Drawbox makes this communication possible with the oldest form of messaging, drawing. This enables the transmitter to record a movement with pen on paper. Then sent via a server, and then traced on the recipient's drawbox. In addition, the drawing area can be rolled up again.
In the beginning of our project we brainstormed and researched ideas. We got inspired by an iPhone app and came up with an idea for easy sharing drawings. Our research showed that a two-arm drawing mechanism made the most sense. One arm sends and one receives. To make it even better, we added a conveyor belt mechanism for users to rewind the drawing area. A 3D-printed arm with two potentiometers records the sender's movement and sends the values via MQTT and a Node server to the receiver's arm. The receiver's arm has three servo motors. Two record the potentiometer and the third lifts the pen at the front for each movement. Large data packets are divided into small ones on the server side to enable efficient data transmission without crashing the microcontroller.