MIT App Inventor and Arduino Part 2 - send data from Arduino to Android and display

RE: MIT App Inventor and Arduino Part 2 - send data from Arduino to Android and display

t-lesh — Fri, 13 Oct 2017 08:24:31 GMT

Hi Neil

I am new to programming and I have managed to write a program using a couple of sensors for hydroponics project which is due shortly. I have decided to add the HC-06 Bluetooth module to the project so to get the sensor values on my android device.

The code goes as follows

//Including Libraries

#include <dht.h>7

#include <LiquidCrystal.h>

//Assigning pins for LCD

LiquidCrystal lcd(12, 11, 5, 4, 3, 2);

dht DHT;

//Assigning pins for Temp&Humid sensor

#define DHT11_PIN 7

//Assigning pins on the Arduino

const int fan = 9;

const int led =13;

int sensorPin = A0; // select the input pin for LDR

int sensorValue =500 ; // variable to store the value coming from the sensor

void setup(){

lcd.begin(16, 2); // defining LCD Characters

Serial.begin(9600); //communication speed

// making pins as INPUT & OUTPUTS

pinMode(9, OUTPUT);

pinMode(A0, INPUT);

pinMode(led, OUTPUT);

}

void loop()

{

// LOOP For Temp & Humid

while(1){

DHT.read11(DHT11_PIN);

int chk =DHT.temperature;

lcd.setCursor(0,0);

lcd.print("Temp: ");

lcd.print(DHT.temperature);

lcd.print((char)223);

lcd.print("C");

lcd.setCursor(0,1);

lcd.print("Humi: ");

lcd.print(DHT.humidity);

lcd.print("%");

if ( chk>=26){

digitalWrite(fan,1);

delay(100);

}

if(chk<26)

{

digitalWrite(fan, 0);

delay(100);

}

delay(1000);

//Loop for the LDR and PULP

sensorValue = analogRead(sensorPin); // read the value from the sensor

Serial.println(sensorValue); //prints the values coming from the sensor on the screen

if(sensorValue<800){

digitalWrite(led,true);

delay(50);

}else

{digitalWrite(led,false);

delay(50);}

//digitalWrite(13,1);

delay(50);

}

It will be much apprecated if you could help me interface the readings of the vakues with my bluetooth module.

Thanks Neil

RE: MIT App Inventor and Arduino Part 2 - send data from Arduino to Android and display

tonkog777 — Fri, 05 May 2017 08:15:10 GMT

Hi [mention:b7ba740b35ec45dc933b4e03cf0b9008:e9ed411860ed4f2ba0265705b8793d05]

I have a problem. I want to receive message by Arduino, and send message to my android phone, and display it. but I dont know how to do it. Would you teach me how to do it, please. Thank you [mention:b7ba740b35ec45dc933b4e03cf0b9008:e9ed411860ed4f2ba0265705b8793d05].

ps: I want to use arduino UNO, CNY 70, HC-05, VC0706, SD card to achieve Use Eyes To Control Shooting Function. Would you tell me how to achieve it. Thank you !!!!

RE: MIT App Inventor and Arduino Part 2 - send data from Arduino to Android and display

fabijes — Wed, 08 Mar 2017 05:15:57 GMT

good day neil please i need your help i try send data from accelerometer with bluetooth to a android app can you help with it?? i new with this things pleasee help me i have trying your code only in the monitor serial and its work perfect but i have to probe it with other app designed

RE: MIT App Inventor and Arduino Part 2 - send data from Arduino to Android and display

Former Member — Fri, 23 Oct 2015 13:11:02 GMT

Sir Neil .... I need help i cant separate the data for humidity and temperature. I want my label3 = Hdata and label4=Tdata [View:/resized-image/__size/16x16/__key/commentfiles/f7d226abd59f475c9d224a79e3f0ec07-7844a363-49d8-4a46-ad09-9f16676034a2/0552.contentimage_5F00_2.png:16:16] when i run this code humidity and temperature data will display in label3 only [View:/resized-image/__size/16x16/__key/commentfiles/f7d226abd59f475c9d224a79e3f0ec07-7844a363-49d8-4a46-ad09-9f16676034a2/0552.contentimage_5F00_2.png:16:16]

[View:/resized-image/__size/454x678/__key/commentfiles/f7d226abd59f475c9d224a79e3f0ec07-7844a363-49d8-4a46-ad09-9f16676034a2/0724.contentimage_5F00_179644.jpg:454:678][View:/resized-image/__size/620x330/__key/commentfiles/f7d226abd59f475c9d224a79e3f0ec07-7844a363-49d8-4a46-ad09-9f16676034a2/3056.contentimage_5F00_179645.jpg:620:330]

#include "DHT.h"

#include <SoftwareSerial.h>

#define DHTPIN 26 // what pin we're connected to

#define DHTTYPE DHT11 // DHT 11

DHT dht(DHTPIN, DHTTYPE); //means dht(26,DHT11)

SoftwareSerial mySerial(10, 11); //means mySerial(Rx,Tx)

int led = 8;

int tempmax = 31;

int tempmin = 30;

void setup()

{

Serial.begin(9600);

mySerial.begin(9600);

Serial.println("DHTxx test!");

pinMode(led, OUTPUT);

dht.begin();

}

void loop()

{

// Reading temperature or humidity takes about 250 milliseconds!

// Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor)

float h = dht.readHumidity();

float t = dht.readTemperature();

// check if returns are valid, if they are NaN (not a number) then something went wrong!

if (isnan(t) || isnan(h))

{

Serial.println("Failed to read");

}

else

{

//Serial Monitor is available

if (!Serial.available())

{

Serial.print("Humidity: ");

Serial.print(h);

Serial.print(" %\t");

Serial.print("Temperature: ");

Serial.print(t);

Serial.println(" *C");

}

//Bluetooth Connected to android

if (!mySerial.available())

{

mySerial.println(String(h));

delay(2000);

mySerial.println(String(t));

delay(2000);

}

// condition for maximum temperature and to ON cooling fan

if (t == tempmax )

{

digitalWrite(led, HIGH);

delay(1000);

}

// contition for minimum temperature and to OFF cooling fan

if (t == tempmin)

{

digitalWrite(led, LOW);

delay(1000);

}

RE: MIT App Inventor and Arduino Part 2 - send data from Arduino to Android and display

Former Member — Sat, 11 Jul 2015 04:49:34 GMT

can i connect my arduino to android via my own app ( project)__ flood alert

1. app must be downloaded from play store

2. send and receive data must use internet

3. target 200 persons

4. app for read water level in app connected to internet.

5. app can trigger alarm if safety water level is exceeded.

looks more like this....

pls help me... tq[View:/resized-image/__size/620x349/__key/commentfiles/f7d226abd59f475c9d224a79e3f0ec07-7844a363-49d8-4a46-ad09-9f16676034a2/5543.contentimage_5F00_179643.jpg:620:349]

RE: MIT App Inventor and Arduino Part 2 - send data from Arduino to Android and display

Former Member — Tue, 12 May 2015 13:32:26 GMT

[View:/resized-image/__size/251x471/__key/commentfiles/f7d226abd59f475c9d224a79e3f0ec07-7844a363-49d8-4a46-ad09-9f16676034a2/contentimage_5F00_179642.jpg:251:471]

neil i can solved my problem, i'm adding Serial3.print(" "); in my arduino program and use your arduino system

thanks for that

neil i have new problem, to print the string i must click button twice, after that string printed in my aplication

can you help me, to make print string just once click? using the system above

RE: MIT App Inventor and Arduino Part 2 - send data from Arduino to Android and display

Former Member — Tue, 12 May 2015 03:10:02 GMT

neil, i'm try your system
it's same output in application, like my figur3,

im try write "abcd"
the difference is i'm first click application print "a" and second click application print "bcd"

RE: MIT App Inventor and Arduino Part 2 - send data from Arduino to Android and display

Former Member — Mon, 11 May 2015 11:57:59 GMT

Neil, I have problem. . .

figure1

[View:/resized-image/__size/620x598/__key/commentfiles/f7d226abd59f475c9d224a79e3f0ec07-7844a363-49d8-4a46-ad09-9f16676034a2/0456.contentimage_5F00_179637.jpg:620:598]

figure2

[View:/resized-image/__size/471x409/__key/commentfiles/f7d226abd59f475c9d224a79e3f0ec07-7844a363-49d8-4a46-ad09-9f16676034a2/7271.contentimage_5F00_179638.jpg:471:409]

figure3

[View:/resized-image/__size/304x900/__key/commentfiles/f7d226abd59f475c9d224a79e3f0ec07-7844a363-49d8-4a46-ad09-9f16676034a2/2313.contentimage_5F00_179639.jpg:304:900]

figure4

[View:/resized-image/__size/429x396/__key/commentfiles/f7d226abd59f475c9d224a79e3f0ec07-7844a363-49d8-4a46-ad09-9f16676034a2/6170.contentimage_5F00_179640.jpg:429:396]

i'm make application like figure 1 and 2

after i try the application serial monitor print string "abcd" like figure4, but my android application in first time print "a" and in second time print "bcd" like figure3
can you help me to solve my problem? i need aplication can print "abcd" like in serial monitor

*i use serial3 because, i use 2 communicatiion serial to make some device

if i can't solve this problem i can't continue my device

RE: MIT App Inventor and Arduino Part 2 - send data from Arduino to Android and display

neilk — Mon, 04 May 2015 13:58:36 GMT

jatiii Hi taufik

Have you actually got my original Arduino Sketch and Android App working, with 2 data items. before trying to extend it to 4 data items?

Neil

RE: MIT App Inventor and Arduino Part 2 - send data from Arduino to Android and display

Former Member — Mon, 04 May 2015 08:23:45 GMT

Hey everybody...

Could You Do Me a Favour?

I got problem here when I'm trying to make android app using AppInventor2. I'm going to make android app to showed data "TempValue", "MoistureValue", "ldrvalue", and "soilvalue". I'm trying to make it by modified your project namely "Data_From_Arduino_2A" and "Receive_Data_2_Pot" , but none of them working.

Help me please.

Regards

- Jati -

[View:/resized-image/__size/620x323/__key/commentfiles/f7d226abd59f475c9d224a79e3f0ec07-7844a363-49d8-4a46-ad09-9f16676034a2/7178.contentimage_5F00_179633.jpg:620:323]

I used HC-05

[View:/resized-image/__size/620x625/__key/commentfiles/f7d226abd59f475c9d224a79e3f0ec07-7844a363-49d8-4a46-ad09-9f16676034a2/5025.contentimage_5F00_179634.png:620:625]

This is my arduino code. I'm going to make android app to showed data "TempValue", "MoistureValue", "ldrvalue", and "soilvalue".

[View:/resized-image/__size/620x363/__key/commentfiles/f7d226abd59f475c9d224a79e3f0ec07-7844a363-49d8-4a46-ad09-9f16676034a2/8244.contentimage_5F00_179635.png:620:363]

I modified from "Data_From_Arduino_2A" and I add more 2 sensor's data.

[View:/resized-image/__size/620x363/__key/commentfiles/f7d226abd59f475c9d224a79e3f0ec07-7844a363-49d8-4a46-ad09-9f16676034a2/2476.contentimage_5F00_179636.png:620:363]

And this one I modified from "Receive_Data_2_Pot" but none if them showed data. Please help me. Thanks.

Regards - JATI.

RE: MIT App Inventor and Arduino Part 2 - send data from Arduino to Android and display

neilk — Sun, 01 Mar 2015 17:46:34 GMT

Hi summi Thanks for posting your very sophisticated solution to "your problem".

I say "your problem", because I don't have the same exact problem! However, a few points:

You picked up a very important issue which I had overlooked - the Arduino print and Android read were both set to 1 second - hence a significant potential for corruption in the Android read buffer. Reducing the Android timer interval to less than the delay in the Arduino should, on it's own solve ALL the problems!!
When I offered my test for "is a number" You said: "That sadly didn't fix it, because the sended data's characters are only numbers so nothing happend" .
Actually if the buffer contains 2 writes, then there will be CR/LF between them & this will mean that the total character string is NOT a number, so that actually fixed MY very rare problem.
In your post of 26 Feb, with screen shots, the bottom sub window of the IDE shot has some orange text which I can't read. This usually means that there has been an error in compiling the sketch or in uploading it - any comments?
Finally - your use of the split text function in AppInventor is very good - thanks, I wondered how to use it and pick up the results from a list!

Overall, I am concerned that you have had to resort to a very sophisticated solution to what should be a trivial problem. It makes me wonder if there is a deeper problem, either with your Arduino or with your HC-06, which is now being masked by your solution - as I have said before - I don't see the same problem as you.

Best wishes

Neil

RE: MIT App Inventor and Arduino Part 2 - send data from Arduino to Android and display

neilk — Thu, 26 Feb 2015 14:29:16 GMT

summi Ok what's happening here is that the Android read and the Arduino send are overlapping so that the Android read buffer is corrupted. This happens very very rarely on my Android devices - can't explain why it's so frequent on yours.

The only solution I can think of is to test the data read from Bluetooth and makes sure it's a number. I've had this running for a long time with no problems

Here is the modified code block which does that: I will attach a copy of the modified .aia file to the original post.

[View:/resized-image/__size/822x215/__key/commentfiles/f7d226abd59f475c9d224a79e3f0ec07-7844a363-49d8-4a46-ad09-9f16676034a2/6177.contentimage_5F00_179631.jpg:822:215]

I hope this fixes your problem

Neil

RE: MIT App Inventor and Arduino Part 2 - send data from Arduino to Android and display

Former Member — Wed, 25 Feb 2015 04:22:18 GMT

Hey,

can you just send me your app because I am not getting the desired results,Thanks.

RE: MIT App Inventor and Arduino Part 2 - send data from Arduino to Android and display

Former Member — Tue, 27 Jan 2015 07:08:22 GMT

I found that the following youtube video was very helpful:

https://www.youtube.com/watch?v=DkGGilznfG8

RE: MIT App Inventor and Arduino Part 2 - send data from Arduino to Android and display

Former Member — Tue, 27 Jan 2015 06:43:01 GMT

[View:/resized-image/__size/620x349/__key/commentfiles/f7d226abd59f475c9d224a79e3f0ec07-7844a363-49d8-4a46-ad09-9f16676034a2/6470.contentimage_5F00_179628.jpg:620:349]

How to display the output in different labels?