It establishes a two way communication between the ESP8266 and the device that is connected to it via Wi-Fi. In AP the Wi-Fi module acts as a Wi-Fi network, or access point (hence the name), allowing other devices to connect to it. Make sure the NL and CR option is set.ĮSP8266 module has threeoperational modes. If you see garbage value on the screen, try resetting the module, or checking your baud rate.
#Esp8266 firmware programming serial
Open the serial monitor change the boud rate to 115200 and coose NL and CR ( new line and carrage return ).Type AT on the serial monitor you will see an OK response. Keep it on high (3.3V) for normal operation. Rx: Goes to Arduino pin0 (But needs a voltage adjusting).
In our case (normal operation), it shall be connected to 3.3V (high). GPIO0 also controls the module mode (programming or normal operation).