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In the following two lines, you create variables to assign pins: const int buttonPin = 4 read the state of the pushbutton value initialize the pushbutton pin as an input variable for storing the pushbutton status Complete Instructions: Ĭonst int buttonPin = 4 // the number of the pushbutton pinĬonst int ledPin = 5 // the number of the LED pin We’ll read the state of the pushbutton and light up the LED accordingly as illustrated in the following figure.Ĭopy the following code to your Arduino IDE. To show you how to use digital inputs and digital outputs, we’ll build a simple project example with a pushbutton and an LED. Take a look at the ESP8266 GPIO Reference Guide to learn which GPIOs are more suitable to use as inputs. To read a digital input, like a button, you use the digitalRead() function, that accepts as argument, the GPIO (int number) you are referring to. ESP8266 NodeMCU Read Digital Inputsįirst, set the GPIO you want to read as INPUT, using the pinMode() function as follows: pinMode(GPIO, INPUT) Take a look at the ESP8266 GPIO Reference Guide to learn which GPIOs are more suitable to use as outputs. To control a digital output you just need to use the digitalWrite() function, that accepts as arguments, the GPIO (int number) you are referring to, and the state, either HIGH or LOW. Use the pinMode() function as follows: pinMode(GPIO, OUTPUT) Installing ESP8266 Board in Arduino IDE (Windows, Mac OS X, Linux)įirst you need set the GPIO you want to control as an OUTPUT.So, make sure you have the ESP8266 boards add-on installed before proceeding: We’ll program the ESP8266 using Arduino IDE.