The Price Controller is a retail experience designed for the Sea & Soil cooperative to emphasize and enhance their sliding scale pricing policy. The controller allows customers to choose the price of their sandwich via a simple interaction.
EMMA provides the software development, deployment and maintenance of the system.
The current Price Controller is a Vue.js frontend with Websocket-based backend.
An early prototype of the Price Controller was a physical aluminum knob connected to an LED display. This version was written in Circuit Python and ran on an Adafruit QT Py RP2040 board.