esphome-yeelight-ceiling-light

Esphome custom firmware for some Yeelight Ceiling Lights.

Supported devices

Name	Model	Model no.	Specs
Yeelight Ceiling Light YLXD76YL	yeelink.light.ceil26	YLXD76YL	AC220V, 23W, 1500lm, 2700K-6500K, 32cm
Yeelight XianYu C2001C550	yeelink.light.ceil26	C2001C550	AC220V, 50W, 2700K-6500K, 55.5cm
Yeelight XianYu C2001C450 (untested!)	yeelink.light.ceil26(?)	C2001C450	AC220V, 50W, 2700K-6500K, 45.5cm
Yeelight XianYu C2001S500 (untested!)	yeelink.light.ceil26(?)	C2001S500	AC220V, 50W, 2700K-6500K, 50.5x50.5cm
Yeelight Meteorite Ceiling Light	yeelink.light.ceiling10	YLDL01YL	AC220V, 33W, 2700K-6500K, 7W RGB ambient light, 90x7x4 cm
Yeelight Ceiling Light YLXD42YL	yeelink.light.ceiling15	YLXD42YL	AC220V, 32W, 2200lm, 2700K-6500K, 48cm
Yeelight Ceiling Light YLXD41YL	yeelink.light.ceilingUNKNOWN	YLXD41YL	AC220V, 28W, 1800lm, 2700K-6500K, 32cm
Yeelight Staria Bedside LED	yeelink.light.lamp9	YLCT02YL	AC220V, 20W, 350lm, 2700K-6500K, without charger
Yeelight Staria Pro Bedside LED	yeelink.light.lampUNKNOWN	YLCT03YL	AC220V, 20W, 350lm, 2700K-6500K, Qi charger
Mi Smart LED Ceiling Light	yeelink.light.ceiling22	MJXDD01	AC220V, 45W, 3100lm, 2700K-6000K, 45cm

More esphome + yeelight projects

Features

yeelink.light.ceil26, yeelink.light.ceiling22

Light (CCWW)
- Brightness
- Color temperature (2700K-6500K)
Nightlight (2700K)
- Brightness
Sensor
- Power supply voltage (ESP32 VCC)

yeelink.light.ceiling10

Light (CCWW)
- Brightness
- Color temperature (2700K-6500K)
Nightlight (2700K)
- Brightness
Ambient light (RGB)
- Brightness
- Color
Sensor
- ADC1
- ADC2

yeelink.light.ceiling15, yeelink.light.ceilingUNKNOWN

Light (CCWW)
- Brightness
- Color temperature (2700K-6500K)
Nightlight (2700K)
- Brightness
Sensor
- ADC1
- ADC2

yeelink.light.lamp9, yeelink.light.lampX

Power button
Light (CCWW)
- Brightness
- Color temperature (2700K-6500K)
Nightlight (2700K)
- Brightness

Known bugs

Bootloop when BLE Tracker configured. Luckily ESPHome goes into safe mode after 10 unsuccessful boot attempts by default. So the device can be flashed OTA nevertheless.

Bootlog

[11:59:23]ets Jun  8 2016 00:22:57
[11:59:23]
[11:59:23]rst:0xc (SW_CPU_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
[11:59:23]configsip: 0, SPIWP:0xee
[11:59:23]clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
[11:59:23]mode:DIO, clock div:2
[11:59:23]load:0x3fff0018,len:4
[11:59:23]load:0x3fff001c,len:1044
[11:59:23]load:0x40078000,len:8896
[11:59:23]load:0x40080400,len:5828
[11:59:23]entry 0x400806ac
[11:59:23][I][logger:166]: Log initialized
[11:59:23][C][ota:366]: There have been 8 suspected unsuccessful boot attempts.
[11:59:23][I][app:029]: Running through setup()...
[11:59:23][C][power_supply:010]: Setting up Power Supply...
[11:59:23][C][light:097]: Setting up light 'unused_yeelight night light'...
[11:59:23][D][light:265]: 'unused_yeelight night light' Setting:
[11:59:23][D][light:278]:   Brightness: 100%
[11:59:23][C][light:097]: Setting up light 'unused_yeelight ceiling light'...
[11:59:23][D][light:265]: 'unused_yeelight ceiling light' Setting:
[11:59:23][D][light:278]:   Brightness: 100%
[11:59:23][D][light:282]:   Color Temperature: 1.0 mireds
[11:59:23][D][light:287]:   Red=100%, Green=100%, Blue=100%
[11:59:24][D][esp32_ble_tracker:148]: Starting scan...
[11:59:24][D][binary_sensor:034]: 'unused_yeelight Status': Sending initial state OFF
[11:59:24][C][adc:018]: Setting up ADC 'unused_yeelight power supply'...
[11:59:24][D][text_sensor:015]: 'unused_yeelight Esphome Version': Sending state '1.15.3 Feb 25 2021, 11:57:31'
[11:59:24][C][wifi:033]: Setting up WiFi...
[11:59:24][I][wifi:194]: WiFi Connecting to 'xxxxxxxx'...
[11:59:24][D][sensor:092]: 'unused_yeelight Uptime': Sending state 0.00001 days with 0 decimals of accuracy
[11:59:24][D][adc:056]: 'unused_yeelight power supply': Got voltage=3.90V
[11:59:24][D][sensor:092]: 'unused_yeelight power supply': Sending state 3.90000 V with 2 decimals of accuracy
[11:59:24][D][esp32_ble_tracker:544]: Found device 50:XX:XX:XX:XX:XX RSSI=-62
[11:59:24][D][esp32_ble_tracker:565]:   Address Type: PUBLIC
[11:59:24][D][esp32_ble_tracker:544]: Found device 49:XX:XX:XX:XX:XX RSSI=-91
[11:59:24][D][esp32_ble_tracker:565]:   Address Type: RANDOM
[11:59:29]E (6637) task_wdt: Task watchdog got triggered. The following tasks did not reset the watchdog in time:
[11:59:29]E (6637) task_wdt:  - IDLE0 (CPU 0)
[11:59:29]E (6637) task_wdt: Tasks currently running:
[11:59:29]E (6637) task_wdt: CPU 0: loopTask
[11:59:29]E (6637) task_wdt: Aborting.
[11:59:29]abort() was called at PC 0x400ea723 on core 0
[11:59:29]
[11:59:29]Backtrace: 0x40091698:0x3ffbe520 0x400918a9:0x3ffbe540 0x400ea723:0x3ffbe560 0x4008494e:0x3ffbe580 0x4000bfed:0x3ffcdb20 0x4008f135:0x3ffcdb30 0x4008e28f:0x3ffcdb50 0x400d8df1:0x3ffcdb90 0x401df9c9:0x3ffcdc30 0x401dfa95:0x3ffcdc50 0x400e0959:0x3ffcdc70 0x400e3632:0x3ffcdcc0 0x400e8973:0x3ffcdf50 0x4008e535:0x3ffcdf70
WARNING Found stack trace! Trying to decode it
WARNING Decoded 0x40091698: invoke_abort at /home/paul/src/esp32-arduino-lib-builder/esp-idf/components/esp32/panic.c:707
WARNING Decoded 0x400918a9: abort at /home/paul/src/esp32-arduino-lib-builder/esp-idf/components/esp32/panic.c:707
WARNING Decoded 0x400ea723: task_wdt_isr at /home/paul/src/esp32-arduino-lib-builder/esp-idf/components/esp32/task_wdt.c:252
WARNING Decoded 0x4008494e: _xt_lowint1 at /home/paul/src/esp32-arduino-lib-builder/esp-idf/components/freertos/xtensa_vectors.S:1154
WARNING Decoded 0x4008f135: vTaskExitCritical at /home/paul/src/esp32-arduino-lib-builder/esp-idf/components/freertos/tasks.c:3507
WARNING Decoded 0x4008e28f: xQueueGenericReceive at /home/paul/src/esp32-arduino-lib-builder/esp-idf/components/freertos/queue.c:2520
WARNING Decoded 0x400d8df1: esphome::esp32_ble_tracker::ESP32BLETracker::loop() at /home/sebastian/esphome/unused_yeelight/src/esphome/components/esp32_ble_tracker/esp32_ble_tracker.cpp:241
WARNING Decoded 0x401df9c9: esphome::Component::call_loop() at /home/sebastian/esphome/unused_yeelight/src/esphome/core/component.cpp:111
WARNING Decoded 0x401dfa95: esphome::Component::call() at /home/sebastian/esphome/unused_yeelight/src/esphome/core/component.cpp:111
WARNING Decoded 0x400e0959: esphome::Application::setup() at /home/sebastian/esphome/unused_yeelight/src/esphome/core/application.cpp:50 (discriminator 2)
WARNING Decoded 0x400e3632: setup() at /home/sebastian/esphome/unused_yeelight/src/main.cpp:360
WARNING Decoded 0x400e8973: loopTask(void*) at /home/sebastian/.platformio/packages/framework-arduinoespressif32@src-ff59aeb8b43c3669326fe991d70309ba/cores/esp32/main.cpp:14
WARNING Decoded 0x4008e535: vPortTaskWrapper at /home/paul/src/esp32-arduino-lib-builder/esp-idf/components/freertos/port.c:403
[11:59:29]
[11:59:29]Rebooting...

GPIOs

yeelink.light.ceil26

Name	Label	ESP32 GPIO	Stock firmware limits
Warm white PWM	W	GPIO19	0.4V - 1.5V
Cold white PWM	C	GPIO21	0.5V - 3.0V
Night light PWM	NL	GPIO23
Power supply GPIO	STB	GPIO23
VCC measurement	ADC1	GPIO35
TXD		GPIO1
RXD		GPIO3
GPIO0	TP3	GPIO0

The ESP32 will enter the serial bootloader when GPIO0 (test point TP3) is held low (GND) on reset / power.

yeelink.light.ceiling10

Name	Label	ESP32 GPIO	Stock firmware limits
Warm white PWM	W	GPIO19	0.42V - 2.55V
Cold white PWM	C	GPIO21	0.41V - 2.51V
Night light PWM	NL	GPIO23	N/A
Red PWM	R	GPIO33
Green PWM	G	GPIO26
Blue PWM	B	GPIO27
Power supply GPIO	ON/OFF	GPIO22	3.08V / 0V
TXD	TX	GPIO1
RXD	RX	GPIO3
GPIO0	IO0	GPIO0

The ESP32 will enter the serial bootloader when GPIO0 (test point IO0 at the back) is held low (GND) on reset / power.

yeelink.light.ceiling15

Name	Label	ESP32 GPIO	Stock firmware limits
Warm white PWM	W	GPIO19	0.67V - 3.08V
Cold white PWM	C	GPIO21	0.67V - 3.08V
Night light PWM	NL	GPIO23	0.06V - 3.0V
VCC measurement	ADC1	GPIO36	2.0V
VCC measurement	ADC2	GPIO32	1.76V
TXD		GPIO1
RXD		GPIO3
GPIO0	TP1	GPIO0

The ESP32 will enter the serial bootloader when GPIO0 (test point TP1 at the back) is held low (GND) on reset / power.

  ADC1 NL  WW GND           O  -- GND
   |   |   |   |            O  -- TXD
   8   6   4   2            O  -- RXD
   |   |   |   |           [O] -- 3V3
   o   o   o   o

   o   o   o   o
   |   |   |   |
   7   5   3   1
   |   |   |   |
  3V3 ADC2 CW GND

yeelink.light.ceiling22

Name	Label	ESP32 GPIO	Stock firmware limits
Warm white PWM	W	GPIO19	14% - 50% duty cycle
Cold white PWM	C	GPIO21	20% - 88% duty cycle
Night light PWM	NL	GPIO23	10% - 100% duty cycle
VCC measurement	ADC1	GPIO36
3.3V	TP1
GND	TP2
GPIO0	TP3	GPIO0
TXD	TP4	GPIO1
RXD	TP5	GPIO3

The ESP32 will enter the serial bootloader when GPIO0 (test point TP3 at the back) is held low (GND) on reset / power.

yeelink.light.lamp9, yeelink.light.lampUNKNOWN

Name	Label	ESP32 GPIO	Stock firmware limits
Warm white PWM		GPIO2	0.226V - 3.28V
Cold white PWM		GPIO27	0.194V - 3.28V
Night light PWM		GPIO12	0.197V - 3.27V
Power supply GPIO		GPIO4
Button		GPIO14
TXD	TX, TP9	GPIO1
RXD	RX, TP10	GPIO3
GPIO0	TP next to C37	GPIO0
SCL (I2C)		GPIO18
SDA (I2C)		GPIO17
LED (YLCT03YL only)		GPIO33
3.3V	+, TP7	3.3V
GND	-, TP8	GND

Disassembly

YLXD76YL

YLXD41YL

C2001C550

Remove the single safety screw on the back and rotate the cover counterclockwise.

YLDL01YL

The grey plastic frame can easily be removed with a credit card between the outer white body and the grey frame. It is just clipped into place. Kudos to @fhloston.

References, sources & inspiration: