[Extension] Dynamic graph. Shift left graph. Sinusoidal wave. Bluetooth

Juan_Antonio · December 20, 2021, 7:24pm

5.- Screen1 to connect. Screen2 to view data.

p299H_GraficoDinamico_5.aia (12.6 KB)

The application must be installed

Screen1 to select and connect Bluetooth.
Screen2 to view data graphic with an extension.
We can go from one Screen to another without losing the connection.

Screen1.

Screen2.

// Juan A. Villalpando
// http://kio4.com/appinventor/299H_extension_GraficoDinamico.htm

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

String texto = "";

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

  // If receive BT, write.    
  if(BT.available()) {
    Serial.write(BT.read());
    }

  // If Serial Monitor, send data by BT
  if(Serial.available()){
    texto = Serial.readStringUntil('\n');
    texto = texto + '\n';
    BT.write(texto.c_str());}
}

Sketch sends random every 800 ms. by BT.
You can write a number on Serial Monitor and send it by BT.
You can write a text in the app and send it to Arduino by BT (check Serial Monitor).