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Arduino Beginner Experiments: Reading the DHT11 Data in Smartphone

HELLO THERE!!!

        How are you guys? I hope everyone is fine and in a good mood always. In this post, I would like to share with you guys an experiment which is the continuation of last post experiment. In this experiment, I would like to read the DHT 11 sensor values in my smartphone. So, I would like to share two ways to do so.


HARDWARE:
1.Arduino UNO
2. Bluetooth Module (I used HC-06 )

3. DHT11 Sensor (If you are using LM35 refer here:  http://halim930112.blogspot.my/2016/04/arduino-experiments-lm35-and-graph.html)

4. Smartphone
SOFTWARE:
1. MIT App Inventor 2
2. Bluetooth Terminal (Downloadable from Play Store)


CIRCUIT ASSEMBLY:



 Referring to both of the Images above, the connection is as follows:

HC-06                                    Arduino
--------                                    ----------
RX      ----------------------->  TX
TX      ------------------------> RX
GND  -------------------------> GND
VCC  --------------------------> 5V



DHT11                                    Arduino
---------                                    ----------
S          ------------------------>  Any Digital Pin
Middle Pin --------------------> 5V
-            ------------------------> GND


CODING THE ARDUINO:

We can use the same code used in last post. The code in the last post is here ( http://halim930112.blogspot.my/2016/12/arduino-beginner-experiments-measuring.html )


After writing the code, upload the code to your Arduino. To view the readings of the sensor in your smartphone, there are two ways. The first way (the easiest way) is to download the bluetooth terminal app in the playstore. There are few of those software online ( I am using the Bluetooth Terminal). After downloading the software, we can try to connect the our phone with the Arduino and view the readings. Below are the steps I used to setup my app with Arduino.



This is the main screen (GUI) of the Bluetooth Terminal App. Click on 3 dots on the top right of the app to open a list of drop down menu.

Select the Connect a device- Secure option. Then, a pop up will appear listing all of the connectable bluetooth items
After successful connection, the data from the Arduino will be transmitted to your smartphone






    The second way is to build an android app using the MIT App Inventor 2. This app that I am going to show you will do 2 things:

1. Show the reading of the DHT11 in your phone.
2. Log the readings in a text file

 The MIT App Inventor UI and block codes are as shown below:

The Main Screen (the GUI)

The Block of codes used for this App

After creating the App, install it in your smartphone. If you run the app, the app will automatically log the data received in a text file. Example of the text file is shown below:

Readings from the DHT11





If you want to try out the app, you can download it from here (ai2.appinventor.mit.edu/?galleryId=6198770507972608).Well, that's all from me this week, folks. I hope to see you guys in the next post. Till then, I would like to say HAPPY TINKERING!!!!













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