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Now, I press the "ON" button on the node-red 4-5 times, the C0 pin of the PIC is clicked on the 5v level. The "OFF" button is the same.

Aside from the electrical mismatch which needs to be corrected, my money is on this:

#INT_RDA
void ngat()
{
k=getch();
}

No circular buffer to hold the repl ...

The Arduino used TTL input thresholds. The PIC uses Schottky on the SPI.

Thanks very much

Please read the Ardunio datasheet as for the electrical specifications for whatever pins are used, compare those to the PIC data I refer to.

Thanks very much. I will try again

Sorry it won't work..
The PIC UART rcv pin is the ST type, which according to the datasheet Electrical charateristic 15.2, parameterD041 requires a MINIMUM of 80% of VDD. Given a VDD of 5 volts, 80% ...

That is a 5 volt PIC, the ESP8266 is a 3 volt device.
Now I have to assume you're actually using an ESP8266 MODULE, not just the 'chip'(there is a HUGE difference) so you need to post a link to the ...

Hi everybody,
Currently I am doing PIC 16f877a communication with esp8266 v1 (using node-red). I've been transmitting data from PIC to node-red, but when I transmit from node-red to PIC it's not. Alt ...