Sharp AC Climate

The sharp_ac component allows communication with compatible Sharp/Bosch/Buderus/IVT indoor units over UART.

The component communicates with the indoor unit over UART and provides control and state reporting.

Hardware Connection

The indoor unit UART header exposes power and serial communication lines.

CN13 pinout

CN13 connector wiring

Pin mapping (HVAC to ESP)

Wire color	HVAC signal	ESP signal
Black	GND	GND
White	RX	TX
Green	TX	RX
Red	5V	VCC

WARNING

Verify connector pinout and voltage levels before connecting.

This component requires a UART bus configured with:

• 8 data bits
• EVEN parity
• 1 stop bit
• Baud rate 9600

NOTE

Many indoor units use 5V UART levels. If your ESP board is 3.3V-only, use a proper level shifter.

Example configuration

logger:
  baud_rate: 0

uart:
  id: ac_uart
  tx_pin: GPIO1
  rx_pin: GPIO3
  data_bits: 8
  baud_rate: 9600
  parity: EVEN
  stop_bits: 1

climate:
  - platform: sharp_ac
    id: hvac
    name: "Living Room AC"
    uart_id: ac_uart
    vane:
      horizontal:
        name: "Horizontal Vane"
      vertical:
        name: "Vertical Vane"
    ion_switch:
      name: "Plasmacluster"
    connection_status:
      name: "Connection Status"
    reconnect_button:
      name: "Reconnect"

WARNING

If you are using the Logger Component, make sure you are not using the same pins, or disable UART logging with:

logger:
  baud_rate: 0

Supported features

• Target temperature range: 16 °C to 30 °C
• HVAC modes: OFF, COOL, HEAT, DRY, FAN_ONLY
• Fan modes: AUTO, LOW, MEDIUM, HIGH
• Presets: NONE, ECO, BOOST
• Swing modes: OFF, HORIZONTAL, VERTICAL, BOTH
• Current temperature reporting

Configuration variables

• uart_id (Optional, ID): The UART bus to use.

• vane (Optional): Additional vane position controls.

  • horizontal (Optional): Horizontal vane select entity.

    • All options from Select.

  • vertical (Optional): Vertical vane select entity.

    • All options from Select.

• ion_switch (Optional): Optional ion/plasmacluster switch entity.

  • All options from Switch.

• connection_status (Optional): Optional connection state text sensor.

  • All options from Text Sensor.

• reconnect_button (Optional): Optional button that restarts the UART session.

  • All options from Button.

• All other options from Climate.

Notes

• The integration initializes a connection sequence on boot and continuously polls status updates.
• connection_status reports setup progress (Connecting (x/8)) and Connected once initialization completes.
• reconnect_button can be used to manually re-trigger the protocol initialization if communication stalls.

See Also

• Climate Component