THREE Turntable I2C Communication API

This documentation describes the I2C communication protocol used by the Matter and Form THREE 3D scanner to control its turntable. This specification allows third-party developers to build compatible turntables that will work seamlessly with the THREE master device.

Documentation Overview

This API documentation is organized into the following sections:

1. Command Reference - Detailed reference for each command supported by the protocol

2. Integration Guide - Practical guidance for implementing a compatible turntable including hardware requirements, behavior expectations, and timing constraints

3. Examples - Common communication sequences and example implementations

4. Quick Reference - Quick reference with specs and values

Quick Start

Your turntable must:

• Respond to I2C 7-bit slave address 0x45
• Implement the required command set (STOP_ROT, STATUS_W_POS, POSITION, ROTATE_ABS, RAMP_DIST, ERROR)
• Use CRC-8 with polynomial 0x07 for data integrity
• Support 360-degree absolute positioning with 1-degree resolution
• Report status and position accurately

Hardware Requirements

• I2C slave device operating at standard I2C speeds (100 kHz or 400 kHz)
• Rotary encoder or equivalent position sensing with 1-degree resolution
• Motor control capable of smooth rotation and positioning
• 360-degree continuous rotation capability

Protocol Version

This documentation describes the protocol used by the THREE scanner as of 2024-10-20.

Support

This is a third-party integration specification. The protocol is provided as-is for developers who wish to create compatible turntables for use with the THREE scanner.

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