Bluetooth HC-06. Arduino. Send. Receive. Send text file. Multitouch. Image

[Juan_Antonio]

33.- Two Screens. Screen1 to Connect. Screen2 to view data.

p9A02_bluetooth_dospantallas.aia (5.5 KB)

For the app to work it must be installed.

• We can go from one screen to another without losing the connection.

// Juan A. Villalpando
// http://kio4.com/appinventor/9A02_Bluetooth_Dos_pantallas.htm

#include <SoftwareSerial.h>
SoftwareSerial BT(2,3);

int number = 0;
String numberS = "0";
char caracter = '0';

void setup(){
 BT.begin(9600);
 Serial.begin(9600);
}
 
void loop(){
  // Send number every 800 ms.
  delay(800);
  number = number + 1;
  if(number == 1000){number = 0;}
  Serial.println(number);
  numberS = (String) number + '\n';
  BT.write(numberS.c_str());

  // If receive char 'r' by BT, restart number.    
  if(BT.available()) {
    caracter = BT.read();
    Serial.println(caracter);
    if(caracter == 'r'){number = 0;}
    }
}

• Sketch sends a number by BT every 800 ms: 1 2 3 4 5 6 7 8...
• If this code receives the character 'r' by BT, the count is reset (number = 0)

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• Screen1 Select and Connect BT.
• Receives the numbers by BT and store them in a comma separated string in a TinyDB, Always in the ReceiveText tag. 1,2,3,4,5,6,7,8,...
• Shows all data in Label etq_receive.
• Button "Open Screen2" open this screen.
  
  

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• Screen2 shows in Label etq_receive all data of TinyDB, ReceiveText tag.
• TinyDB1 is the same on both screens, since they have the same NameSpace.
• Button: "Send 'r' (by Screen1)", close Screen2 and sends 'r' to Screen1.
• When Screen1 receive 'r', SendText 'r' by BT to Arduino. Arduino reset (number = 0). Return to Screen2.
  
  

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