Trill Flex

by Bela

Trill Flex allows you to bring flexible sensing to your interactive projects.

There are two parts to Trill Flex: the base (where you'll find the Trill chip and a high-density connector) and the flexible sensor (made from flex PCB). Trill Flex's flexible sensor easily conforms to curves, bends, corners and more, giving you the freedom to create projects with touch surfaces that are virtually any shape.

The flexible sensor is detachable, meaning that you can swap it out for a flexible sensor that you created. You can find the editable plans for the Trill Flex sensor on the Github - just download and edit them. See the guide on designing your own flexible sensors for tips and tricks.

Trill Flex comes with a flexible single-axis bar sensor that detects multiple touches. Trill Flex uses a Grove connector to connect to your Bela system, breadboard or microcontroller. A Grove-to-pin cable is included, so snap the base to the sensor, plug it in, and start prototyping your new flexible project!


  • 36.3 mm x 22.4 mm (base)
  • 145.5 mm x 21.6 mm (detachable sensor)
  • 176 mm x 22 mm (when combined)


Capacitive touch sensing inspired by musicians, designed for makers

Trill is a family of touch sensors designed by Bela. Launched in 2019 on Kickstarter, Trill sensors are designed to place the power of high-resolution touch sensing in the hands of artists, designers, musicians, and creative makers of all kinds.


Trill was inspired by the way we use our hands to interact with the world. Harnessing the power of capacitive touch sensing for interaction, Trill sensors come in a range of shapes, sizes and types to create a convenient way of integrating beautiful touch sensing into any interactive project.


Trill sensors can be used individually, or chained together to make even larger surfaces. You can use up to 8 of a single Trill type, or a network of different Trill sensors for a totally custom, perfectly crafted interface.

Trill sensors are also highly customisable. Not only can they be trimmed to size to fit exactly where they need to, but they can also be covered and fully embedded in a project, and calibrated in software for exactly the right responsiveness and sensitivity you need.


Though Trill touch sensors are designed to take advantage of Bela’s low-latency processing, they are compatible with any system that suppports I2C communication such as Arduino, Teensy and Raspberry Pi. Download the Trill library and example projects for Bela and other platforms on the Trill Github repo.