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ESP8266 Pinout | Pins and Their Features of ESP8266 SoC


Espressif’s ESP8266 is a Wi-Fi SoC. It has all of the bells and whistles for Wi-Fi Community connectivity in addition to a really highly effective processor. You’ll be able to construct purposes utilizing ESP8266 SoC alone however when you’ve got a bunch MCU, then it may act as a slave as properly. There are ESP8266 modules accessible available in the market that you should use in your tasks. However earlier than beginning, you need to be aware of the pinout of the SoC in addition to the module. So, on this tutorial, we’ll check out the ESP8266 Pinout.

First, we’ll see the pinout of the ESP8266 SoC. As ESP8266 Wi-Fi Chip is out there in a number of modules, we may even see the pinout of a few of these modules.

A Temporary Be aware on ESP8266

The ESP8266 Wi-Fi Module modified the DIY and Hobbyist scene utterly. It paved the best way for small creators to construct IoT and ‘Sensible’ issues. You’ll be able to design a Sensible Bulb or Sensible Relay utilizing ESP8266.

Because it has a robust microprocessor, you should use it as a standalone system for the processor in addition to for Wi-Fi connectivity. However the advantage of ESP8266 is that you should use one other processor because the ‘major processing unit’ and use the ESP8266 simply as a Wi-Fi chip.

ESP3266 Pinout

We are going to begin understanding the pins of the ESP8266 with the principle SoC itself. ESP8266 SoC is out there in a 32-pin QFN Package deal (33 for those who think about the middle GND pad).

The next picture reveals the pin format of the ESP8266 SoC.

ESP8266-Pinout-SoC-Image-1

From the above ESP8266 Pinout, you possibly can see that it has only one pin (Pin 2 – LNA) for the RF Interface. This reveals the extent of integration ESP8266 has. Coming to the pins themselves, the next desk reveals the pin description of all of the ESP8266 pins.

Pin Quantity Title Description
1 VDDA Analog Energy Provide
2 LNA RF Antenna Interface
3 VDD3P3 Amplifier Energy Provide
4 VDD3P3 Amplifier Energy Provide
5 VDD_RTC NC
6 TOUT ADC Pin
7 CHIP_EN Chip Allow
8 XPD_DCDC Deep Sleep Wakeup
9 MTMS GPIO 14 / HSPI_CLK
10 MTDI GPIO 12 / HSPI_MISO
11 VDDPST Digital IO Energy Provide
12 MTCK GPIO 13 / HSPI_MOSI / UART0_CTS
13 MTDO GPIO 15 / HSPI_CS / UART0_RTS
14 GPIO 2 GPIO 2 / UART TXs
15 GPIO 0 GPIO 0 / SPI_CS2
16 GPIO 4 GPIO 4
17 VDDPST Digital IO Energy Provide
18 SDIO_DATA_2 SD_D2 / SPIHD / HSPIHD / GPIO 9
19 SDIO_DATA_3 SD_D3 / SPIWP / HSPIWP / GPIO 10
20 SDIO_CMD SD_CMD / SPI_CS0 / GPIO 11
21 SDIO_CLK SD_CLK / SPI_CLK / GPIO 6
22 SDIO_DATA_0 SD_D0 / SPI_MISO / GPIO 7
23 SDIO_DATA_1 SD_D1 / SPI_MOSI / GPIO 8
24 GPIO 5 GPIO 5
25 U0RXD UART RX / GPIO 3
26 U0TXD UART TX / GPIO 1 / SPI_CS1
27 XTAL_OUT Crystal Oscillator Output
28 XTAL_IN Crystal Oscillator Enter
29 VDDD Analog Energy Provide
30 VDDA Analog Energy Provide
31 RES12K Serial Reference to 12 KΩ Resistor
32 EXT_RSTB Exterior Reset Sign
33 GND Floor Pad

ESP-01 Pinout

The ESP-01 is without doubt one of the easiest ESP8266 modules accessible right now. Ai-Thinker developed this module. It has the principle SoC, crystal oscillator, flash reminiscence, and a PCB antenna.

There are additionally 8 fundamental pins for programming in addition to energy. The next picture reveals the pins format of ESP-01.

ESP8266 Arduino Image 2

Out of the 33 pins of ESP8266 SoC, the ESP-01 Module

Pin Title Pin Perform
VCC Energy Provide – 3.3V solely
GND Floor
TX UART TX
RX UART RX
RST Reset
CH_PD Chip Allow
GPIO 0 GPIO 0
GPIO 2 GPIO 2

NodeMCU Pinout

Whereas ESP-01 is the naked minimal ESP8266 Module, the NodeMCU is a well-liked compressive answer. It’s a correct ESP8266 Improvement board with all the required connectors and parts.

NodeMCU-Parts-on-Board

NodeMCU makes use of ESP-12E Module, once more by Ai-Thinker. This module, just like the ESP-01, has the SoC, Crystal Oscillator, and Wi-Fi Antenna. All of the important issues for ESP8266 SoC. The primary distinction between ESP-01 and ESP-12E is the variety of GPIO Pins.

Coming again to NodeMCU, it takes the ESP-12E as the bottom board and builds an entire system round it. The next picture reveals the Pinout of NodeMCU.

NodeMCU-Pinout-Image

It has 30 pins. You’ll be able to see the pin description of all these 30 pins within the following desk.

Pin Description Alternate Features Default
ADC0 Analog Enter  — ADC0
Reserved  —  —
Reserved  —  —
SDD3 SDIO Information 3 GPIO10 SDD3
SDD2 SDIO Information 2 GPIO9 SDD2
SDD1 SDIO Information 1 GPIO8 SDD1
SDDCMD SDIO CMD GPIO11 SDDCMD
SDD0 SDIO Information 0 GPIO7 SDD0
SDCLK SDIO CLK GPIO6 SDCLK
GND Floor  —  —
3.3V 3.3V Output  —  —
EN Chip Allow (Energetic HIGH)  —  —
RST Reset (Energetic LOW)  —  —
GND Floor  —  —
VIN 5V Enter to three.3V Regulator  —  —
3.3V 3.3V Output  —  —
GND Floor  —  —
TXD0 UART0 TXD GPIO1 TXD0
RXD0 USRT0 RXD GPIO3 RXD0
GPIO15 GPIO15 HSPI_CS / RTS0 GPIO15
GPIO13 GPIO13 HSPI_MOSI / CTS0 GPIO13
GPIO12 GPIO12 HSPI_MISO GPIO12
GPIO14 GPIO14 HSPI_SCK GPIO14
GND Floor  —  —
3.3V 3.3V Output  —  —
GPIO2 GPIO2 UART1 TXD GPIO2
Flash Flash GPIO0 Flash
GPIO4 GPIO4 Software program SDA (I2C) GPIO4
GPIO5 GPIO5 Software program SCL (I2C) GPIO5
GPIO16 GPIO16 Wake (deep sleep) GPIO16

ESP-12E Pinout

You’ll be able to design your personal NodeMCU when you’ve got the ESP-12E Module. For that, you should be aware of the Pinout of ESP-12E. The next picture reveals the pinout of the ESP-12E Module.

ESP-12E-Pinout

Right here is the pin description of all of the ESP-12E Pins.

Pin Perform
RST Reset the Module
ADC0 ADC Pin with 10-bit decision
EN Chip Allow Pin (energetic HIGH)
GPIO16 GPIO16 pin (wake pin from deep sleep mode)
GPIO14 GPIO14 pin (HSPI_CLK)
GPIO12 GPIO12 pin (HSPI_MISO)
GPIO13 GPIO13 pin (HSPI_MOSI)
VCC 3.3V Energy Provide (max 3.6V)
SDCMD SDIO CMD (GPIO11)
SDD0 SDIO Information 0 (GPIO7)
SDD2 SDIO Information 2 (GPIO9)
SDD3 SDIO Information 3 (GPIO10)
SDD1 SDIO Information 1 (GPIO8)
SCCLK SDIO CLK (GPIO6)
GND Floor Pin
GPIO15 GPIO15 pin (HSPI_CS)
GPIO2 GPIO2 pin (TXD1)
Flash Flash Pin (GPIO0)
GPIO4 GPIO4 pin (SDA – software program I2C)
GPIO5 GPIO5 pin (SCL – software program I2C)
RXD0 UART0 RXD pin (GPIO3)
TXD0 UART0 TXD (GPIO1)

Conclusion

Despite the fact that ESP32 is a extra highly effective and succesful SoC, the ESP8266 remains to be one of many well-liked decisions for Wi-Fi Chips. A number of DIY, in addition to skilled merchandise, combine ESP8266 in a single type or the opposite. That’s both straight as an SoC or as a Module.

Regardless, if you wish to design tasks utilizing ESP8266, then you need to be aware of the pins and pin features. On this information, we noticed the ESP8266 Pinout. First, we noticed the pinout of the principle ESP8266 SoC.

Then we noticed the pinouts of some well-liked modules equivalent to ESP-01 and ESP-12E. We additionally seemed on the pinout of NodeMCU.

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