Microduino Mobile Bluetooth Controls RGB Lights

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  • Project:Microduino Mobile Bluetooth Controls the Color of RGB Lights
  • Objective:Set the connection between mobile phone and Microduino Core using the Microduino BT module and then to control the color of RGB lights.
  • Difficulty:High
  • Time-consuming:5 hours
  • Maker:Microduino Studio-YLB


Mobile clients can simulate the color of the lights via three progress indicators which send the quantitative values obtained from simulation experiment to Microduino Core via BT. Thus, we can easily control the color of RGB lights by calculating since we get both the simulated values and using function analogWrite(). In order to have a better control experience, we need to connect pins of RGB lights to those of PMW(3、5、6、11) . Since both Microduino BT and Microduino Core adopt soft serial port for communication, we can't connect RGB lights to pins (9,10). Otherwise, data chaos may appear.

Bill of Materials

  • Microduino Equipments
Modules Number Function
Microduino-Core 1 Core module
Microduino-FT232R 1 Download program
Microduino BT(2.1) 1 Bluetooth communication
  • Other Equipments
RGB lights 1 For display
USB cable 1 For power supply and program download
Small 3D print box 1 For beauty


Android Client-side: File:Microduino RGB.zip

Notice:Make sure your BT is the 2.1 version since Android client-side is only suitable for 2.1 BT temporarily

Program Test:



  • Step 1:Prepare all equipments
    Microduino BT RGB all.jpg
  • Step 2:Make sure your BT serial port connection method is right.

Using soft serial port (9,10) for program test.

    • If you adopt serial port (2,3)
      • And if you use Core, please change "SoftwareSerial mySerial(9, 10);" to "SoftwareSerial mySerial(2, 3);"
      • Or if you use Core+, you need to change "mySerial" of the "loop" to "Serial1".
    • If you adopt serial port (0,1)
      • You need to change "mySerial" of the "loop" to "Serial1".and can't fold BT in the download, or the serial ports will conflict.
  • Step 3:Build a Circuit
    • Overlay modules available
    • Make sure RGB pins are of common anode
      • The longest pin is positive or the widest one when you look at the RGB light in the head. Here, no electric resistance is adopted and the pin will be connected to 3.3V of electricity.
      • Players can directly measure the corresponding color of the other three pins through a multimeter or a module. And then connect the pins correspondingly.
Microduino BT RGB ok.jpg
  • Step 4:Download test program and then open it.
    • First, make sure your BT serial port connection method is right, which can refer to step 2.
    • Make sure the RGB lights are of common anode. If not, you need to:
      • Change the solution:The longest pin refers to negative and meanwhile, you need to connect it to GND.
      • Change program: you need to change analogWrite(); eg: To convert “analogWrite(6, 255 - red);”to “analogWrite(6, red);”
  • Step 5:After that, you need to compile program and then download .
  • Step 6:Download Android client-side, uncompress, install and open it.
  • Step 7:Search equipments and then connect.
Microduino BT RGB BT.jpg
  • Step 8:If the connection goes well, then the lights can be easily controlled by mobile Bluetooth. Otherwise, you have to reconnect. After several times of failed connection, you can either power down and reset the system, or just shut off the client-side and restart.
Microduino BT RGB result1.jpg
Microduino BT RGB result2.jpg


You can successfully control RGB lights through mobile phone.


  • Make sure the serial port connection method of BT is right
  • Figure out whether the RGB lights are of common anode or common cathode
  • Pay attention to the connection method of RGB lights. If you find errors occur among color progress indicators and their corresponding RGB lights, you can also change pins of "analogWrite();" and make it right.