![Peripherals - matrix keypad
CONTRIB DRIVERS - matrixkeypad
sample
public class BoardDefaults {
private static final String DEVICE_RPI3 = "rpi3";
public static String[] getRowPins() {
return new String[]
{"BCM27", "BCM5", "BCM6", "BCM26"};
}
public static String[] getColPins() {
return new String[] {"BCM16", "BCM24", "BCM23"};
}
}](https://image.slidesharecdn.com/ksssessionandtechtalk-2019oniot-221117163832-8d17f6d0/85/KSS-Session-and-Tech-Talk-2019-on-IOT-pptx-35-320.jpg)
![public class MatrixKeypadActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
mMatrixKeypadDriver = new MatrixKeypadInputDriver(
BoardDefaults.getRowPins(),
BoardDefaults.getColPins(),
new int[] {KeyEvent.KEYCODE_NUMPAD_1, KeyEvent.KEYCODE_NUMPAD_2,
KeyEvent.KEYCODE_NUMPAD_3, KeyEvent.KEYCODE_NUMPAD_4,
KeyEvent.KEYCODE_NUMPAD_5, KeyEvent.KEYCODE_NUMPAD_6,
KeyEvent.KEYCODE_NUMPAD_7, KeyEvent.KEYCODE_NUMPAD_8,
KeyEvent.KEYCODE_NUMPAD_9, KeyEvent.KEYCODE_NUMPAD_MULTIPLY,
KeyEvent.KEYCODE_NUMPAD_0, KeyEvent.KEYCODE_NUMPAD_ENTER});
mMatrixKeypadDriver.register();
}
@Override public boolean onKeyDown(int keyCode, KeyEvent event) { ... }
@Override public boolean onKeyUp(int keyCode, KeyEvent event) { ... }
@Override protected void onDestroy() {
mMatrixKeypadDriver.close();
}
}](https://image.slidesharecdn.com/ksssessionandtechtalk-2019oniot-221117163832-8d17f6d0/85/KSS-Session-and-Tech-Talk-2019-on-IOT-pptx-36-320.jpg)
KSS Session and Tech Talk-2019 on IOT.pptx
- 1. Internet Of Things and Use Cases: Tech Talk Session By: Nashet Ali
- 11. IoT Simple Demo MQTT AWS IoT Write Static S3 Site Read SMS Amazon CloudFront
- 12. Android Things
- 14. Operating System - Customized version of Android OS - announced at Google I/O 2015, codename: Brillo - based on Android 7.0+ (currently 8.0+) - kiosk mode - theoretically supports devices with 64 MB RAM - Bluetooth Low Energy support* - custom Launcher for IoT configuration - Single application mode automatically boots into main application * Feb 2018 - Android Things is still in beta
- 15. Operating System - Customized version of Android OS - light version Google Play Services - no app store - apps installed via ROM updates - drivers for peripheral devices
- 16. Operating System Android Things Thinned down Android OS with a custom launcher and KIOSK mode
- 17. ROM updates - Google generates initial image - Handles update integrity/signing verification - OTA updates - Automatically reverts previous version if update fails
- 18. Operating System * display is entirely optional
- 19. Hardware - SOM architecture - Base board + certified modules - Custom hardware through pins/connectors/serials SOM - System-on-a-chip SiP - System-in-package (stacked SOMs) - Easy certification (CE - EU declaration of conformity)
- 21. Android vs Android Things - There is no Play Store - Users cannot install apps on their own - App updates provided with OTA updates - No system application drawer - No notifications - UI is optional
- 22. Smart home Firebase cloud: fast callbacks All mobile platforms support - iOS/Android/ Android Things
- 23. Preparation - SDCard min. 4 GB - Raspberry PI ver. 3 - AC adapter
- 24. ROM flashing - Prepare custom ROM from Android Things Developer Console
- 25. Development - Android Things is open source (still in preview) link No need to compile custom ROM & custom launcher In most cases we only need to develop application & services However, we can do that by cloning: repo init -u https://android.googlesource.com/platform/manifest -b android-o-iot-preview-5 repo sync
- 26. Development - If no display is available - screen mirroring from Android e.g. Vysor link - No emulator is provided at this stage (preview) - UI can be developed as a regular Android app android:required="false"
- 27. Development - Steep learning curve (easy for a mobile-developer) - Use usual Android UI, libraries & tools - Kotlin / RxJava etc. - Apps developed in Android Studio - Built-in security
- 28. Development - ADB over Wifi Find raspberry ip address:
- 29. Development - Permissions / Wifi - Permissions are granted at app boot (no Android 6.0+ runtime permission support) - Usually you need to restart the device after adding a new permission - After connecting to a WiFi network - AT reconnects that network on boot You need to restart the device if WiFi network is unavailable on device boot (or go to AT launcher)
- 30. Development - GPIO pins private fun turnOnDiodeVoltage() { val peripheralService = PeripheralManagerService() try { val mLedGpio = peripheralService.openGpio("BCM18") mLedGpio?.setDirection(Gpio.DIRECTION_OUT_INITIALLY_LOW) mLedGpio?.value = true } catch (e: IOException) { Log.e("THINGS", "Error on PeripheralIO", e) } }
- 31. Development - Firebase sign-in mAuth = FirebaseAuth.getInstance() mAuth?.signInWithEmailAndPassword( "smart@home.pl", "abchome") ?.addOnCompleteListener( this) { task -> if (task.isSuccessful) { val database = FirebaseDatabase.getInstance() val diodeDBFieldRef = database.getReference( "diode") } else { Log.w( "THINGS", "signInWithEmail:failure" , task.exception) } }
- 32. Development - Firebase events diodeRef.addValueEventListener( object : ValueEventListener { override fun onDataChange (dataSnapshot: DataSnapshot) { val isDiodeTurnedOn = dataSnapshot.getValue(Boolean:: class.java) } override fun onCancelled (error: DatabaseError) { Log.w("THINGS!", "Failed to read value." , error.toException()) } })
- 33. Development
- 34. Peripherals - Buttons - Motors - Display - Keyboards - Matrix keyboards - Diodes - Switches - Other DOM Android Things IoT examples on GitHub - link
- 35. Peripherals - matrix keypad CONTRIB DRIVERS - matrixkeypad sample public class BoardDefaults { private static final String DEVICE_RPI3 = "rpi3"; public static String[] getRowPins() { return new String[] {"BCM27", "BCM5", "BCM6", "BCM26"}; } public static String[] getColPins() { return new String[] {"BCM16", "BCM24", "BCM23"}; } }
- 36. public class MatrixKeypadActivity extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { mMatrixKeypadDriver = new MatrixKeypadInputDriver( BoardDefaults.getRowPins(), BoardDefaults.getColPins(), new int[] {KeyEvent.KEYCODE_NUMPAD_1, KeyEvent.KEYCODE_NUMPAD_2, KeyEvent.KEYCODE_NUMPAD_3, KeyEvent.KEYCODE_NUMPAD_4, KeyEvent.KEYCODE_NUMPAD_5, KeyEvent.KEYCODE_NUMPAD_6, KeyEvent.KEYCODE_NUMPAD_7, KeyEvent.KEYCODE_NUMPAD_8, KeyEvent.KEYCODE_NUMPAD_9, KeyEvent.KEYCODE_NUMPAD_MULTIPLY, KeyEvent.KEYCODE_NUMPAD_0, KeyEvent.KEYCODE_NUMPAD_ENTER}); mMatrixKeypadDriver.register(); } @Override public boolean onKeyDown(int keyCode, KeyEvent event) { ... } @Override public boolean onKeyUp(int keyCode, KeyEvent event) { ... } @Override protected void onDestroy() { mMatrixKeypadDriver.close(); } }
- 37. Drivers - Contrib drivers open source (link) - GPS drivers - Human Input Device (HID) drivers - Sensor drivers - Custom drivers written in C/C++
- 38. UserDriverManager class - Is responsible for registering/unregistering new user devices - Available methods: - registerGpsDriver(GpsDriver) - registerInputDriver(InputDriver) - registerSensorDriver(UserDriver) - unregisterGpsDriver() //without arguments, because there can be only one GPSDriver - unregisterInputDriver(InputDriver) //there can be multiple InputDrivers - unregisterSensorDriver(UserSensor) //there can be multiple UserSensors - Unregister method should be called in onDestroy() method
- 39. How new device registration works?
- 40. How new device registration works?
- 41. GPS drivers - External GPS device connected to an Android Things device through a UART connection - Support for GPS modules which return location data in the NMEA format - NMEA GPRMC (Recomennded Minimum Navigation) structure: $GPRMC, <Time>,<Status>,<Latitude>,<Longitude>,<Speed>,<Angle>,<Date>, <Variation>,<Integrity>,<Checksum> - GPS support is possible with using GpsDriver class, included into Android Things SDK
- 42. GPS drivers
- 43. Human Input Device (HID) drivers - Support for peripherals like buttons, controller joysticks and keyboards - Peripherals can be connected to the board via UART, GPIO, I2C, etc. - InputDriver class allows to tie own human interactions to the standard Android input
- 44. Human Input Device (HID) drivers
- 45. Sensors drivers - Support for multiple types of sensors, like accelerometer, gyroscope, magnetic field, etc. - UserSensorDriver class contains methods for handling low power and sleep mode - Support for custom sensors types which are not already supported in Android (wind speed, water pH levels, motion detection, etc.)
- 46. Sensors drivers
- 47. Sensors drivers
- 48. Sensors drivers - custom device types
- 49. Sensors drivers - unregister device - Each new created sensor should be unregister in onDestroy() method
- 50. Custom C/C++ drivers - The native PIO APIs let you write C/C++ code to control GPIO, PWM, I2C, SPI, UART peripherals - Native drivers can be used in a Java code - The Native PIO API contains the same classes as Standard Android Things API - Android Things application can be write purely in C/C++
- 51. Custom C/C++ drivers - getting started - Firstable, clone the Android Things Native repo (link) - Move cloned files to the native module in your project - Edit CMakeLists.txt file and add the following lines: - Add the following arch to the native module build.gradle
- 52. Custom C/C++ drivers - example
- 53. Custom C/C++ drivers - example
- 54. OpenWeave protocol - standard for device communication - built by Nest/Google - connect devices via QR codes - weave automatically takes care of updates - offline connection between devices & secure cloud connection - C++ core, Local & Cloud API - low adoption level
- 55. Weave protocol - open source: https://github.com/openweave/openweave-core
- 57. Links - Android Things - https://developer.android.com/things, supported hardware - link - Weave protocol - https://developer.android.com/things, nest weave - link, - Developer console - https://developer.android.com/studio, releases (currently preview - 6.1) - Raspberry Pi AT docs - https://developer.android.com/studio - Android Things Native - https://dzone.com/articles/how-to- build-an-android-mobile-application-gradle - Android Things Native examples - https://dzone.com/articles/how-to-build-an-android-mobile- application-gradle
- 58. Next steps 1. Go to console.aws.amazon.com/iot Play with it! 2. Stay up to date with AWS IoT aws.amazon.com/iot-platform/ 3. Start your first IoT project - aws.amazon.com/iot-platform/getting-started 4. Try some IoT examples - github.com/awslabs/aws-iot-examples 5. Get an AWS IoT Button