ESP8266 NodeMCU Module – GPIO

 

ESP8266 NodeMCU Devkit GPIO Pin Map

 

 

IO index ESP8266 pin IO index ESP8266 pin
0 [*] GPIO16 7 GPIO13
1 GPIO5 8 GPIO15
2 GPIO4 9 GPIO3
3 GPIO0 10 GPIO1
4 GPIO2 11 GPIO9
5 GPIO14 12 GPIO10
6 GPIO12

 

 


 ESP8266 NodeMCU Module GPIO Functions

gpio.mode() Initialize pin to GPIO mode, set the pin in/out direction, and optional internal weak pull-up.
gpio.read() Read digital GPIO pin value.
gpio.serout() Serialize output based on a sequence of delay-times in µs.
gpio.trig() Establish or clear a callback function to run on interrupt for a pin.
gpio.write() Set digital GPIO pin value.
gpio.pulse This covers a set of APIs that allow generation of pulse trains with accurate timing on
multiple pins.
gpio.pulse.build This builds the gpio.
gpio.pulse:start This starts the output operations.
gpio.pulse:getstate This returns the current state.
gpio.pulse:stop This stops the output operation at some future time.
gpio.pulse:cancel This stops the output operation immediately.
gpio.pulse:adjust This adds (or subtracts) time that will get used in the min / max delay case.
gpio.pulse:update This can change the contents of a particular step in the output program.

 

Note : [*] D0(GPIO16) can only be used as gpio read/write. No support for open-drain/interrupt/pwm/i2c/ow.


 

Pr-Request

 

GPIO pin set as input

  • if you have questions like How set GPIO pin as input in ESP8266? then refer the below contents

 

Required

  • ESP8266 Any module or NodeMCU Development Kit(Any Version)
  • ESPlorer
  • Wires (Optional)

Note : if your using ESP8266 module only you need to know basic connection diagram of ESP8266

 

Code

 

 


GPIO pin set as output

  • Set GPIO pin as output using gpio.mode()  function.
  • Example : gpio.mode(pin, gpio.INPUT)

 

Code

 

Result

 

 


GPIO pin status monitor

  • GPIO pin monitor status is very useful, because if you wanna monitor the pin status based on do the some process can easily.
  • Example : continuously monitor the gpio input button pin and based on button pin low/high level trun on/off the led.

 

Required

  • ESP8266 Any module or NodeMCU Development Kit(Any Version)
  • ESPlorer
  • Wires (Optional)

Note : if your using ESP8266 module only you need to know basic connection diagram of ESP8266.

 

Basic connection Diagram

Note : this below diagram for flash nodeMCU Firmware to ESP8266. We use the same circuit. But GPIO-0 Should be High or float Mode

 

Code

 

 


 

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