ESPEasy to control video projector and roller screen ?

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tparvais
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Joined: 28 Oct 2015, 23:13

ESPEasy to control video projector and roller screen ?

#1 Post by tparvais » 04 Jun 2019, 15:13

Hello

I've an old samsung video projector I want to offer and install in a school for kids. This videoprojector can be remotely control via RS232C standard (jack 3.5mm).
manual: https://www.projectorcentral.com/pdf/pr ... l_5152.pdf

I don't have the cable.

different questions:

-any idea if this serial port if fully compatible with ESPEasy & Wemos D1 ? Or should I use level converter ? TTL 0-5V ok for ESP ? , Serial -15V ? ...
-is there a standard for jack 3.5mm serial interface ? gnd/TX/RX ?
-I need to remote control this projector from an ESPeasy with few buttons. how is it possible to send a set of bytes from ESPEasy in an easy way ? I think to create a rule reacting to each button press (on , off, vga , hdmi, ...) . the wiki is not clear for me on how to send bytes to serial interface. which GPIO's should I use for RX/TX ? Can we use 9600 8N1 ? do you have example on concrete example of commands sent via serial interface ?

Thank you very much

ThomasB
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Joined: 17 Jun 2018, 20:41
Location: USA

Re: ESPEasy to control video projector and roller screen ?

#2 Post by ThomasB » 04 Jun 2019, 21:56

any idea if this serial port if fully compatible with ESPEasy & Wemos D1 ?
RS232C will need to be converted to TTL. For example:
https://www.aliexpress.com/wholesale?ca ... X3232+mini

is there a standard for jack 3.5mm serial interface ? gnd/TX/RX ?
Not a global industry standard configuration. But perhaps there is a "standard" 3.5mm serial control for Samsung equipment. If you can't find that then roll up your sleeves. First ID the jack's ground pin with a continuity tester (ohm each pin to chassis ground). Then flip a coin to pick the projector's RxD pin, try it out, rinse & repeat if necessary.
I need to remote control this projector from an ESPeasy with few buttons. how is it possible to send a set of bytes from ESPEasy in an easy way ?
It appears your rules could send the data using the serialsend command. Check out mikeluyten's comments for some tips: https://github.com/letscontrolit/ESPEasy/issues/539

- Thomas

tparvais
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Posts: 22
Joined: 28 Oct 2015, 23:13

Re: ESPEasy to control video projector and roller screen ?

#3 Post by tparvais » 04 Jun 2019, 22:22

thanks, I appreciate your help

I've created a cable with a jack and GND/RX/TX connected to ESP

I've create a serial interface with 9600 8N1 parameters

with telnet session with Putty, I'm searching how to send following hexa:
0x08 0x22 0x00 0x00 0x00 0x16

as serialsend command accept onoy "textual" string

T.

ThomasB
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Posts: 284
Joined: 17 Jun 2018, 20:41
Location: USA

Re: ESPEasy to control video projector and roller screen ?

#4 Post by ThomasB » 05 Jun 2019, 00:09

I've created a cable with a jack and GND/RX/TX connected to ESP
Great. Don't forget that the projector's RS232C uses bipolar signals that need some additional circuitry to safely interface to ESP's 3V TTL.
serialsend command accept only "textual" string
Drat. Too bad your projector doesn't accept textual commands. Hopefully someone else chimes-in with a workaround.

- Thomas

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