Air Conditioner

2 articles

Tech 19 Sep 2026 7 min read

Reliable ESP32 IR Air-Conditioner Control Needs Hysteresis and State Synchronization

An ESP32 can turn a conventional infrared air conditioner into a temperature-driven controller without modifying the AC itself. The basic signal path is simple: a room-temperature sensor feeds the ESP32, the firmware decides whether cooling is required, and an IR LED transmits the same kind of frame the handheld remote would send. The difficult part is not producing infrared light. It is keeping the control loop stable while working with an appliance whose IR protocol may encode the remote’s complete state in every transmission.

ESP32 Infrared

Tech 19 Sep 2026 7 min read

Gesture-Controlled Air Conditioner with ESP32-S3 Without a Camera

A camera is unnecessary when an air-conditioner controller only needs a small vocabulary of hand motions. The useful signal is not an image of the hand; it is a directional event such as up, down, left, or right. A short-range optical gesture sensor can reduce that input to a few bytes before the ESP32-S3 sees it. That changes the embedded design substantially. There is no camera frame buffer, DVP bus, image preprocessing, or inference model competing with the LCD and infrared transmitter. The ESP32-S3 can spend its resources on the part that actually needs careful handling: keeping the intended AC state synchronized with each gesture and encoding that state into the appliance’s IR protocol.

ESP32-S3 Gesture Sensor