Hi, this is my first instractables, today i'll show you how to make an rgb controller with an arduino UNO R3, controlled by an application made in vb.net

With this project you can simply control your led strip and make what colour you like

excuse me for my english, i hope you like my instructable

Step 1: Parts and Material

These are the materials:

1 arduino uno
1 usb for arduino (programming or connection)
1 bluetooth module (optional but make this project wireless)
Arduino IDE
Visual studio

Step 2: Arduino Code

The arduino code is very simple but powerfull

code:

int ledrPin = 9;
int ledgPin = 10;
int ledbPin = 11;
void setup() {
  Serial.begin(9600);
  pinMode(ledrPin, OUTPUT);
  pinMode(ledgPin, OUTPUT);
  pinMode(ledbPin, OUTPUT);
}
void loop() {
  if (Serial.available() > 0) {
    int r = Serial.parseInt();
    int g = Serial.parseInt();
    int b = Serial.parseInt();
 

    analogWrite(ledrPin, r);
    analogWrite(ledgPin, g);
    analogWrite(ledbPin, b);
 }
}<br>

Copy and paste this code into the arduino ide

now you have to upload it to your board

Step 3: Vb.net Code

You have to open visual studio or visual basic

Create a new project
name it like "rgb controller"

Once the form is created drag and drop this control to the form:

1 label and set the text to: "Select the COM port"
1 combobox
1 button and name it: "refresh"
3 trackbar (set minimum value to 0 and maximum value to 255)
1 label at the bottom and set the text to: "Rgb: 255,255,255"
1 picturebox (set the backcolor to white, to see what colour we have select)
1 timer

Now we have to write the code for the rgb controller

before all write:

Imports System.IO.Ports

under Public Class Form1 write:

Dim connected As Boolean = False   Dim r As Integer
Dim port As New SerialPort
Dim r As Integer = 255<br>Dim g As Integer = 255
Dim b As Integer = 255
Dim rgb As String = TrackBar1.Maximum - TrackBar1.Value + TrackBar1.Minimum & "," & TrackBar2.Maximum - TrackBar2.Value + TrackBar2.Minimum & "," & TrackBar3.Maximum - TrackBar3.Value + TrackBar3.Minimum & "M"

create a new function called COMport to search all the serial port avaible and add to the combobox

Function COMport()<br>        ComboBox1.Items.Clear()
        ComboBox1.Items.AddRange(SerialPort.GetPortNames)
    End Function

in the form1.load call COMport()

Private Sub Form1_Load(sender As System.Object, e As System.EventArgs) Handles MyBase.Load<br>        COMport()
    End Sub

Double click on the refresh button and add the same call COMport()

Double click on the combobox and add this code to set the port option

Private Sub ComboBox1_SelectedIndexChanged(sender As System.Object, e As System.EventArgs) Handles ComboBox1.SelectedIndexChanged
        connected = True
        port.Close()
        port.PortName = ComboBox1.SelectedItem.ToString
        port.BaudRate = 9600
        port.DataBits = 8
        port.Parity = Parity.None
        port.StopBits = StopBits.One
        port.Handshake = Handshake.None
        port.Encoding = System.Text.Encoding.Default
    End Sub

Now set the timer to enabled with an interval of 1 and add this code to the timer tick event

Private Sub Timer1_Tick(sender As System.Object, e As System.EventArgs) Handles Timer1.Tick
        rgb = TrackBar1.Maximum - TrackBar1.Value + TrackBar1.Minimum & "," & TrackBar2.Maximum - TrackBar2.Value + TrackBar2.Minimum & "," & TrackBar3.Maximum - TrackBar3.Value + TrackBar3.Minimum & "M"
        Label2.Text = "Rgb: " & r & "," & g & "," & b
        PictureBox1.BackColor = Color.FromArgb(r, g, b)
        If connected = True Then
           If port.IsOpen Then
                Try
                    port.Write(rgb)
                    port.Close()
                Catch ex As Exception
                End Try
         Else
                Try
                    port.Open()
                    port.Write(rgb)
                    port.Close()
                Catch ex As Exception
                End Try
            End If
        End If
    End Sub<br>

Now there is the part of the code for change the code through the three trackbar

Double click on the first trackbar and here is the code

r = TrackBar1.Value

The second trackbar code

g = TrackBar2.Value

the third trackbar code

b = TrackBar3.Value

Step 4: The Connection

If you connect only 1 led, it only need arduino, wire, resistor and the led, but if you want to connect an rgb strip, you have to use an amplifier for strip like this

the connection is:

pin 9 to resistor to - red
pin 10 to resistor to - green
pin 11 to resistor to - blue
vcc to + led

It's time to compile and test the app
i've only tested the connection through usb, before you choose the serial port, you have to connect arduino to usb and connect the program through the arduino COM