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GPIO06 to GPIO11 are connected to the integrated SPI flash on the ESP32-WROVER chip and are not
recommended for other uses.
Input Only Pins
GPIO34-39 can only be set as input mode and do not have software pullup or pulldown functions.
PSRAM Pins
GPIO16 and 17 are used for the RAK11200 Pseudo static RAM (PSRAM).
ESP32 Basic Over The Air (OTA)
OTA stands for Over-The-Air. This feature allows uploading a new program to RAK11200 using WiFi instead of
requiring the user to connect the RAK11200 to a computer via USB to perform the update. See the detailed
instructions on the link below.
ESP32 Basic OTA in Arduino IDE
If you already installed the RAKwireless ESP32, then the BasicOTA sketch has also been installed.
1. Open the Arduino IDE -> File -> Examples-> ArduinoOTA-> BasicOTA.
Figure 12: Arduino OTA Sketch
2. Modify the following two variables with your network credentials, so that RAK11200 can establish a WiFi
connection with the existing network. Then save and upload the BasicOTA sketch.
3. Now, upload a new sketch using over the air port.
4. Copy the blink LED sketch below to your Arduino IDE.
const
char
*
ssid
=
".........."
;
const
char
*
password
=
".........."
;