Hello,
My intention is to control the brightness (between 0-255) of an LED connected to PWM pin 9 using C++.Net.
I have the code, but in C#.Net. I'm trying to convert this code to C++, but I don't know to convert the last two lines.
This topic is the same given by Pantzmaster in "C#.Net Adjusting Brightness".
Can anyone help me?
My code is this:
#pragma once
namespace CONTROLLED {
using namespace System;
using namespace System::ComponentModel;
using namespace System::Collections;
using namespace System::Windows::Forms;
using namespace System::Data;
using namespace System::Drawing;
using namespace System::IO::Ports;
/// <summary>
/// Summary for Form1
/// </summary>
public ref class Form1 : public System::Windows::Forms::Form
{
public:
Form1(void)
{
InitializeComponent();
serialPort1->PortName = "COM5";
serialPort1->BaudRate = 9600;
serialPort1->Open(); //
ButtonOn->Enabled = false;
Brightness->Enabled=false; //Cannot adjust brightness until the LED is "on"
if(!serialPort1->IsOpen)
{
MessageBox::Show("Could not open port");
}
//
//TODO: Add the constructor code here
//
}
protected:
/// <summary>
/// Clean up any resources being used.
/// </summary>
~Form1()
{
if (components)
{
delete components;
}
}
private: System::Windows::Forms::Button^ ButtonOn;
private: System::Windows::Forms::Button^ ButtonOff;
protected:
protected:
protected:
private: System::Windows::Forms::TextBox^ Brightness;
private: System::Windows::Forms::Label^ label1;
private: System::Windows::Forms::TrackBar^ trackBar1;
private: System::IO::Ports::SerialPort^ serialPort1;
private: System::Windows::Forms::Label^ label2;
private: System::ComponentModel::IContainer^ components;
private:
/// <summary>
/// Required designer variable.
/// </summary>
#pragma region Windows Form Designer generated code
/// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
void InitializeComponent(void)
{
this->components = (gcnew System::ComponentModel::Container());
this->ButtonOn = (gcnew System::Windows::Forms::Button());
this->ButtonOff = (gcnew System::Windows::Forms::Button());
this->Brightness = (gcnew System::Windows::Forms::TextBox());
this->label1 = (gcnew System::Windows::Forms::Label());
this->trackBar1 = (gcnew System::Windows::Forms::TrackBar());
this->serialPort1 = (gcnew System::IO::Ports::SerialPort(this->components));
this->label2 = (gcnew System::Windows::Forms::Label());
(cli::safe_cast<System::ComponentModel::ISupportInitialize^ >(this->trackBar1))->BeginInit();
this->SuspendLayout();
//
// ButtonOn
//
this->ButtonOn->Font = (gcnew System::Drawing::Font(L"Microsoft Sans Serif", 8.25F, System::Drawing::FontStyle::Bold, System::Drawing::GraphicsUnit::Point,
static_cast<System::Byte>(0)));
this->ButtonOn->Location = System::Drawing::Point(49, 50);
this->ButtonOn->Name = L"ButtonOn";
this->ButtonOn->Size = System::Drawing::Size(126, 38);
this->ButtonOn->TabIndex = 0;
this->ButtonOn->Text = L"ON";
this->ButtonOn->UseVisualStyleBackColor = true;
this->ButtonOn->Click += gcnew System::EventHandler(this, &Form1::ButtonOn_Click);
//
// ButtonOff
//
this->ButtonOff->Font = (gcnew System::Drawing::Font(L"Microsoft Sans Serif", 8.25F, System::Drawing::FontStyle::Bold, System::Drawing::GraphicsUnit::Point,
static_cast<System::Byte>(0)));
this->ButtonOff->Location = System::Drawing::Point(351, 50);
this->ButtonOff->Name = L"ButtonOff";
this->ButtonOff->Size = System::Drawing::Size(127, 38);
this->ButtonOff->TabIndex = 1;
this->ButtonOff->Text = L"OFF";
this->ButtonOff->UseVisualStyleBackColor = true;
this->ButtonOff->Click += gcnew System::EventHandler(this, &Form1::ButtonOff_Click);
//
// Brightness
//
this->Brightness->Location = System::Drawing::Point(229, 194);
this->Brightness->Name = L"Brightness";
this->Brightness->Size = System::Drawing::Size(79, 20);
this->Brightness->TabIndex = 2;
//
// label1
//
this->label1->AutoSize = true;
this->label1->Font = (gcnew System::Drawing::Font(L"Microsoft Sans Serif", 8.25F, System::Drawing::FontStyle::Bold, System::Drawing::GraphicsUnit::Point,
static_cast<System::Byte>(0)));
this->label1->Location = System::Drawing::Point(139, 201);
this->label1->Name = L"label1";
this->label1->Size = System::Drawing::Size(84, 13);
this->label1->TabIndex = 3;
this->label1->Text = L"Brightness";
//
// trackBar1
//
this->trackBar1->Location = System::Drawing::Point(163, 124);
this->trackBar1->Maximum = 255;
this->trackBar1->Name = L"trackBar1";
this->trackBar1->Size = System::Drawing::Size(215, 45);
this->trackBar1->TabIndex = 4;
this->trackBar1->Scroll += gcnew System::EventHandler(this, &Form1::trackBar1_Scroll);
//
// serialPort1
//
this->serialPort1->PortName = L"COM5";
this->serialPort1->ReadTimeout = 500;
this->serialPort1->WriteTimeout = 500;
//
// label2
//
this->label2->AutoSize = true;
this->label2->Location = System::Drawing::Point(375, 201);
this->label2->Name = L"label2";
this->label2->Size = System::Drawing::Size(0, 13);
this->label2->TabIndex = 5;
//
// Form1
//
this->AutoScaleDimensions = System::Drawing::SizeF(6, 13);
this->AutoScaleMode = System::Windows::Forms::AutoScaleMode::Font;
this->ClientSize = System::Drawing::Size(525, 402);
this->Controls->Add(this->label2);
this->Controls->Add(this->trackBar1);
this->Controls->Add(this->label1);
this->Controls->Add(this->Brightness);
this->Controls->Add(this->ButtonOff);
this->Controls->Add(this->ButtonOn);
this->Name = L"Form1";
this->Text = L"Form1";
this->FormClosed += gcnew System::Windows::Forms::FormClosedEventHandler(this, &Form1::Form1_FormClosed);
(cli::safe_cast<System::ComponentModel::ISupportInitialize^ >(this->trackBar1))->EndInit();
this->ResumeLayout(false);
this->PerformLayout();
}
#pragma endregion
private: System::Void ButtonOn_Click(System::Object^ sender, System::EventArgs^ e) {
Brightness->Enabled=true;
ButtonOn->Enabled = false;
ButtonOff->Enabled = true;
//Writes "1" to the serial port, the arduino sees this and turns the LED on
serialPort1->Write("1");
label2->Text="LED on";
label2->BackColor = Color::Green;
}
private: System::Void ButtonOff_Click(System::Object^ sender, System::EventArgs^ e) {
//When "Off" button is clicked, disable the Textbox "Brightness" and the "Change" button. Enables "On" button
Brightness->Enabled=false;
ButtonOn->Enabled = true;
ButtonOff->Enabled = false;
serialPort1->Write("0");
label2->Text="LED off";
label2->BackColor = Color::Red;
}
private: System::Void Form1_FormClosed(System::Object^ sender, System::Windows::Forms::FormClosedEventArgs^ e) {
//If we close the form and the port is open, close it.
if(serialPort1->IsOpen)
{
serialPort1->Close();
}
}
private: System::Void trackBar1_Scroll(System::Object^ sender, System::EventArgs^ e) {
Brightness->Text = trackBar1->Value.ToString();
byte[] data = {Convert.ToByte(trackBar1.Value)}; //code in C# (How to convert into c++?)
serialPort1.Write(data, 0, 1);//code in C# (How to convert into c++?)
}
};
}
Here´s the arduino code:
int ledPin = 9;
void setup()
{
pinMode(9, OUTPUT);
Serial.begin(9600);
}
void loop()
{
if(Serial.available())
{
char incomingChar = Serial.read();
//your protocol goes here
static unsigned char PWMValue = 255;
switch(incomingChar)
{
case '1':
// led is ON
analogWrite(ledPin, PWMValue);
break;
case '0':
// led is OFF
analogWrite(ledPin, 0);
break;
default:
//Set PWM
PWMValue = incomingChar;
//Need to check the LED is on first or, set the C# app to app to disable brightness level
//when LED is off;
analogWrite(ledPin, PWMValue);
}
}
}
Thanks!
