ESP8266 Infrared transmitter

MennoLabs · October 14, 2023, 3:53pm

I successfully installed v1.6.0 on an ESP8266MOD.
It successfully decodes signals with a receiver connected to D4.
So far so good.
The outgoing signals however, are not on D0, but on Tx.
Tx is high (3,3V in rest) and gets pulled low when I send a code to it.
Vmin is about -0.24V.
Is there a way to change this behaviour, or an electronic trick to invert this, so I still can drive an IR LED?
As for connecting the IR LED, I see lots of different setups. Here a transistor is used, some sites use a resistor, other sites just connect the LED directly. I myself was thinking about using an optocoupler.

MennoLabs · October 14, 2023, 9:40pm

Thinking about it: Tx being high should not have to be a problem. Bias the LED the other way, it can also sink current, right?

1technophile · October 15, 2023, 11:08pm

If not working with TX you could try with another pin?

github.com

1technophile/OpenMQTTGateway/blob/dfa94588d6193b568d120a51039e3e00070b8c38/main/config_IR.h#L193


      
          //#define IR_PANASONIC
          #endif
          
          #ifndef IR_EMITTER_INVERTED
          #  if defined(ESP8266) || defined(ESP32)
          #    define IR_EMITTER_INVERTED false //set to true if you want to reverse the LED signal for the emitter
          #  endif
          #endif
          
          /*-------------------PIN DEFINITIONS----------------------*/
          #ifndef IR_RECEIVER_GPIO
          #  ifdef ESP8266
          #    define IR_RECEIVER_GPIO 2 //D4 /replace by 4 with sonoff rf bridge
          #  elif ESP32
          #    define IR_RECEIVER_GPIO 26
          #  elif __AVR_ATmega2560__
          #    define IR_RECEIVER_GPIO 2 // 2 = D2 on arduino mega
          #  else
          #    define IR_RECEIVER_GPIO 0 // 0 = D2 on arduino UNO
          #  endif
          #endif

It was set to TX to free pins for other modules.

MennoLabs · October 17, 2023, 4:10pm

I ordered an ESP32. So I can also use the WEB-UI.