LCD/DLP Projector Serial Control~
This feature is not included in precompiled binaries
To use it you must compile your build. Add the following to
Mandatory: choose the communication protocol for your Projector (either NEC or OPTOMA, not both) by adding the following to
Optional: set the Relay that powers your device (default is 1) by adding the following to
#define PROJECTOR_CTRL_PWR_BY_RELAY 1 //the relay that powers the Projector
Optional: set the baudrate to communicate to your device (default is 9600) by adding the following to
#define PROJECTOR_CTRL_SERIAL_BAUDRATE 9600
Optional: enable debugging messages by adding the following to
This driver simulates an additional relay in your Tasmota device. If you have N physical relays and you configure GPIO pin functions
DLP Tx and
DLP Rx you'll see relay (N+1) after reboot. The two GPIO pins will be used for serial communication with your LCD or DLP Projector. The communication protocol is unique for each manufacturer (compile-time option). The driver polls the Projector's state periodically and updates the fake relay state. When you toggle the fake relay, serial commands are sent to the Projector to power it up or down. While the Projector is running, the driver prevents to switch off the real relay that feeds the Projector. This protects the lamp of the projector (needs to be cooled down before power is cut from the device).
Originaly tested with NEC V300W. All models from NEC should be fine. Commands for OPTOMA devices were supplied but never tested with real device. Fixes and definitions for further manufacturers should go to
Connect your Tasmota GPIO pins (3.3V TTL level) to a MAX3232 interface (cheap items on internet sales). Such interface changes TTL signals to proper RS232 levels. There are 4 wires on TTL side (Vcc,GND,Rx,Tx) and 3 wires on RS232 side (GND,Tx,Rx). A wire jumper between pins 7(RTS) and 8(CTS) may be needed in DSUB9 connector going to Projector.
- set GPIO1 to
- set GPIO3 to
- save and reboot
Check your Projector settings concerning Serial port. It must match Tasmota settings eg. 9600 8N1. Some models have "ID number" feature to allow several Projectors in one room. The control commands in Tasmota contain ID 0. Please switch off the "ID" control completely or set the ID to 0.