How to be able to use the D1 Mini in your Arduino IDE? By default, your Arduino IDE will not recognise the D1 mini from the LIGTHBO.LT webshop. But no hurry, it’s very easy to fix this 😉 Prepare your Arduino IDE to recognize a D1 mini board (ESP8266) Open Arduino IDE and go File > Preferences: In the Additional Boards Manager URLs, enter the URL http://arduino.esp8266.com/stable/package_esp8266com_index.json: Press OK. Go now to the Board Manager: Tools > Board > Board Manager. Search in the Board Manager for esp8266 and click on Install: Specific settings needed in Arduino IDE to be able to use the D1 mini (ESP8266) board You can now select the right board in Tools > Boards > ESP8266 Boards > LOLIN(Wemos) D1 R2 & mini. And additonally, change the Upload Speed (Tools > Upload Speed) to match 115200: Your Arduino IDE is now ready to push some code!