Ebay ESP8266 pinout - model ESP-01

This particular ESP8266 was bought off Ebay from China. Ebay has all kinds of ESP8266 models. My version is ESP-01, it was bought in 2014 and it looks like this.

ESP8266 board connections:

• 3.3V power supply
• GPIO0 and GPIO2 are 2 general purpose input/output pins. GPIO0 will be set to GND only when loading the firmware
• CH_PD must be in pullup mode when programming only
• RST in pullup mode

Warning! ESP8266 does not support 5V on either of its pins.

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References: The image was taken from www.electroschematics.com and the information from www.whatimade.today