OTTO

An Android app for controlling OTTO, a robot by ROBBO via Bluetooth.

Screenshots

Control panel	LED color picker

Sound picker	Dot display

Built With

• Kotlin
• AndroidX libraries:
  • Navigation component
  • Lifecycle (LiveData, ViewModel)
• ColorPicker

Communicating to the robot

To define what data will be sent to the robot, edit data/Action.kt. Action class defines how the actions received from the user would be converted into bytes to be sent to the robot. The following example shows how the text may be converted into a byte sequence.

class ShowText(private val text: String) : Action() {
    override fun toBytes(): ByteArray {
        val header: Byte = 0b01011010
        return byteArrayOf(header) + text.toByteArray()
    }
}

Getting data back from the robot

In order to get data back to the robot, you have to subscribe to viewmodel/ViewModels.kt ByteArray Observable (or any data class you define, check it out for more info). ViewModels object receives updates from the model and passes them to all its observers. (viewmodel/ViewModels.kt probably will be moved to the data/Repository.kt or something like that in later releases, so be careful.)

There is the example of getting data with the ViewModel at examples/ViewModelWithRobotCallback.kt

Creating your own control panel

After creating your own control panel and linking it with the ViewModel, you should define your own Action subclasses to represent actions your panel allows performing. Then call ActionRepository.sendAction(Action) from your ViewModel. See examples in view/options/text/TextFragment.kt and view/options/text/TextViewModel.kt or view/controlpanel/OttoControllerFragment.kt and view/controlpanel/OttoControllerViewModel.kt.