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Flashing a Mi Home 1S LED Desk Lamp with ESPHome

Changes

2024-09-06 V1.0 First version

Summary

I found that this Xiaomi Lamp had an esp32 in it and could pretty easily be flashed with ESPHome. I always like commercial products that can be reflashed with open source and non cloud based firmware, so thought it might be a useful addition to my work desk. This is a pretty low effort product to flash.

The lamp is just a bar of LEDs (warm white and cool white) on a stand, and you can tilt the bar up and down. To move the bar sideways, you need to spin the whole base. The bar can nicely bow down completely if you wan it out of the way (it comes with a little foam clip to clamp the arm to the stand for transport/packing)

I purchased the lamp from PB Tech in NZ for around NZ$70, but they have had it cheaper and on special. There are other Xiaomi lamps, including the smart pro with a higher lumen output, but I haven’t attempted looking inside one of those.

It came in a much bigger box than I was expecting…

Process

Opening up the lamp

It is pretty easy to open up, but you need to find the 3 Philips head screws which are under the rubber foot strip. Have a look at the images to see the layout and prise up the rubber in the areas needed. It should just stick back down by itself when finished.

The first screw is just to the right of the power entry and the other two are spaced evenly as thirds.

The hole directly in line with the power entry is for reset.

Locations for the 3 screws
Screw near the power entry
One of the 3 screws (this one near the QR code)

Connecting up to USB serial

Use your usual goto method for connection up a usb to serial adapter or sometimes called a FTDI adapter.

The pins you’ll need are all nicely exposed and labelled on the back of the board so you don’t need to remove anything at all once the back cover is off.

I soldered up wires to +ve, GND, TX, RX, and D0. I wasn’t sure whether I’d need D0 for putting the chip into flash mode, so I soldered a wire on anyway. Turns out I did.

I like to use this little module from superhouse which was designed for sonoff devices, but I find it handy as it brings the 4 needed pin to a single row header. I also made a female to female header socket from a couple of pin headers.

All Pins are nicely exposed
This female to female header is handy
The USB to serial adapter with the convenient sonoff adapter and female to female adapter all hooked up to a USB extension socket. Occasionally you can get away with no soldering, but in this case it is much easier to solder some leads on so you aren’t mucking around trying to hold things in place.

Flashing ESPHome

Build your ESPHome yaml file (mine is below … which is pretty heavily commented) and use a tool such as ESP Home Web to flash it to your esp32.

I tried one flash and it wouldn’t communicate, but holding the D0 wire to GND and restarting the esp32 with the power button on the serial adapter seemed to put it into flash mode and it worked on the second try.

Obviously just watch which way around your serial pins are connected, TX -> RX and RX -> TX.

Finishing up

  1. Test that the unit communicates to your Home Assistant and/or MQTT setup.
  2. Test the functions are working:
    • The light should switch on and off with a press and release of the knob, and turning the knob should ramp the output up and down.
    • Colour temp can be changed by pressing down the knob and turning it at the same time (not sure what the original factory firmware did)
    • Also the functions can obviously be changed from the head end.
  3. Unsolder the temporary pins/wires for flashing.
  4. Screw the base back on and press back the rubber foot strip.

ESPHome YAML

The original yaml I worked from I found here. Thanks to the person who did the initial work to figure out the I/O.

#############################################
#############################################
# Mi Smart LED Desk Lamp 1S
# ESP32, LED Strip with variable white colour temp, rotary encoder
# https://www.mi.com/global/product/mi-led-desk-lamp-1s/
#############################################
#############################################

#############################################
# SECRETS
# Secrets file is usually at config/secrets.yaml
# or config/esphome/secrets.yaml
# depending on your setup with HA
#############################################
# SECRETS FILE needs these specific secrets:
# esp-midesklamp1s_api_key
# esp-midesklamp1s_ota_pass
# esp-midesklamp1s_static_ip (Optional)
# esp-midesklamp1s_gateway (Optional)
# esp-midesklamp1s_subnet (Optional)
#
# SECRETS FILE needs these generic Secrets:
# wifi_ssid
# wifi_password
# fallback_ap_password
# mqtt_server
# mqtt_username
# mqtt_password
# web_server_username (Optional)
# web_server_password (Optional)
#############################################

#############################################
# VARIABLE SUBSTITUTIONS
# Give the device a useful name & description here
# and change values accordingly.
#############################################
substitutions:
  device_name: esp-midesklamp1s
  friendly_name: "Mi 1S Lamp Office"
  description_comment: "Office Desk Lamp with variable white colour temp and rotary encoder for brightness"

  # if NOT using a secrets file, just replace these with the passwords etc (in quotes)
  api_key: !secret esp-midesklamp1s_api_key # unfortunately you can't use substitutions in secrets names
  ota_pass: !secret esp-midesklamp1s_ota_pass # unfortunately you can't use substitutions in secrets names
  wifi_ssid: !secret wifi_ssid
  wifi_password: !secret wifi_password
  fallback_ap_password: !secret fallback_ap_password

  # Add these if we are giving it a static ip, or remove them in the Wifi section
  #static_ip_address: !secret esp-midesklamp1s_static_ip
  #static_ip_gateway: !secret esp-midesklamp1s_gateway
  #static_ip_subnet: !secret esp-midesklamp1s_subnet

  mqtt_server: !secret mqtt_server
  mqtt_username: !secret mqtt_username
  mqtt_password: !secret mqtt_password
  mqtt_topic: "esphome" # main topic for the mqtt server, call it what you like

  web_server_username: !secret web_server_username
  web_server_password: !secret web_server_password

  update_time: 60s # update time for for general temp sensors etc

#############################################
# ESPHome
# https://esphome.io/components/esphome.html
#############################################
esphome:
  name: ${device_name}
  friendly_name: ${friendly_name} # appears as main name on the esphome page in HA
  comment: ${description_comment} # appears as comment on the esphome page in HA
  #min_version: 2024.6.0

#############################################
# ESP Platform and Framework
# https://esphome.io/components/esp32.html
#############################################
esp32:
  board: esp32doit-devkit-v1
  framework:
    type: esp-idf # Suggest using the ESP-IDF Framework. Changing from 'arduino' to 'esp-idf' needs a cabled flash to correct partitions
    version: recommended # recommended, latest or dev

    # these just for the esp32doit-devkit-v1 and Mi S Lamp 
    sdkconfig_options:
      CONFIG_FREERTOS_UNICORE: y
    advanced:
      ignore_efuse_mac_crc: true

#############################################    
# ESPHome Logging Enable
# https://esphome.io/components/logger.html
############################################# 
logger:
  level: INFO  # INFO Level suggested, or DEBUG for testing
  #baud_rate: 0 #set to 0 for no logging via UART, needed if you are using it for other serial things (eg PZEM)
  #esp8266_store_log_strings_in_flash: false
  #tx_buffer_size: 64

#############################################    
# Enable the Home Assistant API
# https://esphome.io/components/api.html
#############################################  
api:
  encryption:
    key: ${api_key}
  
#############################################    
# Enable Over the Air Update Capability
# https://esphome.io/components/ota.html?highlight=ota
#############################################  
ota:
  - platform: esphome
    password: ${ota_pass}

#############################################    
# Safe Mode
# Safe mode will detect boot loops
# https://esphome.io/components/safe_mode
#############################################  
safe_mode:

#############################################    
# Wifi Settings 
# https://esphome.io/components/wifi.html
#
# Power Save mode (can reduce wifi reliability)
# NONE (least power saving, Default for ESP8266)
# LIGHT (Default for ESP32)
# HIGH (most power saving)
#############################################  
wifi:
  ssid: ${wifi_ssid}
  password: ${wifi_password}
  #power_save_mode: LIGHT #https://esphome.io/components/wifi.html#wifi-power-save-mode
  #manual_ip: #optional static IP address
    #static_ip: ${static_ip_address}
    #gateway: ${static_ip_gateway}
    #subnet: ${static_ip_subnet}
  ap:   # Details for fallback hotspot in case wifi connection fails https://esphome.io/components/wifi.html#access-point-mode
    ssid: ${device_name} fallback AP
    password: ${fallback_ap_password}
    ap_timeout: 30min # Time until it brings up fallback AP. default is 1min

#############################################    
# Web Portal for display and monitoring
# Turning this off is probably a good idea to save resources.
# https://esphome.io/components/web_server.html
#############################################   
#web_server:
#  port: 80
#  auth:
#   username: ${web_server_username} #probably a good idea to secure it
#   password: ${web_server_password}

#############################################
# MQTT Monitoring
# https://esphome.io/components/mqtt.html?highlight=mqtt
# MUST also have api enabled if you enable MQTT
#############################################
mqtt:
  broker: ${mqtt_server}
  topic_prefix: ${mqtt_topic}/${device_name}
  username: ${mqtt_username}
  password: ${mqtt_password}
  discovery: True # enable entity discovery (true is default)
  discover_ip: True # enable device discovery (true is default)


#############################################
# Time Component
# https://esphome.io/components/time/index.html#time-component
# Sync with HA Time.  Probably not really necessary.
#############################################
time:
  - platform: homeassistant
    id: homeassistant_time

#############################################
# Text Sensors
# https://esphome.io/components/text_sensor/index.html
#############################################
text_sensor:
  - platform: version
    name: ${friendly_name} Version
  - platform: wifi_info
    ip_address:
      name: ${friendly_name} IP Address

#############################################
# General Sensors 
# https://esphome.io/components/sensor/index.html
#############################################
sensor:
  - platform: uptime      # Uptime for this device
    name: ${friendly_name} Uptime
    update_interval: ${update_time}  
  - platform: wifi_signal # Wifi Strength
    name: ${friendly_name} Wifi Signal
    update_interval: ${update_time}  

  # Mi Desk Lamp 1S Configuration
  - platform: rotary_encoder
    id: rotation
    pin_a: GPIO27
    pin_b: GPIO26
    resolution: 2
    on_value:
      then:
        - if:
            condition:
              # Check if Button is pressed while rotating
              lambda: "return id(button).state;"
            then:
              # If Button is pressed, change CW/WW
              - lambda: |-
                  auto min_temp = id(light1).get_traits().get_min_mireds();
                  auto max_temp = id(light1).get_traits().get_max_mireds();
                  auto cur_temp = id(light1).current_values.get_color_temperature();
                  auto new_temp = max(min_temp, min(max_temp, cur_temp + (x*10)));
                  auto call = id(light1).turn_on();
                  call.set_color_temperature(new_temp);
                  call.perform();
            else:
              # If Button is not pressed, change brightness
              - light.dim_relative:
                  id: light1
                  relative_brightness: !lambda |-
                    return x / 25.0;
        # Reset Rotation to 0
        - sensor.rotary_encoder.set_value:
            id: rotation
            value: 0

#############################################
# Binary Sensors
# https://esphome.io/components/binary_sensor/index.html
#############################################
binary_sensor:
  - platform: gpio
    id: button
    pin:
      number: GPIO33
      inverted: True
      mode: INPUT_PULLDOWN
    on_click:
      then:
        - light.toggle:
            id: light1
            transition_length: 0.2s

#############################################
# Base Output Component
# https://esphome.io/components/output/index.html#base-output-configuration
#############################################
output:
  - platform: ledc    # Cool White LED PWM
    pin: GPIO2
    id: output_cw
    frequency: 40000Hz
    power_supply: power
  - platform: ledc
    pin: GPIO4        # Warm White LED PWM
    id: output_ww
    power_supply: power
    frequency: 40000Hz

#############################################
# Power Supply Component
# https://esphome.io/components/power_supply.html#power-supply-component
#############################################
power_supply:
  - id: power
    pin: GPIO12
    enable_time: 0s
    keep_on_time: 0s

#############################################
# Light Component
# https://esphome.io/components/light/index.html#light-component
#############################################
light:
  - platform: cwww # https://esphome.io/components/light/cwww.html#cold-white-warm-white-light
    id: light1
    default_transition_length: 0s
    constant_brightness: true
    name: "${friendly_name} Light"
    cold_white: output_cw
    warm_white: output_ww
    cold_white_color_temperature: 4800 K
    warm_white_color_temperature: 2500 K # 2500k is the original value of the lamp. To correct binning for 2700k to look more like 2700k use 2650k instead
    restore_mode: ALWAYS_ON
    gamma_correct: 0

Lamp Specs on the box

Product specifications on the box

Improvements

Some improvements I’ll potentially make to the yaml:

  • Ramp up and down of the LED when switching it on/off etc is always nicer than an abrupt change, so I’ll likely lengthen this.

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