Send data from the Arduino via a HC-05

Projects Programming
1

Sup guys,

I have a project where I want to measure the time an object needs to fall from a given height. That part is already done by adding a display to my Arduino UNO and giving out the measurments this way. But now I want to view my measurnents by sending them to my smartphone via the HC-05. This is what I already managed to do:

Arduino Sketch:

#include <LiquidCrystal.h>
#include <SoftwareSerial.h>  

#define rxPin 10
#define txPin 11

LiquidCrystal lcd(8, 9, 4, 5, 6, 7);   

SoftwareSerial btSerial(rxPin, txPin);
String btData;

int adc_key_in  = 0;
int zeit;
int Z=0;

void setup(){
  pinMode(13, INPUT); digitalWrite(13, HIGH);  // PullUp --> Eingang wird auf HIGH gesetzt
  pinMode(12, INPUT); digitalWrite(12, HIGH);  // 12-Kugel, 13-Pfanne
  lcd.begin(16, 2);
  btSerial.begin(9600);
  btSerial.println("bluetooth available");
  pinMode(ledPin,OUTPUT); 
}

void loop(){
  switch (Z) {
    case 0:          // Aufbau-Info 
      lcd.clear();
      lcd.setCursor(0,0); lcd.print("Kugel einhaengen"); 
      lcd.setCursor(0,1); lcd.print("Pfanne anheben");
      delay(4000);
      Z=1;
    break;
    case 1:          // Aufbau-Test  
      lcd.clear();
      lcd.setCursor(0,0); lcd.print("Kugel   Pfanne"); 
      lcd.setCursor(0,1); lcd.print("Select: weiter");
      while (read_LCD_buttons()!=4){
        lcd.setCursor(6,0); 
        if (digitalRead(12)==LOW) lcd.print("+");
        else lcd.print("-");
        lcd.setCursor(15,0); 
        if (digitalRead(13)==HIGH) lcd.print("+");
        else lcd.print("-");
      }
      Z=2;
    break;
    case 2:          // Aufbau-Info 
      lcd.clear();
      lcd.setCursor(0,0); lcd.print("Messung starten!");
      while (digitalRead(12)==LOW){};
      zeit=millis();
      while (digitalRead(13)==HIGH){};
      zeit=millis()-zeit;
      Z=3;
    break;
    case 3:
      lcd.clear();
      lcd.setCursor(0,0); lcd.print("Zeit (ms): ");
      lcd.setCursor(11,0); lcd.print(zeit);
      lcd.setCursor(0,1); lcd.print("Reset ?");
      Z=4;
    break;
    case 4:
    break;
  }
}

int read_LCD_buttons() {                  // liest den analogen Eingang 0 und 
 adc_key_in = analogRead(0);              // und gibt eine Ganzzahl zurück  
 if (adc_key_in > 1000) return 5;         // btnNONE
 if (adc_key_in < 50)   return 0;         // btnRIGHT
 if (adc_key_in < 250)  return 1;         // btnRIGHT
 if (adc_key_in < 450)  return 2;         // btnDOWN
 if (adc_key_in < 650)  return 3;         // btnLEFT
 if (adc_key_in < 850)  return 4;         // btnSELECT
 return 5;                                // when all others fail, return this...
}

MIT App Inventor2:
in attachment

My problem now is that I dont know how I can read out the time (in ms) and send it to the Smartphone. Dou you have any advise for me?

With best regards
playzocker22

(I am from Germany, if you have any language questions regarding the sketch just ask)

Unbenannt.PNG
Unbenannt.PNG1112×662 57.2 KB

2

You problem is not clear but you should be able to send the data to the phone essentially just like you send it to LCD, which I understand is OK. Using the method below, you can send the data to serial monitor to prove it. Once that is OK, connect bluetooth and try sending data to phone. Use Bluetooth Terminal, not app inventor.

Note that bluetooth must be disconnected to upload the programme to Arduino.

#include <LiquidCrystal.h>
LiquidCrystal lcd(8, 9, 4, 5, 6, 7);   

int adc_key_in  = 0;
int zeit;
int Z=0;

void setup(){
  pinMode(13, INPUT); digitalWrite(13, HIGH);  // PullUp --> Eingang wird auf HIGH gesetzt
  pinMode(12, INPUT); digitalWrite(12, HIGH);  // 12-Kugel, 13-Pfanne
  lcd.begin(16, 2);
  Serial.begin(9600);
  pinMode(ledPin,OUTPUT);
}

void loop(){
  switch (Z) {
    case 0:          // Aufbau-Info
      lcd.clear();
      lcd.setCursor(0,0); lcd.print("Kugel einhaengen");
      lcd.setCursor(0,1); lcd.print("Pfanne anheben");
     Serial.println("Kugel einhaengen    Pfanne anheben");
      delay(4000);
      Z=1;
    break;
    case 1:          // Aufbau-Test 
      lcd.clear();
      lcd.setCursor(0,0); lcd.print("Kugel   Pfanne");
      lcd.setCursor(0,1); lcd.print("Select: weiter");
      Serial.print("Kugel   Pfanne     Select: weiter");

      while (read_LCD_buttons()!=4){
        lcd.setCursor(6,0)
       tralalala..........