What is NodeMCU GPIO pin?
What is NodeMCU GPIO pin?
General-purpose input/output (GPIO) is a pin on an IC (Integrated Circuit). It can be either an input pin or output pin, whose behavior can be controlled at the run time. NodeMCU Development kit provides access to these GPIOs of ESP8266.
What pins to use on NodeMCU?
ESP8266 12E NodeMCU Development Board pinout
No. of Pin | Label | Description |
---|---|---|
1 | SD2 | Data pin 0 for SDIO interface and also used as GPIO9. |
1 | SD3 | Data pin3 for SDIO interface and also used as GPIO10. |
2 | RSV | Reserved pins. |
11 | D0 to D8, RX, TX | Input/output pins also used for UART, SPI, I2C, Flash and wake pin. |
How many GPIO pins are there in NodeMCU?
17 GPIO pins
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. Each digital enabled GPIO can be configured to internal pull-up or pull-down, or set to high impedance.
How do I program ESP8266 GPIO pins?
Now, connect the ESP8266 using these instructions:
- VCC will be connected to the 3.3V power supply.
- GPIO0 and GPIO2 are general purpose digital ports.
- Rx: Goes to Arduino pin0 (But needs a voltage adjusting)
- CH_PD: Chip enable.
- RST: Reset.
- GND is ground.
- Tx: Goes to Arduino pin1.
How many analog pins are in NodeMCU?
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.
Which pins can I use ESP8266?
Usable pins The ESP8266 has 17 GPIO pins (0-16), however, you can only use 11 of them, because 6 pins (GPIO 6 – 11) are used to connect the flash memory chip. This is the small 8-legged chip right next to the ESP8266. If you try to use one of these pins, you might crash your program.
What are the pins on a Raspberry Pi for?
The GPIO pins are one way in which the Raspberry Pi can control and monitor the outside world by being connected to electronic circuits. The Pi can control LEDs, turning them on or off, drive motors, and interact with many other objects.