UART Switch Help

ESPHome
1

Hey guys,

ive been trying for ages to get the UART switch working,

I have a TV that I am trying to control via RS232, I have a logic voltage to RS232 converter, and using a USB TTL adapter, I can control the TV from the Arduino IDE by sending commands,

but sending the same commands from ESPHome does nothing,

I think its in how im sending the data, I dont think the CR and NL are sending…

I have tried formatting it in several ways,

heres what im currently working with:

uart:
  baud_rate: 38400
  tx_pin: D4

switch:
  - platform: uart
    name: "Power On"
    data: '0x80 0x79 0x87 0x82 0x32 0x32 0x32 0x49 0x0D 0x0A'
  - platform: uart
    name: "Power Off"
    data: '0x80 0x79 0x87 0x82 0x32 0x32 0x32 0x48 0x0D 0x0A'
  - platform: uart
    name: "HDMI 1"
    data: 'INSP  10\r\n'
  - platform: uart
    name: "HDMI 2"
    data: 'INSP  13\r\n'
  - platform: uart
    name: "HDMI 3"
    data: 'INSP  18\r\n'

I have tried ASCII, both HEX and Decimal, plain text, as seen in the code above, but nothing seems to work :frowning:

Please can someone give me any ideas as I have run out?

To clarify, the hardware works, and it SHOULD control the TV, but something about what im sending from the ESP doesnt work…

EDIT:

This PDF explains the simple command structure:
https://support.sharp.net.au/downloads/faqattach/RS232C_control_guide.pdf

I have also tried using commas:

  - platform: uart
    name: "Power On"
    data: '0x50, 0x4f, 0x57, 0x52, 0x20, 0x20, 0x20, 0x31, 0x0a, 0x0d'
  - platform: uart
    name: "Power Off"
    data: '0x50, 0x4f, 0x57, 0x52, 0x20, 0x20, 0x20, 0x30, 0x0a, 0x0d'

Additionally, if I send for example, just 'INPS ’ the monitor will reply with the current selected input, likewise, just 'POWR ’ will tell me if the monitor is ON or OFF, am I able to use this as a sensor of some kind?

Thank you,

2

Your code looks nothing like the example here: https://esphome.io/components/switch/uart.html

In particular

data: '0x80 0x79 0x87 0x82 0x32 0x32 0x32 0x49 0x0D 0x0A'

should be

data: [0x80, 0x79, 0x87, 0x82, 0x32, 0x32, 0x32, 0x49, 0x0D, 0x0A]
3

Thanks,

Just tried that using both formats but with square brackets and same thing, not working :frowning:

4

I would connect the working arduino to a usb serial adapter an monitor with a pc what I get there. Then connect to the esp and do the same. You’ll quickly learn if you have software or hardware issues.

5

Have done that, the only difference is I don’t see line break from Arduino but when I send manually with keyboard I see it

6

If it is line break, you have a few options:
0x0A is LF
0x0D is CR

you can try

  • 0x0A, 0x0D
  • 0x0D, 0x0A
  • 0x0A
  • 0x0D,

however I think you did not answer my question, have you connected the ESP to a serial adapter and see if you get the command from the ESP when you trigger the action?

The right syntax is as @nickrout posted, don’t bother with the '0x80 ... ' syntax, that’s for strings

Can you share a picture with the hardware wirings?

7

+1 on this for doing a lot of serial control since ages, it depends of equipments controled so always better to try the 4 possibilities :wink:

8

I have indeed ruled out the hardware, see this screenshot

The first commands are from Arduino IDE, the tv responds, the long line is from ESPHome.

It’s typing out \r rather than entering a return.

Screenshot_20190625-070615_Photos
Screenshot_20190625-070615_Photos1873×1440 1.57 MB

9

Screenshot_20190625-070653_Photos
Screenshot_20190625-070653_Photos1440×3040 2.03 MB

Screenshot_20190625-070700_Photos
Screenshot_20190625-070700_Photos1440×3040 1.82 MB

Screenshot_20190625-070708_Photos
Screenshot_20190625-070708_Photos1440×3040 1.46 MB

10

It should just be CR, as the manual specifies it. But I have tried the others too…

11

It is impossible to give much advice without knowing exactly which yaml file you are using. You say you have tried lots of things, but I do not think you have shown us the file that corresponds to that test!

12

I’ll add, in the example you have given, you have only specified a tx_pin, not an rx_pin. Maybe the TV is balking at not being able to send data? (probably not!)

13

Pfff my eyes!!
Those ascii codes 0x80, 0x79 … are prefixed with 0x which means they are hexadecimal numbers.
Now if you want a P then and O the right numbers are 80, 79 etc. Decimal form. Check out an ascii table

I don’t know why it does not work in string form

14

I have tried all the formats mentioned in the post…

15

The tv doesn’t need to send data back, the test worked fine using a PC with only tx

16

So I can try using just the numbers without the 0x? This is the stuff I don’t know so I’ll try this !

I don’t know how to format the data…

17

You produced a specific output but we don’t know what produced that output. Hard to help.

@glmnet is right though (of course!). Either use hex, in which case P is 0x50, or decimal in which case P is 80 (no 0x in front.)

Carriage return is 0x0D hex, 13 decimal. See https://en.wikipedia.org/wiki/UTF-8#Codepage_layout

If you use hex, the format is documented in the esphome docs, and in my post above.

If you want to tell us that something does, or doesn’t, work please post the yaml file you are feeding to esphome. Please also tell us what esp device you are using.

18

Thank you all for your help!

Its finally working,

this is the code im running now:

esphome:
  name: sharptv
  platform: ESP8266
  board: d1_mini

wifi:
  ssid: 'x'
  password: 'x'

api:

# Enable logging
logger:

ota:

mqtt:
  broker: 172.16.0.60
  username: rs232
  password: x

uart:
  baud_rate: 38400
  tx_pin: D4

switch:
  - platform: uart
    name: "Power On"
    data: [0x50, 0x4F, 0x57, 0x52, 0x20, 0x20, 0x20, 0x31, 0x0D, 0x0A]
    on_turn_on:
      then:
      - mqtt.publish:
          topic: esphome/rs232/sharp/state
          payload: "ON"

  - platform: uart
    name: "Power Off"
    data: [0x50, 0x4F, 0x57, 0x52, 0x20, 0x20, 0x20, 0x30, 0x0D, 0x0A]
    on_turn_on:
      then:
      - mqtt.publish:
          topic: esphome/rs232/sharp/state
          payload: "OFF"

  - platform: uart
    name: "HDMI 1"
    data: [0x49, 0x4E, 0x50, 0x53, 0x20, 0x20, 0x31, 0x30, 0x0D, 0x0A]
    on_turn_on:
      then:
      - mqtt.publish:
          topic: esphome/rs232/sharp/input
          payload: "HDMI1"

  - platform: uart
    name: "HDMI 2"
    data: [0x49, 0x4E, 0x50, 0x53, 0x20, 0x20, 0x31, 0x33, 0x0D, 0x0A]
    on_turn_on:
      then:
      - mqtt.publish:
          topic: esphome/rs232/sharp/input
          payload: "HDMI2"

  - platform: uart
    name: "HDMI 3"
    data: [0x49, 0x4E, 0x50, 0x53, 0x20, 0x20, 0x31, 0x38, 0x0D, 0x0A]
    on_turn_on:
      then:
      - mqtt.publish:
          topic: esphome/rs232/sharp/input
          payload: "HDMI3"

I think it not working before might have had something to do with garbage left in the serial buffer?

after hooking up between TV and USB TTL a few times, I noticed it would respond after sending a few commands, i think it cleared out the leftover and then input the command again cleanly (sorry I dont know how to word it)

but thanks its working well now !

Now I just have to figure out how to send the value of an input number to the TV to adjust the volume…

19

Pleased you got it going.

There doesn’t seem to be an option for audio volume, which is a little odd, there is otherwise a good variety of controllable stuff on that TV - kudos to Sharp.

Are you actually listening on the TV or an external amp? May be asier to control the amp.

Also you may be able to control volume on the device which is plugged into the TV to provide your media. That is a bit vague isn’t it? An example: I use kodi for watching all my media. Even if I cannot control the TV volume, I can adjust the volume at the input level by controlling Kodi.

20

Oh man I swear there was a command for volume, ill check my other docs…

I listen through an external amp but it’s not controllable, it’s a date a2670 I think?

The thing playing is kinda possible but only for the android tv, there’s still the switch and side HDMI port I would love to control volume over just in case :thinking: