yeelight-c900

UART

JP3 uart
GND
Rx
Tx
Vcc

gpio for light

test result is :

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

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

gpio for fan

gpio16( RX )  --->  con2 ( TX )
gpio17( TX )  --->  con2 ( RX )
EN( pin3 )    --->  con2( wifi_en )
gpio33        --->  fan_buzzer_beep

remote controller adv data

the data style is 50.30.8E.06 + frame number + mac address + 01.10.03 + key code + 00.00

# for fan
[21:53:04][D][ble_adv:107]:     - 0xFE95: (length 17)  - 50.30.8E.06.8B.0B.85.6E.38.C1.A4.01.10.03.00.00.00 (17)
# for light
[21:52:09][D][ble_adv:107]:     - 0xFE95: (length 17)  - 50.30.8E.06.89.0B.85.6E.38.C1.A4.01.10.03.01.00.00 (17)
# for recirculating air
[21:54:25][D][ble_adv:107]:     - 0xFE95: (length 17)  - 50.30.8E.06.8E.0B.85.6E.38.C1.A4.01.10.03.02.00.00 (17)
# for warn
[21:56:14][D][ble_adv:107]:     - 0xFE95: (length 17)  - 50.30.8E.06.94.0B.85.6E.38.C1.A4.01.10.03.03.00.00 (17)
# for night light
[21:54:49][D][ble_adv:107]:     - 0xFE95: (length 17)  - 50.30.8E.06.90.0B.85.6E.38.C1.A4.01.10.03.04.00.00 (17)
# for brightness
[21:55:25][D][ble_adv:107]:     - 0xFE95: (length 17)  - 50.30.8E.06.92.0B.85.6E.38.C1.A4.01.10.03.05.00.00 (17)

for remove repeat adv data, add global variable frame_counter, that store previous frame number x[4].

         - if:
            condition: 
              lambda: "return(x[14] == 1 && id(frame_counter) != x[4]);"
            then:
             - lambda: |-
                 id(frame_counter) = x[4];

sniff communication between esp32 and BP6601 using uart

# on
[D][uart_debug:114]: >>> 01:04:01:18:13:03 -> 0x04 + 0x01 + 0x13 = 0x18
[D][uart_debug:114]: <<< 01:F3:01:07:13:03 -> 0xF3 + 0x01 + 0x13 = 0x07

# off
[D][uart_debug:114]: >>> 01:01:01:13:11:03 -> 0x01 + 0x01 + 0x11 = 0x13
[D][uart_debug:114]: <<< 01:F3:01:05:11:03 -> 0xF3 + 0x01 + 0x11 = 0x05

# 1 level
[D][uart_debug:114]: >>> 01:03:01:05:01:03 -> 0x03 + 0x01 + 0x01 = 0x05
[D][uart_debug:114]: <<< 01:F3:01:F5:01:03 -> 0xF3 + 0x01 + 0x01 = 0xF5

# 2 level
[D][uart_debug:114]: >>> 01:03:01:36:32:03 -> 0x03 + 0x01 + 0x32 = 0x36
[D][uart_debug:114]: <<< 01:F3:01:26:32:03 -> 0xF3 + 0x01 + 0x32 = 0x26

# 3 level 
[D][uart_debug:114]: >>> 01:03:01:68:64:03 -> 0x03 + 0x01 + 0x64 = 0x68
[D][uart_debug:114]: <<< 01:F3:01:58:64:03 -> 0xF3 + 0x01 + 0x64 = 0x58


Byte  Value  Description
0     0x01   Start of frame (always 0x01)
1     0x03   0x01=Off, 0x03=On, 0x04=OnReverse
2     0x01   ??
3     0x68   Checksum (byte1 + byte2 + byte4)
4     0x64   Fan speed 0x01...0x64 = 1...100%
5     0x03   End of frame (always 0x03)

Credits, thanks for help

yeelight_fan_controller @syssi

References, sources & inspiration

https://github.com/syssi/esphome-yeelight-ceiling-light

arendst/Tasmota#13664 (comment)

license MIT