Android MIT App Inventor – Auto Connect To Bluetooth

In a previous post I showed how to connect an app inventor Android app to a Bluetooth module connected to an Arduino to control an LED. See Turning a LED on and off with an Arduino, a HC-06 and Android

A few people have asked how to make it so that the app auto-connect to the Arduino on start up and I thought I would offer my solution. This example adds to the previous guide.

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Updated on 06.08.2016

Controlling an Arduino over Bluetooth from Android using App Inventor 2

Here is an example of controlling the Arduino over Bluetooth using a HC-06 bluetooth module and an Android app. The example uses an Arduino Nano but other Arduinos will work just as well. A HC-05 module can be used stead of the HC-06.

arduinoBTcontrol - breadboard

The Android app was created in app inventor and the aia file can be downloaded at the bottom of the page.

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Turning a LED on and off with an Arduino, Bluetooth and Android. Part II: 2 way control

In the first part I showed how to control a single LED from an app created in App Inventor. This worked OK but was very limited. You could control only 1 LED and the control was one way; from the app to the Arduino. What if you want to have 2 way control of the LED and to be able to also control the LED from the Arduino side? What if you want to control more than 1 LED?

In this guide we look at adding two-way communication. Here we control an LED but you could have it doing anything.

Arduino-AI2-Bluetooth_1LED_01In first example you could only control the LED from the Android app, here we extend the example so that we can also control the LED at the Arduino side. When the LED is turned on or off by the Arduino we want the button in the app to update to show the correct LED status.

The first example used methods only suitable for controlling one LED, this time we will try to make it so the Arduino sketch and also the AI2 app can be easily scaled and so once you have the basic app in place adding extra buttons and controls should be fairly straight forward.

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Turning a LED on and off with an Arduino, a HC-06 and Android

Although I use a HC-06 in the below examples the HC-05 in slave mode can also be used.

Using MITs app inventor it is fairly easy to create an app that can turn a LED on and off from an Android device.

This is a fairly simply example of sending commands to the Arduino to turn a LED either on or off. The Android app sends ascii codes to the Arduino via the HC-06 BT module; “ON” for on and “OF” for off.

Load the app, connect to the HC-06 and then use the LED button to turn the LED on and off.


You can also open the serial monitor to see the commands as they are received

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