RS232 Projector Controller: Difference between revisions

Revision as of 09:27, 24 September 2025

RS232 Projector Controller


Ort	Hackcenter
Besitzstatus	Leihgabe
Kontakt	ente
Git-Repo	https://github.com/chaosdorf/projector-controller-iot

Controls the projector via its RS232 interface. Integrated into HomeAssistant via MQTT. Source code on GitHub.

Attached to truss next to projector in Hackcenter.

µC: ESP32-S3-WROOM with 8MB flash, SP3232EEN-L/TR RS232 transceiver

Programmable via UART, JTAG, and theoretically USB (the data lines are swapped for this, and would need to be fixed with a knife and soldering iron)


Topic	Arguments	Description
`/projector-controller/cmd/power`	ON/OFF	Sends the main power commands
`/projector-controller/cmd/(menu\|enter\|up\|down\|left\|right\|back)`		Emulate keypresses
`/projector-controller/cmd/raw`	Binary data	Sends raw bytes over serial, framed with `[0x02, [...data] 0x03]`


Topic	Values	Description
`/projector-controller/availability`	online/(offline)	Publishes the controller's availability every couple of seconds
`/projector-controller/stat/power`	ON/OFF	Publishes the projector's power status (doesn't work)

There is a QPW command for querying its current power status, the projector only responds sometimes though.

@@ Line 59: / Line 59: @@
 == Limitations ==
-'''DO NOT SPAM POWER COMMANDS, IT BREAKS EVERYTHING'''
+There is a <code>QPW</code> command for querying its current power status, the projector only responds sometimes though.
-When the projector receives an invalid command—e. g. ''power on'' when it's already powered on—it just ignores all future commands until the serial cable is yanked and replugged. There is a <code>QPW</code> command for querying its current power status, the projector just does not seem to respond to it in the way mentioned in the manual.<ref>https://web.archive.org/web/20171028162105/http://www.projectorcentral.com/pdf/projector_manual_6589.pdf</ref>
 == References ==