Blynk App The doll is controlled using a Blynk web app. Blynk is an IoT platform free for prototyping/non-commercial use. The Halloween Doll Blynk app Begin by downloading Blynk from the Android Play or Apple App Store. Create an account and Scan the QR-code above from within the app Under the project settings locate the projects Auth Token by emailing to your account or using the Copy all feature Copy the auth token to the android sketch, upload and you should be good to go!