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The goal of this project is to build something that resembles the optics of a certain type of sci-fi device which controls something by putting transparent plates at specific places. Examples include the [https://stargate.fandom.com/wiki/Control_crystal#Ancients Ancient control crystals in Stargate] (which gave the project its name) and control plates in [https://en.wikipedia.org/wiki/The_Expanse_(TV_series) The Expanse].
Important features are:
* transparent plates
* a holder with slits to insert the plates
* *lots* of 135 degree angles (because sci-fi!)
* illumination of the plates
* inserting the plates triggers some feature (what exactly, I don't care) -> it will just publish which plate is inserted via MQTT, and you can connect whatever you want to that
* proper security: Full (client+server) certificate-based TLS authentication+encryption
* configurable in the number of slots, size etc.
=== Design overview ===
==== Construction ====
The visible casing and the plates are laser-cut acrylic plates. They can be engraved as suitable.
The casing is mounted onto a 3D-printed backplane, which also holds multiple switches. The switches are pressed by protrusions of the inserts (which of course have 135 degree angles!). The slits on the side have a backside made of diffuse acrylic with LEDs mounted behind them to allow illumination of the inserts.
==== Electronics ====
The system is controlled by an ESP32 running ESP-IDF and FreeRTOS.
The switches are handled by I2C port expanders. The LED strips are controlled by WS2812 chips.
Important features are:
* transparent plates
* a holder with slits to insert the plates
* *lots* of 135 degree angles (because sci-fi!)
* illumination of the plates
* inserting the plates triggers some feature (what exactly, I don't care) -> it will just publish which plate is inserted via MQTT, and you can connect whatever you want to that
* proper security: Full (client+server) certificate-based TLS authentication+encryption
* configurable in the number of slots, size etc.
=== Design overview ===
==== Construction ====
The visible casing and the plates are laser-cut acrylic plates. They can be engraved as suitable.
The casing is mounted onto a 3D-printed backplane, which also holds multiple switches. The switches are pressed by protrusions of the inserts (which of course have 135 degree angles!). The slits on the side have a backside made of diffuse acrylic with LEDs mounted behind them to allow illumination of the inserts.
==== Electronics ====
The system is controlled by an ESP32 running ESP-IDF and FreeRTOS.
The switches are handled by I2C port expanders. The LED strips are controlled by WS2812 chips.
