patched firmware. Thus, the Tuya-convert is not able to flash the SH-P01s.

This is a documentation of a ongoing work where I’m trying to get Deltaco Smartplug SH-P01 to work with Home Assistant.

Since the Home Assistant does not have a native support for the device I’m planning to:

  • Create an ESPhome firmware with the configuration I found from the Home Assistant discussion board
  • Flash the firmware with tuya-convert
  • Finally, control the device with Home Assistant

Creating ESPhome Firmware

Since I already had Docker installed on my laptop I entered

docker pull esphome/esphome

and got the ESPhome Docker image. After this I created relay_1.yaml with following content:

esphome:
  name: relay_1
  platform: ESP8266
  board: esp01_1m

# Your WiFi SSID and passphrase is defined here
# https://esphome.io/components/wifi.html
wifi:
  ssid: "YOUR_WLAN_SSID"
  password: "YOUR_WLAN_PASSPHRASE"

# Enable fallback hotspot (captive portal)
# In case the device can't connect the host defined above
# it starts to work as an access point with these settings
# https://esphome.io/components/captive_portal.html
  ap:
    ssid: "Smartplug Deltaco 1"
    password: "RANDOM_PASSWORD_NEEDED_IN_CASE_THE_DEVICE_CANT_CONNECT_WLAN"

captive_portal:

# Enable logging
logger:

# Enable Home Assistant API
# https://esphome.io/components/api.html
api:
  password: "RANDOM_PASSWORD_FOR_HOME_ASSISTANT_TO_CONNECT"

# Enable Over The Air update component
# https://esphome.io/components/ota.html
ota:
  password: "RANDOM_PASSWORD_FOR_ESPHOME_OTA_UPDATES"

binary_sensor:
  - platform: gpio
    pin:
      number: GPIO13
      mode: INPUT_PULLUP
      inverted: True
    name: "Deltaco SH-P01 Button"
    on_press:
      - switch.toggle: deltaco_relay_1
  - platform: status
    name: "Deltaco SH-P01 Status"

output:
  - platform: esp8266_pwm
    id: deltaco_smartplug_blue_led
    pin:
      number: GPIO5
      inverted: True
      
switch:
  - platform: gpio
    name: "Deltaco SH-P01 Relay"
    id: deltaco_relay_1
    pin: GPIO12

light:
  - platform: monochromatic
    name: "Deltaco SH-P01 blue LED"
    output: deltaco_smartplug_blue_led

This was taken from the discussion board referred above. All I needed to do was to edit the SSIDs and passwords and compile a new firmware:

docker run --rm -v "${PWD}":/config -it esphome/esphome relay_1.yaml compile

This printed a lot of debug information and ended with following lines:

Building .pioenvs/relay_1/firmware.bin
Retrieving maximum program size .pioenvs/relay_1/firmware.elf
Checking size .pioenvs/relay_1/firmware.elf
DATA: [===== ] 45.3% (used 37148 bytes from 81920 bytes)
PROGRAM: [==== ] 41.5% (used 425048 bytes from 1023984 bytes)
Creating BIN file ".pioenvs/relay_1/firmware.bin" using ".pioenvs/relay_1/firmware.elf"
========================= [SUCCESS] Took 29.83 seconds =========================
INFO Successfully compiled program.

And yes, the compiled firmware was at .esphome/build/relay_1/.pioenvs/relay_1/firmware.bin! All I needed to do is to get this firmware to the device.

Flashing the Firmware with tuya-convert

The tuya-convert offers a docker image to make the flashing, but I could not make it work. Therefore I installed the script and required packages directly to my Ubuntu as instructed in the README:

git clone https://github.com/ct-Open-Source/tuya-convert
cd tuya-convert
nano -w config.txt
# Changed value WLAN to my device name, wlx7cdd901255af
# Enumerate your device names with "ifconfig"
sudo ./install_prereq.sh

At this point I disconnected by WLAN from the local access point so it was available for tuya-convert. I also copied the ESPhome firmware.bin to tuya-convert/files/relay_1.bin. Then it was time to start the flashing script:

sudo ./start_flash.txt

When instructed I joined my phone to new WLAN access point “vtrust-flash” and after this was done I reset my SH-P01. It took me a while to understand why it did not respond when I pressed the button for the magic 6 seconds. Finally it turned out that the device already had connected to the AP.

The script did the trick. First it downloaded the firmware backup and after that it asked which binary file I wanted to install. After a while the relay_1.bin was uploaded.

Installing Home Assistant

Since I have a Xen server I installed the Home Assistant to a fresh VM running Debian Stretch. The Home Assistant configuration was quite uneventful as everything went as planned.

Since the server and the SH-P01 were on the same network segment (same LAN) the switch was discovered right away. All I needed to do was to give the API password I defined in relay_1.yaml and wrote to the ESPhome firmware.

Everything worked: the relay, the light and the button.

Flashing More Devices

To add more devices just make a copy of the ESPhome configuration (relay_1.yaml) and edit the esphome:name -setting:

esphome:
  name: relay_2
  platform: ESP8266
  board: esp01_1m

The device names must be unique and they’re used for example as a hostname of the device. Home Assistant creates its ID:s from device names (e.g. “Deltaco SH-P01 Relay” becomes “switch.deltaco_sh_p01_relay”). In case you’re worried about these entity ID:s you might want to give distinctive names to avoid overloading (“switch.deltaco_sh_p01_relay_2”, “switch.deltaco_sh_p01_relay_3” etc.). You might also want to change some of the passwords. After this just repeat the steps with the new firmware.

The sample configuration toggles the relay when the button is pressed. If you don’t want this behaviour but want to control the relays by the Home Assistant automations just remove this codeblock:

on_press:
  - switch.toggle: deltaco_relay_1

2 thoughts on “Reflashing Deltaco Smartplug SH-P01 to Work With Home Assistant

  1. It is still possible to use these cheap and durable switches with for instance tasmota or espurna. (my choice is espurna as it is more responsive)

    It is possible to connect directly to the esp82xx inside and flash.
    The module inside is a tuya version (TYWE2S) that contains an esp82xx.

    Some work is for sure required. An hour or so for a couple of switches.
    Tools I have been using; A robust (plastic) cutting board, a knife and a hammer (I’m using a cheap carving knife from IKEA).
    The knife fits into the narrow slot at the top. Work around and knock with the hammer and the top part will come loos.
    Alternatively you will need to cut through the plastic. But the top part will eventually come loos.
    There are two larger soldering points on the circuit board that connects to the plug below and also holds the circuit board in place.
    Removing the circuit board requires a heavier kind of soldering iron. A tip is to use a tying wire and bend a small hook at the end, and use this through the holes in the circuit board and pull at the same time as heat is applied.
    After this, connect a 3.3V RS-232 of your choice to rx/tx/gnd and 3.3V for supply voltage and flash.
    I’m using a raspberry pi as it can be used directly, also including a 3.3v supply voltage.
    After this, solder the circuit board back and glu on the top part again.

    1. Xxyxxy, thanks for your comment. I totally agree what you say about the durable case of SH-P01. This is exactly why I decided not to try opening the case. I ordered a Sonoff S26 which is fastened by three Philips screws. All required connectors (RX, TX, GND and VCC) are clearly marked on the circuit board.

      However, reflashing S26 did not work like a charm either. My USB-TTL converter did not provide enough 3,3V DC power and I had to use an external power supply.

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