#2 NodeMCU/ ESp8266 Tutorial: GPIO (Digital Input and Output)

In this video we have had look at how to use the pin as input and output. We have talked about two different pinMappings and GOIO trap to avoid when designing your own device with esp-12e module and the internal pull up resistors.
We have measured the GPIO speed and finally we have seen the IO rating and made a LED circuit with current limiting resistor.
The diagram of ESP-12E module is taken from: www.esp8266.co...

[@DIYOP]

You have explained very well and all my queries has be resolved as I'm tired of search the idea to install a regular wall switch with relay in my home automation project thankyou

[@dearaelectric]

thanks bro..

[@isosolutions6747]

Well Done....

[@nhatminh1209]

I used a esp8266 together with a Touch Module (TTP223). In the code i put GPIO 2 to be INPUT (to read the signal from TTP223) but when I press the TTP223, the ESP8266-01 can not control the Relay.

[@MohammedRezwanulIslam]

It is hard to solve your problem without looking at the hardware setup and the software.

[@nhatminh1209]

This is my Diagram, sorry for ugly draw :)
media9.hopto.org:81/GPIO/IMG_2487.JPG

[@nhatminh1209]

And this is ESP 8266-01 Module: github.com/IOT-MCU/ESP-01S-Relay-v4.0/blob/e102ac8e912e186e81b031334f095fb14c6abab7/ESP-01S%20Relay%20v4.0.pdf

[@nhatminh1209]

and here is the code:
//------------------------------------------------------------------------
// Assign output variables to GPIO pins
const int touchPin = 2; //connect output from the Touch Module TTP223 to this pin on ESP8266
const int output0 = 0; //ĐÈN 2 Chân GPIO 0 ket noi voi Relay
int val = 0;
void setup() {
Serial.begin(115200);
// Initialize the output variables as outputs
pinMode(touchPin, INPUT);
pinMode(output0, OUTPUT);
// Set outputs to
digitalWrite(output0, LOW);
//--------------------------------------------------------
and more code:
//------------------------------------------------------------------------
// turns the GPIOs on and off
if (header.indexOf("GET /0/on") >= 0) {
Serial.println("GPIO 0 on");
output0State = "ON";
den2state = "BẬT";
digitalWrite(output0, LOW);
val = digitalRead(touchPin); //Read value from the TTP223 Touch
if(val ==1){
Serial.println("Touched");
digitalWrite(output0, HIGH);
}
} else if (header.indexOf("GET /0/off") >= 0) {
Serial.println("GPIO 0 off");
output0State = "OFF";
den2state = "TẮT";
digitalWrite(output0, HIGH);
val = digitalRead(touchPin); //Read value from the TTP223 Touch
if(val ==1){
Serial.println("Touched");
digitalWrite(output0, LOW);
}
}
//------------------------------------------------------------------------

[@nhatminh1209]

Can you working on it? Mohammed?