M5Stack Dial
ESP32-S3 smart rotary knob with 1.28" round GC9A01 touch display (240x240), rotary encoder, RFID reader (WS1850S), RTC (BM8563), buzzer, and 2 Grove ports for IoT control interfaces.
$22.70
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Specifications
Components
Espressif ESP32-S3 dual-core Xtensa LX7 at 240MHz with 8MB flash, 8MB PSRAM, WiFi 802.11 b/g/n and BLE 5.0.
GC9A01 TFT controller driving the 1.28-inch 240×240 round IPS display with SPI interface.
WS1850S 13.56MHz contactless reader/writer module for NFC and RFID card applications, compatible with MFRC522.
BM8563 RTC with I2C interface, alarm, and timer functions for timekeeping and sleep scheduling.
Built-in incremental rotary encoder for precise rotational input and dial control.
Bus Interfaces
Overview
The M5Stack Dial (M5Dial) is a compact smart rotary knob device built around the ESP32-S3 microcontroller. It combines a 1.28-inch round GC9A01 TFT touchscreen (240×240 resolution) with a physical rotary encoder, creating an intuitive control interface for smart home panels, IoT controllers, and embedded UI applications.
The device integrates an RFID reader (WS1850S, 13.56MHz) for NFC/access control applications, a BM8563 real-time clock for scheduling and timekeeping, and a built-in buzzer for audio feedback. Two Grove ports (Port A for I2C and Port B for GPIO/ADC) enable easy expansion with M5Stack's ecosystem of sensors and modules.
With WiFi 802.11 b/g/n and Bluetooth LE 5.0 connectivity, the Dial can serve as a standalone smart home controller, thermostat interface, volume knob, or general-purpose IoT input device. Its compact 51×51×32.3mm form factor and 46.3g weight make it suitable for wall-mounting or desktop use.
Programmable via Arduino, ESP-IDF, and UIFlow (visual/MicroPython), with open-source firmware and schematics available on GitHub.
Use Cases
4Smart Home Dashboard
Wall-mounted or tabletop display showing Home Assistant dashboards, sensor readings, and smart home controls.
IoT
Internet of Things applications including connected sensors, actuators, and smart devices that communicate over WiFi, BLE, LoRa, or other wireless protocols.
Remote Control
IR or RF-based remote control devices for appliances, TVs, air conditioners, and home electronics.
Environmental Monitoring
Monitoring environmental conditions like temperature, humidity, air quality, and weather data using remote sensors.
Where to Buy
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