LILYGO's T-Encoder Pro Is a Smart Espressif ESP32-S3 Rotary Encoder and Touchscreen Display

With a bright AMOLED touchscreen, rotary encoder, buzzer, and Qwiic expansion, the T-Encoder Pro packs a lot into a small footprint.

Gareth Halfacree
23 days agoHW101 / Displays

Embedded and hobbyist electronics specialist LILYGO is preparing to launch a smart rotary encoder, designed to add both inputs and a display to your project — and featuring a pair of Qwiic connectors for solder-free prototyping: the T-Encoder Pro.

"T-Encoder-Pro is a smart control knob equipped with an AMOLED screen," LILYGO explains of its latest development device, "based on the [Espressif] ESP32-S3 R8 chip, which is controlled by a dial." That particular chip means a dual-core Tensilica Xtensa LX7 microcontroller running at up to 240MHz, 512kB of internal static RAM, 8MB of external pseudo-static RAM (PSRAM), and 16MB of flash — alongside Wi-Fi and Bluetooth 5 Low Energy (BLE) connectivity.

It's not the microcontroller that makes the T-Encoder Pro so interesting, though. Rather, it's what it's installed into: a round housing, with large hexagonal nut for panel-mounting, above which a circular knob protrudes. The top of this knob then reveals the display, a bright 390×390 color AMOLED panel — equally circular, of course. It's not just for show, either: the display is also a touchscreen, while the encoder delivers data on left and right rotation plus push.

To round the device's feature set off, Lilygo has also included an on-board buzzer for auditory feedback — while a pair of four-pin Qwiic sockets allow the device to be expanded with additional hardware solder-free. There's a USB Type-C port for data and power, with a trio of threaded brass inserts for mounting finishing off the design.

LILYGO has listed the T-Encoder Pro on its official store at $32.29, though at the time of writing it was listed as out of stock; an accompanying GitHub repository of code samples, published under the reciprocal GNU General Public License 3, lists it as "not yet sold."

Gareth Halfacree
Freelance journalist, technical author, hacker, tinkerer, erstwhile sysadmin. For hire: freelance@halfacree.co.uk.
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