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ESP32-S3

3 articles
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
Tech 19 Sep 2026 6 min read

ESP32-S3 HMI Performance Is Mostly a Memory-Bandwidth Problem

An ESP32-S3 can run a touchscreen HMI without a Linux-class processor, but CPU clock alone does not determine whether the interface feels responsive. Once a display uses a large framebuffer, the critical path includes memory capacity, PSRAM bandwidth, DMA traffic, pixel format, pixel clock, and the amount of the screen redrawn for each interaction. The ESP32-S3 combines a dual-core Xtensa LX7 CPU running up to 240 MHz with an LCD/camera peripheral, DMA support, Wi-Fi, Bluetooth LE, and external PSRAM options. That makes it a useful HMI controller, especially when the interface consists of controls, status indicators, charts, configuration pages, and moderate animation.

ESP32-S3 HMI
Tech 19 Sep 2026 6 min read

Driving an ILI9341 SPI Display and Touch Controller from ESP32-S3

A 2.4-inch 240 × 320 TFT module built around the ILI9341 is a practical match for an ESP32-S3 because the display controller accepts a serial SPI interface. The module is not necessarily one device: a typical board can contain the ILI9341 for pixels, a separate resistive-touch controller, and sometimes a microSD socket. That distinction determines the wiring. The devices may share SPI clock and data lines, while each peripheral keeps its own chip-select signal.

ESP32-S3 ILI9341