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Revision as of 21:18, 22 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.
Location
Technical Details (see git repo)
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)
MQTT Topics
Commands
| 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]
|
Status
| 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) |
Limitations
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 QPW command for querying its current power status, the projector just does not seem to respond to it in the way mentioned in the manual.[1]