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

• ESP8266 NodeMCU Build firmware
• ESP8266 NodeMCU Flash firmware
• ESp8266 NodeMCU IDE
• ESP8266 NodeMCU Hello World example

 

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

 

-- set pin index 1 to GPIO mode, and set the pin to high.
pin=3 --gpio-0
gpio.mode(pin, gpio.INPUT)
while true do
print("GPIO Read PIN Status : "..gpio.read(pin))
end

 

---

GPIO pin set as output

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

 

Code

pin = 3
gpio.mode(pin, gpio.OUTPUT)
gpio.write(pin,HIGH)
--gpio.write(pin, LOW)

 

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

• Source Code GitHub

--www.aruneworld.com/embedded/esp8266/esp8266-nodecmu

button_pin=3 --GPIO-0
gpio.mode(button_pin, gpio.INPUT)

while true do
    print("GPIO Read PIN Status : "..gpio.read(button_pin))
    tmr.delay(1000000)
end

 

 

---