Esp hardware serial: set TX pin LOW manually

Projects General Guidance
1

i use pin 19 as TX on esp32 to send data to "df player module" (uart)

` mp3_serial.begin(9600, SERIAL_8N1, -1, 19); // Begin serial communication

then when i dont need "df player module" i need to set pin 19 to low

digitalWrite(19, LOW);

so after this even if i set digitalWrite(19, HIGH); i cant communicate with df player module

is there any other way to set TX pin to low when i dont use serial communication with df player or this is the way and then need to do something to enable uart communication again

2

Why mess around with the Tx pin ? When you don't need DF Player simply don't write to it.

3

it consume lot of power, coz im in battery. i use pnp to stop dfplyaer but it still has power because of txt pin. when i set txt pin to low then df player dont consume power

4

Is the DF Player really getting power from the Tx pin ?

what happens if you use Serial.begin() when you want to start using the Serial interface again ?

5

yes

this is what i wanted to ask. if this is the way to do it do i need call serial.begin again or there is any other way to make pin low

6

I have no idea whether it will work. Why not try it ?

8

even if u stop vcc to df player. it still consume energy while tx pin is connected there, this is known issue of df plyaer.

10

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