https://www.electroschematics.com/wp-content/uploads/2015/02/esp8266-datasheet.pdf

https://www.esp8266.com/wiki/doku.php?id=esp8266-module-family

How to Program ESP32 with Arduino IDE? https://www.electronicshub.org/esp32-arduino-ide/

Description The ESP8266 WiFi Module is a self contained SOC with integrated TCP/IP protocol stack that can give any microcontroller access to your WiFi network. The ESP8266 is capable of either hosting an application or offloading all Wi-Fi networking functions from another application processor. Each ESP8266 module comes pre-programmed with an AT command set firmware, meaning, you can simply hook this up to your Arduino device and get about as much WiFi-ability as a WiFi Shield offers (and that’s just out of the box)! The ESP8266 module is an extremely cost effective board with a huge, and ever growing, community.

Modules

Most common modules ESP-NN seem to come from AI-Thinkers vendor. Espressif Systems themselves have produced the ESP-WROOM-02 Wi-Fi Module.

All Modules by AI-Thinker : see http://wiki.ai-thinker.com/_media/esp8266/esp8266_module_list.png

推荐型号 (Green) : Recommended Model 停产型号 (Gray) : Discontinued Model Product Specification : http://wiki.ai-thinker.com/esp8266/docs

User Manual : http://wiki.ai-thinker.com/_media/esp8266/a000um01a3.pdf

There are also modules from other vendors, such as :

Olimex, see https://www.olimex.com/Products/IoT/, Wireless-tag, see http://www.wireless-tag.com/index.php/Product/dis/33.html Qilianer, see http://en.qilianer.com/product/28032.html Smarttime.cn, see http://www.smartline.com.cn/

and other unknown vendors are starting to become available.

Apparently new versions of older modules are appearing with larger flash sizes. To check the flash size of your module:

esptool.py –port /dev/ttyUSB0 –baud 115200 flash_id

Connecting… Manufacturer: c8 Device: 4013 Then check out the combo at https://code.coreboot.org/p/flashrom/source/tree/HEAD/trunk/flashchips.h:

manufacturer c8 is GigaDevice and device 4013 is GD25Q40, which is a 4Mbit=512KByte device manufacturer ef is Winbond (ex Nexcom) and device 4016 is W25Q32, which is a 32Mbit=4MByte device

Note:This is not an EU CE declaration of conformity, This is a test pass certificate from a third party test company that has no official standing. An official EU DoC must be made by the manufacturer not a third party. Also note safety standard EN60950 does not exist, and has not for many many years. The R&TTE directive quoted ceased to be valid in 2016. These comments and similar apply to a lot of the certificates on this page.

Summary Table