ESP8266 WiFi UART Serial Module ESP-12 Expand

ESP8266 ESP12 Test Board WiFi Module

Espressif (ESP) Espressif (ESP)



Handy battery powered ESP8266 ESP12 module test board. Includes on board LEDs, RGB LED and light sensor. Can be setup and controlled without programming using the demo android application. 

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Handy battery powered ESP8266 ESP12 module test board. Includes on board LEDs, RGB LED and light sensor. Can be setup and controlled without programming using the demo android application. 

ESP8266 WiFi UART Serial Module ESP-12

With breakout board and battery holder.

This module uses 3x AA batteries (not included) and has a 3.3V regulator onboard. Additionally:  

1x Power indicating blue LED
6x Red LEDs mapped to GPIO pins
1x RGB 5mm LED mapped to GPIO pins
1x CdS photo-resistor mapped to ADC GPIO pin

Additionally, pins on the ESP are broken out to pin headers. 

Android Demo App:

  1. Download the app, power the module and connect to the AI-THINKERxxxxx WiFi Network using password: ai-thinker
  2. Open the app and connect to the device, you can now control the LEDs and read the ADC value
  3. Optional step: Connect the ESP8266 module to your home/work WiFi network using the app. Setup the external IP address to match that given by the router the the ESP. You can now control the device from your network! 

Board review, testing and PC client here:



The ESP8266 is a highly integrated chip designed for the needs of a new connected world and is the go to choice for IOT. It offers a complete and self-contained Wi-Fi networking solution, allowing it to either host the application or to offload all Wi-Fi networking functions from another application processor.

ESP8266 has powerful on-board processing and storage capabilities that allow it to be integrated with the sensors and other application specific devices through its GPIOs with minimal development up-front and minimal loading during runtime. Its high degree of on-chip integration allows for minimal external circuitry, and the entire solution, including front-end module, is designed to occupy minimal PCB area. The ESP8266 supports APSD for VoIP applications and Bluetooth co-existance interfaces, it contains a self-calibrated RF allowing it to work under all operating conditions, and requires no external RF parts.

There is an almost limitless fountain of information available for the ESP8266, all of which has been provided by amazing community support.



  • Standards Certification: FCC / CE / TELEC
  • Wireless standards: 802.11 b / g / n
  • Frequency range: 2.4GHz-2.5GHz (2400M-2483.5M)
  • Data interface: UART / HSPI / I2C / I2S / Ir Remote Contorl GPIO / PWM
  • Operating voltage: 3.0 ~ 3.6V (recommendation 3.3V)
  • Working Current: Average: 80mA
  • Operating temperature: -40 ° ~ 125 °
  • Wi-Fi Direct (P2P), soft-AP
  • Integrated TCP/IP protocol stack
  • Integrated TR switch, balun, LNA, power amplifier and matching network
  • Integrated PLLs, regulators, DCXO and power management units
  • +19.5dBm output power in 802.11b mode
  • Power down leakage current of <10µA
  • Integrated low power 32-bit CPU could be used as application processor
  • SDIO 1.1 / 2.0, SPI, UART
  • STBC, 1×1 MIMO, 2×1 MIMO
  • A-MPDU & A-MSDU aggregation & 0.4ms guard interval
  • Wake up and transmit packets in < 2ms
  • Standby power consumption of < 1.0mW (DTIM3)


What is this ESP8266

  • It's a wireless SoC
  • It has GPIO, I2C, ADC, SPI, PWM and some more
  • It's running at 80MHz
  • 64KBytes of instruction RAM
  • 96KBytes of data RAM
  • 64KBytes boot ROM
  • It has a Winbond W25Q40BVNIG SPI flash
  • It's a RISC architecture
  • The core is a 106micro Diamond Standard core (LX3) made by Tensilica
  • The ESP8266 chip is made by Espressif
  • Modules bearing this chip are made by various manufacturers

Unbelievable amounts of information available at the ESP8266 community forum:

ESP8266 Github Page:

ESP8266 Yellow Board Wiki Page:


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ESP8266 ESP12 Test Board WiFi Module

ESP8266 ESP12 Test Board WiFi Module

Espressif Systems have their headquarters based in Shanghai Zhangjiang High-Tech Park, which is considered to be “China’s Silicon Valley”, where they produce low-power WiFi and Bluetooth SoC’s and IoT hardware and software.

Their vision is to enhance the world by leveraging modern technologies like IoT and wireless communications to manufacture products that are more versatile, adaptable and eco-friendly, with the aim of reducing the amount of waste and pollution that the world produces each year. So far, they have been able to reduce the consumption of electrical components by hundreds of thousands of resistors, capacitors, inductors, baluns, switches and power management chips, while reducing the amount of Printed Circuits Boards, or PCB’s, by more than 50,000 square meters.

Espressif is quickly becoming the leading manufacturer of IoT and wireless components, modules and devices that cut out the need for cabling and unnecessary electronics, which will not only result in a world that is cleaner and more environmentally sustainable, but also more adaptable and capable of moving towards the future of human technologies.