Android App that Sends a Message to Your Arduino

In this project I’m going to show an Android app that sends a message to your Arduino via bluetooth. And that message will be displayed in a Doted Matrix display.

Parts Required

• 1x Arduino Uno
• 1x DMD (P10)
• 1x Bluetooth Module (for example: HC-05)
• 1x Smartphone (any Android will work, I’ve only tested with LG G2)
• Android Application (you can download it in the next step)
• 1x Breadboard
• Jumper Cables

Schematics

Source Code link

Note: If you want to edit my app this is what you need to do. Download Send_Message.aia and upload it to MIT App Inventor. 

Tips:

• You need to remove the RX and TX cables when you’re uploading the sketch to your Arduino.

• Sometimes people connect the TX from the bluetooth module to the TX of the Arduino… that’s wrong and it won’t work. Make sure you connect it properly, the TX into RX and the RX into the TX.

• If the HC-05 Bluetooth Module asks for a password, It’s ’1234′.

• Before Testing my android app, test if you’ve made all the connections correctly. How you can do that? Simply enter some messages (for example: “Random”) into your serial monitor and your DMD should display that message.

I hope you found this useful!
Do you have any questions? Leave a comment down below!
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