ESP-12E - WiFi Module

17 October 2018 - 0 Comments

ESP-12E - WiFi Module

ESP12E WiFi Module Pinout

ESP-12Eis a miniatureWi-Fi modulepresent in the market and is used for establishing a wireless network connection for microcontroller or processor. The core of ESP-12E isESP8266EX,这是一个高集成无线SoC系统on Chip). It features ability to embed Wi-Fi capabilities to systems or to function as a standalone application. It is a low cost solution for developing IoT applications.

Pin Configuration

The ESP-12E module has twenty two pins and we will describe function of each pin below.

Pin	Name	Description
1	RST	Reset Pin of the module
2	ADC	Analog Input Pin for 10-bit ADC (0V to1V)
3	EN	Module Enable Pin (Active HIGH)
4	GPIO16	General Purpose Input Output Pin 16
5	GPIO14	General Purpose Input Output Pin 14
6	GPIO12	General Purpose Input Output Pin 12
7	GPIO13	General Purpose Input Output Pin 13
8	VDD	+3.3V Power Input
9	CS0	Chip selection Pin of SPI interface
10	MISO	味噌SPI接口的销
11	GPIO9	General Purpose Input Output Pin 9
12	GPIO10	General Purpose Input Output Pin 10
13	MOSI	MOSI Pin of SPI interface
14	SCLK	Clock Pin of SPI interface
15	GND	Ground Pin
16	GPIO15	General Purpose Input Output Pin 15
17	GPIO2	General Purpose Input Output Pin 2
18	GPIO0	General Purpose Input Output Pin 0
19	GPIO4	General Purpose Input Output Pin 4
20	GPIO5	General Purpose Input Output Pin 5
21	RXD0	UART0 RXD Pin
22	TXD0	UART0 TXD Pin

Features and Electrical Characteristics

Wireless Standard: IEEE 802.11 b/g/n protocol
Power Transmission:

802.11b	+16 ± 2 dBm
802.11g	+14 ± 2 dBm
802.11n	+13 ± 2 dBm

Frequency Range: 2.412 - 2.484 GHz

Serial Transmission: 110 - 921600 bps, TCP Client 5
SDIO 2.0, SPI and UART Interface available
PWM available
One ADC channel available
Programmable GPIO available
Wireless Network Type: STA / AP / STA + AP
Security Type: WEP / WPA-PSK / WPA2-PSK
Encryption Type: WEP64 / WEP128 / TKIP / AES
Network Protocol: IPv4, TCP / UDP / FTP / HTTP
Operating Voltage: 3.3V
Maximum current allowed to draw per pin: 15mA
Power down leakage current of < 10uA
Integrated low power 32-bit MCU
Onboard PCB Antenna
Wake up and transmit packets in < 2ms
Standby power consumption of < 1.0mW
Operating Temperature: -40ºC to +125 ºC

Overview of ESP-12E

ESP-12E is a member of ‘ESP-XX’ series. Although all of them are based onESP8266SoC they differ in on output pins, flash memory and antenna type. These modules numbered fromESP-01 to ESP-15and are best in performance and cost. Many engineers use these modules to setup a wireless communication between two applications. For data sharing and IoT you will find these modules Ideal.

How to use the ESP-12E

This module does not have complex circuitry or programming so using this module is very easy. We will construct a simple application circuit for understanding the module working.

Steps for setting up a simple application circuit:

Connect positive +3.3V power to the module.
Interface module to a microcontroller orARDUINOusing UART (Connect RXD of ESP to RXD of µC & TXD of ESP to TXD of µC).
Download the libraries for the module from the internet. For ARDUINO, the IDE will have pre-installed libraries. If you do not have them just update the libraries from ARDUINO website.
Write the program for setting up the baud rate and data exchange.
Send data to the module for transmitting through Wi-Fi or Receive data from the module that was transmitted via Wi-Fi.
There is another way for setting up the module which is to bypass microcontroller and directly connect the module to PC using FTDI. After interface you can use serial monitor to communicate with the module.