![]() First, we should set the permissions in the AndroidManifest file. Let’s begin with an example of the Android code. If we receive 2 then we change the state of the LED to LOW so it will go out. If we receive 1, then we change the state of the LED to high so it will light up. We can assitn this to a variable, if the result is ‘yes’. In the loop method, we check if we received any data via serial. Of course, we also initialize serial transmission here. Let’s get back to the setup() method, we set pin 13 as an output because we would like to steer this LED not get information from it. Here, we will change the state of a LED according to the Bluetooth data received. In microcontrollers, Hello World is just an LED blinking. Here, we just have a Hello World that is a little more advanced. You can achieve such a great thing like the wireless transmission with almost no effort. So here we use the serial transmission to send text SoftwareHut and add a one second delay. The second method, loop(), is an infinite loop of a program. The only thing that is important from the start is that we should set the same baud rate on Arduino and on the Bluetooth module’s side. We set it to that specific number because our HC-06 Bluetooth module is configured to that number by default. The higher the baud rate, the more sensitive the transmission becomes to noise. ![]() Baud rate is the maximum number of chars that we can send in one second. First setup(): in this method, we initialize serial transmission at baud rate 9600. This is a good occasion to briefly explain Arduino’s code syntax.Īs you can see, we have two main methods here. The only difference is that, in the first option, we plug the Bluetooth module into the proper pins in Arduino, and in the second we don’t. From the perspective of code, sending anything wirelessly is exactly the same as sending data by wire. ![]() That’s it… All we need is seven lines of code! Notice that I do not even use any external libraries.Īll of the magic is hidden in the hardware. Similarly, Bluetooth technology has united technologies that differ from each other significantly.īluetooth is the standard for short-range, wireless communication between various electronic devices such as mobile phones, tablets, PC, headphones and even pressure cookers, which allow for adjusting the cooking timer and temperature through an app via Bluetooth. Around 970, he was able to unite the fighting Danish and Norwegian tribes in a non-violent way. The English translation of Blåtand is – you guessed it – Bluetooth. ![]() It derives from the nickname of the Viking, Danish king Harald Blatand. What is Bluetooth?Īn interesting part of Bluetooth is its name. In my opinion, Arduino will be the best choice to start programming microcontrollers. If you would like to develop more complicated devices and create your own printed circuits (PCB), then you should dig into electronics. To find schematics like this, you only need to tap in the name of the sensor or module plus Arduino and then go to Google Graphics, and the proper schema should be there. They also share simplified electronic schematics like in the picture below. The Arduino community likes to share their projects on the web. At the beginning, electronics is not a big deal. Many programmers give up their interests in microcontrollers due to fear of electronics.Additionally, Arduino IDE uses a simplified version of C++, making it easier to learn how to program.Unlike most previous programmable circuit boards, the Arduino does not need a separate piece of hardware (called a programmer) in order to load new code onto the board – you can simply use a USB cable.Community, which willingly shares their knowledge and complete projects on the web, so it is easy for us to start.
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