We using App Invertor for build apk. this apk can control your microcontroller / arduino, using bluetooth and your phone. in this tutorial just sharing how to build apk. next how to programing arduino and make robot.
Step 1: Frist Step
Open new Project in APP Inventor
Step 2: List Picker
Step two, Build list picker for choose to connect bluetooth, just drop and drag from user interface like pic. 2.1
Step 3: Add Label.
Add label for status connected or not
Step 4: Add Table Arrangment
this tabel used for botton
Step 5: Button
Add button for forward, bacward, left, right and Stop.
Step 6: Add Label
add label Text for the current active button
Step 7: Insert Picture
in this step i insert logo UMB.
Step 8: Insert Bluetooth Client & Clock
Bluetooth client used for acces bluetooth in handphone.
Step 9: Programing
in this step we will program how to show bluetooth exsisting and conneted.
Step 10: Status Connected
in this step we used timer for status bluetooth connection
Step 11: Forward
we send "Forward" for command forward
Step 12: Completed Your Code
the last step completed your code like as picture
Step 13: The Finally
and you can save your app program in your computer or your HP using internet.