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ESP8266 ESP S
In essense, ESP-S is very similar to ESP-F. The only difference is that ESP-F has more 6 solder point in the end than ESP-S. Therefore, in many applications. This Two WiFi modules can be changed each other.
The WiFi module ESP-S is manufactured by using a high-performance chip ESP8266EX. This small chip is encapsulated an enhanced Tensilica’s L106 diamond series 32-bit kennel CPU with a SRAM. Thus, ESP8285 has the complete function Wi-Fi function; it not only can be applied independently, but can be used as a slaver working with other host CPU. When ESP8285 is applied as a slaver, it can start from the onboard Flash. The built-in high-speed buffer is not only benefit to improve the system performance, but optimize the store system. In addition, ESP8285 can be used as Wi-Fi adapter by SPI/SDIO or I2C/UART interface, when it is applied to other MCU design. The ESP-S module supports the standard IEEE802.11 b/g/n/e/i protocol and the complete TCP/IP protocol stack. User can use it to add the WiFi function for the installed devices, and also can be viewed as a independent network controller. Anyway, ESP-S module provides many probabilities with the best price.
The manual for ESP-S can be downloaded from this link .