Add yeelink.light.fancl5 support

[0neday]

RT,

thank you

[syssi]

You could open the device and provide some photos. If you own a multimeter I could provide some instructions how to collect all required infos.

[0neday]

You could open the device and provide some photos. If you own a multimeter I could provide some instructions how to collect all required infos.

thank you, I have multimeter, I will give you some postion of gpio, such as gpio0, rx, tx ...

[syssi]

Some high-res photos of the mainboard especially the WiFi daughter board are important. In best case the pin header between the mainboard and the daughter board is labeled.

Are you able to control different speed levels of the ceiling fan using the app?

[0neday]

Are you able to control different speed levels of the ceiling fan using the app?

using Mijia app, I can control fan speed.

[syssi]

How many levels?

[0neday]

3 level speed, it use uart communicate between esp32 and bp8601

[syssi]

You could use a logic analyzer (something like this https://de.aliexpress.com/item/1005002511491492.html or https://de.aliexpress.com/item/1005003812410259.html) plus a open-source software called sigrok/pulseview to capture the serial traffic between the ESP and the driver board of the fan. As soon as we know the messages here we can try to replicate the communication. The ceiling lamp is working already? What's working and what's not if you flash your yaml? Did you make a backup of the stock firmware?

[0neday]

no, I have not flash esphome, I just test UART using a usb-ttl tools, and get

brownout detector 

when I set gpio0 = low level, it could enter into flash mode.

I can not get gpio for light., the gpio of my yaml is copy from your's, do not test.

Do you any decompiled circuit diagram of yeelight ceiling?

[syssi]

The brownout detector is triggered if the power supply is not strong enough. I assume you did power the ESP using the USB-TTL converter. Cheap converters (f.e. PL2303) doesn't provide enough current to power an ESP. You should/could use an external power supply.

If you are able to enter the flash mode please make a backup of the firmware. Please follow this guide:

https://github.com/mmakaay/esphome-xiaomi_bslamp2/blob/dev/doc/flashing.md#make-a-backup-of-the-current-firmware

I don't have any circuit diagrams. How to identify the PWM GPIOs:

1. Power the ESP32 properly. You must be able to control the device using your Android app. It's fine if you power the ESP only.
2. Connect the USB-to-TTL module to RX, TX and GND. You should see debug messages of the stock firmware
3. Turn the light on and change the color temperature to 100% warm-white
4. Measure the voltage between GND and every GPIO. You should find a GPIO providing 3.3V (PWM=100%).
5. Set the warm white brightness to 50%. Measure again. You should find a GPIO providing 1.5-2V now (PWM=50%).
6. Set the warm white brightness to the lowest value (1%?). Measure again.

Follow the same steps to identify the cold-white PWM GPIO and the Night Light PWM GPIO. It's possibe there is a feature called "power supply standby" (STB). This is a GPIO which drives/turns on the power supply if you turn on the light (Voltage between GND and STB should be 3.3V). If you turn off the light the voltage should drop to 0V.

Please try to identify these GPIOs so you are able to control the ceiling light. The next step will be the reverse engineering of the fan. I'm afraid a logic analyzer is required here. I could provide some guidance how to use sigrok to decode the serial traffic between the ESP and the driver board of the fan.

[syssi]

Another wish/suggestion:

1. Please use a continuity tester or a ohm meter to measure the continuity between the test points (TP1, TP5) and the GPIOs of the ESP. I bet GPIO0 is exposed as test point.
2. Use a continuity tester or a ohm meter to measure the continuity between CON2 (connector 2) of the fan driver board (EN, WIFI, TXD, RXD, (GND)) and the GPIOs of the ESP.
3. Could you provide the label / model identifier of IC2? I assume it's an EEPROM and connected via I2C (2 GPIOs, VCC, GND). If we know the type we can lookup the pinout and identify the SDA and SCL pins connected to the ESP.
4. There is a piezo buzzer labeled with BP1. I assume the buzzer is somehow connected to the ESP. Usually a piezo isn't connected directly to the ESP. I assume there is an NPN transistor in between. Do you know how to let the device beep?
5. Please provide the type / model identifier of the 24 pin IC located at the fan driver board. I've trouble to identify the label.

[0neday]

Measure the voltage between GND and every GPIO. You should find a GPIO providing 3.3V (PWM=100%).

you are genius！

Do you know how to let the device beep

when use remote controller and tap any key, the buzzer beep a time.

label / model identifier of IC2
provide the type / model identifier of the 24 pin IC located at the fan driver board

I will provide the label of IC, wait some time

[0neday]

test result is :

cold --> gpio21
warn --> gpio19
night mode ---> gpio23

so, the light gpio is same as yeelink.light.ceiling15

ps:
I have question is except for fan, there is a remote controller, that is connected by bluetooth.

[syssi]

Could you provide a photo of your remote control? I assume it's the standard BLE remote talking to the ESP. It's known how to receive commands from these kind of remotes but we shouldn't try to support the remote control at the first iteration. I would be happy if we focus on the ceiling light and fan feature.

[syssi]

Did you backup the stock firmware?