Add Johnson JN52N air conditioner (TYWE1S, TCL protocol)

src/docs/devices/Johnson-JN52N-TCL-AC/config.yaml

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+esphome:
+  name: ac-jn52n
+  friendly_name: "Johnson JN52N AC"
+
+esp8266:
+  board: esp01_1m
+
+external_components:
+  - source: github://gnacho/esphome-tcl-ac/components
+    components: [tcl_climate]
+
+uart:
+  id: uart_bus
+  tx_pin: GPIO15
+  rx_pin: GPIO13
+  baud_rate: 9600
+  parity: EVEN
+
+climate:
+  - platform: tcl_climate
+    id: tcl_custom_climate
+    uart_id: uart_bus
+    name: "Johnson JN52N"
+    icon: "mdi:fan"
+
+wifi:
+  ap:

src/docs/devices/Johnson-JN52N-TCL-AC/index.md

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+---
+title: "Johnson JN52N Air Conditioner (TYWE1S, TCL protocol)"
+date-published: 2026-07-28
+type: misc
+standard: global
+board: esp8266
+made-for-esphome: false
+difficulty: 3
+---
+
+## Product Description
+
+Split air conditioner sold as Johnson JN52N (TCL-based, also found under other brand names).
+Its WiFi module is a Tuya **TYWE1S** (ESP8266EX, 2 MB flash), but the unit does **not** use the
+Tuya MCU protocol: the module talks to the indoor unit over UART using the **proprietary TCL
+protocol** (frames starting with `0xBB`, 9600 baud, EVEN parity), so neither the `tuya:` nor the
+`midea:` ESPHome components work with it.
+
+Flashing the TYWE1S with ESPHome plus the community
+[TCL climate component](https://github.com/gnacho/esphome-tcl-ac) gives full local control:
+modes (cool/heat/dry/fan/auto), presets (eco/sleep/boost), fan speeds, motorized vertical and
+horizontal swing, beep on/off and ambient temperature.
+
+## Product Images
+
+![Johnson JN52N datasheet](datasheet.jpg "Johnson JN52N datasheet")
+![Back of the WiFi board](pcb-back.jpg "Back of the WiFi board: flashing pins are labeled")
+![TYWE1S module](module.jpg "Front of the board with the TYWE1S module")
+
+## Flashing
+
+The TYWE1S is flashed like any ESP8266 with `esptool`:
+
+1. With the AC **unplugged from mains**, connect a USB-to-UART adapter to the labeled flashing
+   pins on the back of the board: **3V3, GND, TX, RX**. Dupont cables held firmly in place work;
+   no soldering needed.
+2. Bridge **GPIO0 to GND** and power up the board to enter download mode.
+3. Back up the stock firmware first: `esptool.py --port /dev/ttyUSB0 read_flash 0x0 0x200000 backup.bin`
+   (the dump must be exactly 2097152 bytes).
+4. Flash ESPHome: `esptool.py --port /dev/ttyUSB0 write_flash 0x0 firmware.bin`.
+
+**Warning: this device works with mains voltage. Take all necessary precautions.**
+
+## GPIO Pinout
+
+| Pin    | Function                    |
+| ------ | --------------------------- |
+| GPIO15 | UART TX (to AC indoor unit) |
+| GPIO13 | UART RX (from AC unit)      |
+
+## Basic Configuration
+
+The config below exposes the climate entity (modes, presets, fan speeds and per-axis swing
+on/off). Extras like the beep switch, swing position selects and ambient temperature sensor
+are template entities wired to the component's methods — see the full example in the
+component repository linked below.
+
+```yaml file=config.yaml
+```
+
+## Links
+
+- [Full firmware, TCL climate component and precompiled binary](https://github.com/gnacho/esphome-tcl-ac)
+- [Original TCL AC component this fork is based on](https://github.com/Kannix2005/esphome-tcl-ac)