Principios da comunicação entre Android e Arduino

1. Comunicação Android <=> Arduino

8. Comunicação serial UART/USART
void setup() {
Serial.begin(9600);
while (!Serial) {}
pinMode(2, INPUT);
establishContact();
}
void loop() {
if (Serial.available() > 0) {
firstSensor = analogRead(A0) / 4;
secondSensor = analogRead(1) / 4;
thirdSensor = map(digitalRead(2), 0, 1, 0, 255);
Serial.write(firstSensor);
Serial.write(secondSensor);
Serial.write(thirdSensor);
}
}
void establishContact() {
while (Serial.available() <= 0) {
Serial.print('A');
delay(300);
}
}
int firstSensor = 0;
int secondSensor = 0;
int thirdSensor = 0;

9. Serial.print();
ou
Serial.write();?
?

10. Serial.print();
Serial.print(2015);
“2"
“0"
“1"
“5"

11. Serial.write();
Serial.write(2015);
2015
0x07DF
00000111 11011111

12. Bluetooth

13. WiFi

14. USB

15. NFC

17. +

18. Com grandes poderes vem grandes
responsabilidades

19. Velocidade
Integridade
Segurança

20. Fale só o necessário!

21. String sensor_a = “A:” + digitalRead(5);
String sensor_b = “B:” + digitalRead(6);
String sensor_c = “C:” + digitalRead(7);
String sensor_d = “D:” + digitalRead(8);
String sensor_e = “E:” + digitalRead(9);
String sensor_f = “F:” + digitalRead(10);
Serial.println(sensor_a);
Serial.println(sensor_b);
Serial.println(sensor_c);
Serial.println(sensor_d);
Serial.println(sensor_e);
Serial.println(sensor_f);
A:1
B:0
C:1
D:1
E:0
D:1
24 bytes

22. int sensors [] = {
digitalRead(5),
digitalRead(6),
digitalRead(7),
digitalRead(8),
digitalRead(9),
digitalRead(10)
};
char states = 0x00;
for(int i = 0; i < sizeof(sensors )/sizeof(byte); i++) {
states = states | (sensors[i] << i);
}
Serial.write(states);
00101101
1 byte

23. Verifique suas coisas ao sair e ao chegar!

24. Checksum
I received: 2
I received: 51
I received: 67
I received: 48
I received: 48
I received: 67
I received: 69
I received: 55
I received: 53
I received: 52
I received: 67
I received: 67
I received: 66
I received: 3
2 51 67 48 48 67 69 55 53 52 67 67 66 3
2 51 67 48 48 67 69 55 53 52 67 67 66 3
51 67 48 48 67 69 55 53 52 67 67 66
51 67 48 48 67 69 55 53 52 67 67 66
3 C 0 0 C E 7 5 4 C C B
3C 00 CE 75 4C CB
3C ^ 00 ^ CE ^ 75 ^ 4C == CB

25. https://github.com/tzikis/ArduinoMD5/
http://excamera.com/sphinx/article-crc.html
https://github.com/vinmenn/Crc16
Checksum
MD5
CRC-16
CRC-32

26. < uses-perm ission android:nam e= "android.perm ission.BLUETO O TH" />
< uses-perm ission android:nam e= "android.perm ission.BLUETO O TH_AD M IN" />
< uses-feature android:nam e= "android.hardw are.usb.accessory" />
< uses-perm ission android:nam e= "android.perm ission.ACCESS_W IFI_STATE" />
< uses-perm ission android:nam e= "android.perm ission.CHANG E_W IFI_STATE" />
< uses-perm ission android:nam e= "android.perm ission.CHANG E_NETW O RK_STATE" />
< uses-perm ission android:nam e= "android.perm ission.INTERNET" />
< uses-perm ission android:nam e= "android.perm ission.ACCESS_NETW O RK_STATE" />
Permissões AndroidManifest.xml
Bluetooth
USB
WiFi
< uses-feature android:nam e= "android.hardw are.nfc" android:required= "true" />
< uses-perm ission android:nam e= "android.perm ission.NFC" />
NFC

27. Preparando...
private final InputStream mmInStream;
private final OutputStream mmOutStream;
InputStream tmpIn = null;
OutputStream tmpOut = null;
try {
tmpIn = socket.getInputStream();
tmpOut = socket.getOutputStream();
} catch (IOException e) { }
mmInStream = tmpIn;
mmOutStream = tmpOut;

28. public String read() {
byte[] bytes = new byte[1024];
StringBuilder x = new StringBuilder();
int numRead = 0;
while ((numRead = mmInStream.read(bytes)) >= 0) {
x.append(new String(bytes, 0, numRead));
}
}
Lendo dados...

29. public void write(byte[] bytes) {
try {
mmOutStream.write(bytes);
} catch (IOException e) { }
}
Enviando dados...

30. ?????????????????????
?????????????????????
?????????????????????
?????????????????????
?????????????????????