Creating a Blynk app

You will need a Blynk app to control the robot with a Joystick widget. You can use the Blynk app you built in Chapter 1, Getting Ready and use the same Auth Token for the Arduino UNO sketch.

However, first make sure that the following things are correctly configured in your app:

• The OUTPUT of the joystick should be set to the MERGE mode (Figure 4.6). In the MERGE mode, the joystick sends one message, consisting of an array of values, to the microcontroller hardware so that you can parse the values on the hardware:

Figure 4.6: Setting the OUTPUT to MERGE mode

• MERGE mode can be used with virtual pins only. Use the virtual pin V1. This will allow the joystick widget to write to pin V1 (Figure 4.7):

Figure 4.7: Selecting the virtual pin V1

• ROTATE ON TILT should be ON for the joystick to automatically rotate if you use your smartphone in landscape orientation (Figure 4.8).
• AUTORETURN should be OFF. When it is ON, the joystick handle will return to its center position after you release...