ESP-12 bootloader modes and GPIO state at startup

Since I encountered some initial difficulties in programming the ESP-12 version of the ESP8266 module using the Arduino IDE, let me here summarise some findings based on information from [1,2,3]. The ESP-12 module exposes 11 GPIOs. Three of them are especially relevant, as they determine the bootloader mode at startup or following reset. | GPIO … Continue reading ESP-12 bootloader modes and GPIO state at startup