microcontroller: extended esp32 usage and troubleshooting

wiki/microcontroller.md

@@ -10,10 +10,27 @@ It features Wi-Fi and [Bluetooth](/wiki/bluetooth.md).
 Some variants of this chip also include LoRa-capability and can be used to communicate via
 [Meshtastic](/wiki/meshtastic.md).
 
+### Usage 
+
+The following sections address various usages and setups of the ESP32.
+
+### Setup in Arduino IDE
+
+For the ESP32 to work correctly in the Arduino IDE some things have to be set up.
+This section addresses the steps to take to use the ESP32 with the Arduino IDE.
+
+Under preferences set the following URL under `Additional boards manager URLs`.
+
+`https://raw.githubusercontent.com/espressif/arduino-esp32/gh-pages/package_esp32_index.json`
+
+Afterwards install the board manager `esp32`.
+
 ### Flash Firmware on the ESP32 
 
 This section especially focusses on the ESP32S3 microcontroller.
+Make sure that the ESP32 is in [programming mode](#programming-mode).
 For other microcontroller of the ESP32-xx family the process should be similar.
+This following guide is written for [Windows](/wiki/windows.md).
 
 - Download [ESP RF Test Tool and Test Guide](https://www.espressif.com/en/support/download/other-tools)
 - Download [Firmware of ESP32S3](https://files.seeedstudio.com/wiki/SeeedStudio-XIAO-ESP32S3/res/XIAO-ESP32S3-firmware-20240814.zip)
@@ -40,3 +57,16 @@ The board now should be in programming mode and it should be possible to upload
 or firmware onto it.
 This section is based on a Reddit
 [comment by cmatkin](https://www.reddit.com/r/esp32/comments/1g8gerg/getting_a_write_timeout_error_on_my_esp32s3/).
+
+### Troubleshooting 
+
+The following sections address various errors that can occur when using the ESP32. 
+
+#### Can Not Access the Microcontroller Under Linux 
+
+Sometimes the rights to access the ESP32 are set wrong.
+To fix this run the following command. 
+
+```sh 
+sudo chmod 777 /dev/ttyACM0
+```