Protocol decoder:Esp8266

Modules

Various online marketplaces sell modules containing the ESP8266 (and a few assisting components) that comes preprogrammed with a TCP/IP stack that can be controlled via RS232 commands.

• ESP-01

Connector: 2x4pin male 2.54mm header

Connector pinout Function Pin Pin Function U0TXD 1 2 GND CHIP_EN 3 4 GPIO2 EXT_RSTB 5 6 GPIO0 VCC 7 8 U0RXD (Note: The PCB has two square pads at the pin header, so it's not clear which one should be pin number 1. The table above assumes that the module is oriented as shown in the picture from the top, with the antenna on the right side, pin 1 is then in the top left corner and pin 8 next to the SPI flash chip.)

ESP-01, top GigaDevice GD25Q40B 4Mbit SPI flash

• ESP-04

Connectors: 7 pin castellated holes on both sides (2mm distance)

Pinout of left connector Pin Function 1 VCC 2 MTMS 3 MTDI 4 MTCK 5 MTDO 6 GPIO2 7 GPIO0

Pinout of right connector Pin Function 1 LNA 2 CHIP_EN 3 XPD_DCDC 4 U0RXD 5 U0TXD 6 n.c. 7 GND

• ESP-05

Connectors: 1x5pin pads (2.54mm distance), U.FL antenna connector

Connector pinout Pin Function 1 EXT_RSTB 2 GND 3 U0RXD 4 U0TXD 5 VCC