Android studio bluetooth arduino receive data
This article will detail how to make a simple bluetooth application using Android Studio and demo it using an Arduino to toggle an LED and send data back-and-forth.
No prior knowledge of Android development is needed, however it will help to know some basics of Java programming. I will be using an Android phone for testing purposes and not an Android virtual device. The Android app that you develop can be used with any other microcontroller, I only used the Arduino in this example with the HC bluetooth module since they are both cheap and popular.
I'm going to be creating other posts with different microcontrollers that use this same phone app.
Some of the funtionality that I will be using was taken from the offical bluetooth SDK doc. I also derived some ideas from this blog post. I will be making the GUI layout first since it is easier to grasp what we are trying to do via the visual elements. We will be using the LinearLayout Vertical to make our application.
Without a layout manager, your GUI components would arrange themselves differently depending on the screen size of the device. The default layout choice is the RelativeLayout and works by aligning all of the components in relation to the first component placed on the screen or as dictated by you. Notice how a green line indicates its anchor relationship. Moving the default Hello World! Making an app using this RelativeLayout is straightforward and easy, but often causes headaches with larger or smaller screens than the one you are developing on.
Drag the LinearLayout Vertical from the Palette to the component tree. Then drag a checkbox from the Palette to your main activity screen and double-click on it to call it "Toggle LED".
Align it in the middle of the screen. Your Component screen should now look like th. This next portion will be easier to accomplish and convey by just editing the markup XML from the designer. You can view this by clicking on the lower-left hand side of the viewport where it says "Text".In default the Arduino is not equipped with a display to visualize measuring-data, for example from your temperature or your pressure Sensor. If you want to get the data shown you need a PC, printing the data to the console or mounting a display directly to the Arduino.
In this instructable i will show you, how to transfer measured Sensor-data in realtime from your Arduino -Mikrocontroller to your Android-Smartphone via Bluetooth. Did you use this instructable in your classroom? Add a Teacher Note to share how you incorporated it into your lesson. Every message the Arduino wants to send, is first given to the Bluetooth-Module, which sends the message wirelessly. This Arduino-Code is written for Visualizating measurement data from a microcontroller via Bluetooth.
In the Arduino-Code you determine on your own which values you want to send to the Android-Device. Just change these lines and fit in your own values:.
Feel free to do some experiments! Please, let me know, if something is not explained precisely enough!
Question 22 days ago on Step 2. Question 27 days ago on Introduction. Please share android studio code with me ,if you can. Question 3 months ago on Step 2. So in that case, how can we get the data using your app? Question 3 months ago. Is this mandatory to use at least 5 sensors?
I've written code only for one sensor, it's not working. Question 6 months ago.Add the following snippet to your HTML:. Making a simple system to controll a lamp or some other appliance in your house.
The hability to control any appliance around your house using only your smartphone is very interesting. This project consists of using an Arduino, a cheap bluetooth module and a relay to control, for example, a lamp, by connecting it with your smartphone via bluetooth. This project is intended to be simple using the least amount of resources and code, but still including important demonstrations and descriptions of the whole process.
Let's start by setting up our bluetooth module bottom left component in the figure. If you check the back of your bluetooth module it will have a label showing how much voltage it's receiver pin can handle In my case it's 3.
Hence, it has been included 2 resistors that work as a "voltage divider" that go through the orange wire. I used these resistors because it was what I had in my equipment but if you have any other resistors maybe you can find the right set for you using this Formula and that brings the voltage down a bit:.
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Search for Voltage Divider Calculators on Google and it will give you good explanation and quick calculations. As for the Relay, we also supply it with both power and ground Red and Black wires and a signal wire connected to Arduino's pin number 10 that will command the relay when to power ON or OFF our lamp, for example. What I did was to buy a smaller wire and add to it both plug and socket just as it's represented in the photo of the slideshow above.
Now that you have your extension, pull out 1 of the wires extension and cut it, you will end up with 2 wire ends shown in the 2 photos above. But where can you connect these 2 ends to the relay?. This means that, when the relay is at it's normal state no signal sent to the relay there will be a connection between NC and C ports. When a signal is sent a connection will be set between C and NO instead. So that's why we connect our 2 wire ends to both C and NO because we want to send a signal to our relay in order to let the current flow through these two channels and provide energy to our appliance.
It is important to note that all the code above is in the Arduino's point of view, meaning that all the 'reading' operations are operations where the arduino is receiving data from some other source, and the write operations are operations where the arduino is sending messages to other source as well.
The sequence of usage in our system will be like this:. In the first few lines of code, we start by including the SoftwareSerial library that will allow us to communicate with the Bluetooth module. Then we create constants that identifies the pins we wish to use for each of our components, in this case, the Arduino's pin that will controll the RELAY is number 10 and the pin to controll the built-in LIGHT on Arduino's is number Then, the data structure called 'data' of type 'char' acts as a buffer for our incoming messages from the bluetooth module, and some more auxilliary variables for our data structure flag, index, c that will be explained in the Loop section.
The predefined method 'setup', will be the first method to be executed before our actual intended program starts running. It basically allows us to configurate some of the Arduino's pins and other stuff before the main program executes. Additionally, we can choose if we want to start the program and start sending the signal right away using 'digitalWrite'.Bluetooth is one of the most popular wireless communication technologies because of its low power consumption, low cost and a light stack but provides a good range.
In this project, data from a DHT sensor is collected by an Arduino and then transmitted to a smartphone via Bluetooth. To do this the module should be set to command mode. Connect the Key pin to any pin on the Arduino and set it to high to allow the module to be programmed. To program the module, a set of commands known as AT commands are used.
Here are some of them:. Go here to download the library. As this app will be using the onboard Bluetooth adapter, it will have to be mentioned in the Manifest.
Power up the Arduino and turn on the Bluetooth from your mobile. Pair with the HC module by providing the correct passcode — is the default one. Myself Rik and I am founder of Riktronics. My hobby is playing with electronics and making various projects, mainly about embedded systems. Contact me in any need at abhra gmail. Had to join to get the android code but after joining, no code was available — error Good way to get people to enter their information but not a good way to make friends….
Hi Eric, I am sorry for the problem you have faced. Hey there. Did you compile the app from the source code or using the apk file? In either case, did you get the files from this link?
Every single tutorial I see is used to do the bluetooth pairing. I have not done this part yet because arduino code is not complete yet, so can't testbut assuming I use the phone options to do the pairing, I still have no idea how to do the data transmission. How do I receive information on the phone and display it? Look at this In this code you take a MAC address by file and connect to the device automatically. Then you can send and receive string data from Arduino.
You can take inspiration of this code. How are we doing? Please help us improve Stack Overflow. Take our short survey. Learn more. How do I receive bluetooth data from arduino to android? Ask Question. Asked 3 years, 4 months ago. Active 1 year, 5 months ago. Viewed 4k times. Thanks in advance! Active Oldest Votes. SuppressLint; import android.
TargetApi; import android. Activity; import android. AlertDialog; import android. Dialog; import android. BluetoothAdapter; import android. BluetoothDevice; import android. BluetoothSocket; import android. DialogInterface; import android. Intent; import android. ActivityInfo; import android. Uri; import android. AsyncTask; import android.
Build; import android. Bundle; import android.To get things moving along quickly I am going to use the same activity that I used in the last blog to find my paired devices.
This can be found here. Only one thing will change and that is the activity name. Call it DeviceListActivity, as it is no longer the main activity. Now on to the new stuff! When finished it will look like the image below. As we are sending and receiving data this time through Bluetooth rather than just sending there are a few more things to take care of.
First of all is the fact that we cannot simply wait for a bluetooth message to come along on the main thread of our activity. So we need to run a new thread for the bluetooth data receiving to take place on, as well as a handler to update the UI when relevant data has been received.
To get a better idea of how threads and handlers work read this.
Another thing to concern ourselves with may be that we are now getting data in from our Arduino. What do we do with it!!!! If you remember from part 1the data will be arriving in the form: 1.
Finally we can work out where our data is in the string from. The data for sensor 0 will be at elements in the string so we can extract what we need with the use of substring. This procedure is repeated for the remaining three sensors. With that information now acquired we can use setText to display the sensor values in the corresponding textViews.
You will also notice I have added two textViews at the bottom of the app that display the actual data string received from the Arduino sensors. The other view shows the length of the string received, ideally this should be 21 every time. I put this in while debugging but thought it was useful. I have tried to comment a fair bit in the code below so it is clear what part is doing what. However, if you have any questions feel free to send me a message.The concept of controlling or executing a task on Arduino with a mobile phone over Bluetooth has gained enormous popularity in the recent years.
Makers and developers started to create custom applications for this purpose using easy to develop software such as MIT APP inventor. Most of these applications were utilized for sending one way information. This Instructable is aimed at demonstrating a simple method to read an Arduino's sensor data on an Android app based on the sensor selection made by a user Hence, a two way communication.
Did you use this instructable in your classroom? Add a Teacher Note to share how you incorporated it into your lesson. Depending upon the intensity of light projected to the surface of an LDR, it changes its resistance value.
The value of resistance changes from few ohms under sufficient light condition to few Mega Ohms under dark conditions.
Potentiometer is a resistor that can change its value. It has three terminals, i. The pin at the top of the potentiometer is connected with the wiper of the potentiometer. Hence, it outputs a fraction of the supplied VCC voltage. IR Transmitter transmits the IR rays. If there is some object in front of it, then the IR Rays are reflected from the object and is received by the IR Receiver. If there is black object or no object in front of it, then no rays will be reflected.
As black colour absorbs light, the IR Rays are absorbed by the Black colour. The sensor module is equipped with a potentiometer which enables the user to adjust its sensitivity. It is a wireless communication module that transmits data serially. Out of the six pins that comes with general break out board, only 4 pins are used.
RX pin refers to receiver and TX pin refers to transmitter. These pins are used for communication between the Bluetooth and the microcontroller. The system requirement is that only the data of one sensor should be sent to the Android app which is connected via Bluetooth.
Hence, the sensor selection made on the phone and is sent to the Arduino via HC The app has a button that lets the users to connect to an available already paired Bluetooth device. It allows also users to select the necessary sensor from the drop-down list, i. The selected sensor data is read from the Arduino and displayed in the Output Section.
It also has a Section where it displays the address of the connected Bluetooth device. Note: For those who wish to customize the app for their personal projects, you may download the.
The screenshot of the blocks are given for reference. Question 1 year ago. Thank you for your instructable. Any suggestion? Question 2 years ago on Step 9.