How many pins can be used in NodeMCU?

How many pins can be used in NodeMCU?

17 GPIO pins
ESP8266 NodeMCU has 17 GPIO pins which can be assigned to various functions such as I2C, I2S, UART, PWM, IR Remote Control, LED Light and Button programmatically.

What is the purpose of RX & TX pins in NodeMCU?

ESP8266 Internal GPIO Pin number 2 pins out of 11 are generally reserved for RX and TX in order to communicate with a host PC from which compiled object code is downloaded.

How many analog pins are available in NodeMCU?

1 analog input pin
But all ESP8266 boards like the ESP8266 NodeMCU or the WeMos D1 Mini have one mayor downside: They have only 1 analog input pin. But you can increase the number of analog inputs with an analog multiplexer.

What are the D8 and D4 pins of the NodeMCU?

I understand that D8 (GPIO15), D4 (GPIO2) and D3 (GPIO0) pins of the NodeMCU have special boot-controlling uses. So how can I use those pins as generic digital pins. Any help is appreciated.

What is the DC pin for ESP8266 NodeMCU?

DC pin is connected to D3 (ESP8266EX GPIO0). If the display module has a CS pin (Chip Select) then it should be connected to NodeMCU pin D8 (GPIO15). Connecting the BLK pin is optional. The back light turns off when the BLK pin connected to the ground (GND).

Which is the correct pin mapping for NodeMCU?

So, the correct pin mapping is the following [1] [2] (NodeMCU on the left and ESP8266 on the right): LED_BUILTIN = GPIO16 (auxiliary constant for the board LED, not a board pin); Fortunately, this mapping is defined as constant on ESP8266 the libraries, so we don’t need to constantly check it.

How to use gpio0 / gpio15 pins on ESP8266?

This is a very short note on how to use GPIO0 / GPIO2 and GPIO15 pins on the ESP8266 module. ESP8266 is a low cost wifi enabled chip. It comes in a variety of module types and can be programmed in a variety of ways. All modules make GPIO0 and GPIO2 accessible.