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ESP8285 ESP 1
The ESP-1 is also based on ESP8285. So, it has the same features as ESP-M1 and ESP-M2. For example, it can bear a much high temperature to 125℃, small size, and completely comaptible with ESP8266. So the programmed ESP8266 code does not change anything, and can be originally used on ESP8285 modules. The pictures for ESP-1 is shown as the followings.
The manual can be download from this link.