Published February 25, 2018 © GPL3+

8bit Number Display

We convert a decimal number between 0 and 255 to binary and then show the number by using 8 LED.

BeginnerFull instructions provided1 hour3,736

Things used in this project

Hardware components

Arduino UNO

SparkFun LilyPad LED White (5pcs)

Jumper wires (generic)

Resistor 10k ohm

Breadboard (generic)

Software apps and online services

Arduino IDE

Microsoft Visual Studio 2015

Story

This is a very simple project. You just connect 8 LED to the Arduino and then input a number and the LEDs show you the number.

private void Send_Click(object sender, EventArgs e)
       {
           try
           {
               int IntValue = Convert.ToInt32(Value.Text);
               if (IntValue >= 0 && IntValue <=255)
               {
                   string ToSend =Value.Text +";"+ ToBinary(Value.Text);
                   Console.WriteLine(ToSend);
                   port.WriteLine(ToSend);
               }
               else
               {
                   MessageBox.Show("Invalid Input", "Error");
               }
           }
           catch (Exception ex)
           {
               MessageBox.Show(ex.Message, "Error");
           }
       }
       private string ToBinary(string data)
       {
           string result = string.Empty;
           int rem = 0;
           try
           {
               int num = int.Parse(data);
               for (int i = 0; i < 8; i++)
               {
                   rem = num % 2;
                   num = num / 2;
                   result = rem.ToString() + ";" + result;
               }
           }
           catch (Exception ex)
           {
               MessageBox.Show(ex.Message, "Error");
           }
           Seprate(result);
           return result;
       }
       private void Seprate(string result)
       {
           String[] bits = result.Split(';');
           if (bits[7] == "0") { p0.Checked = false; } else if (bits[7] == "1") p0.Checked = true;
           if (bits[6] == "0") { p1.Checked = false; } else if (bits[6] == "1") p1.Checked = true;
           if (bits[5] == "0") { p2.Checked = false; } else if (bits[5] == "1") p2.Checked = true;
           if (bits[4] == "0") { p3.Checked = false; } else if (bits[4] == "1") p3.Checked = true;
           if (bits[3] == "0") { p4.Checked = false; } else if (bits[3] == "1") p4.Checked = true;
           if (bits[2] == "0") { p5.Checked = false; } else if (bits[2] == "1") p5.Checked = true;
           if (bits[1] == "0") { p6.Checked = false; } else if (bits[1] == "1") p6.Checked = true;
           if (bits[0] == "0") { p7.Checked = false; } else if (bits[0] == "1") p7.Checked = true;
       }

Schematics

Code

Code

int p0 = 2;
int p1 = 3;
int p2 = 4;
int p3 = 5;
int p4 = 6;
int p5 = 7;
int p6 = 8;
int p7 = 9; 

void setup() { 
  Serial.begin(9600);
pinMode(p0, OUTPUT); 
pinMode(p1, OUTPUT); 
pinMode(p2, OUTPUT); 
pinMode(p3, OUTPUT); 
pinMode(p4, OUTPUT); 
pinMode(p5, OUTPUT); 
pinMode(p6, OUTPUT); 
pinMode(p7, OUTPUT); 

}

void loop() { 

}
//////////////////
String Splitter(String data, char separator, int index)
{
    int found = 0;
    int strIndex[] = { 0, -1 };
    int maxIndex = data.length() - 1;
    

    for (int i = 0; i <= maxIndex && found <= index; i++) {
        if (data.charAt(i) == separator || i == maxIndex) {
            found++;
            strIndex[0] = strIndex[1] + 1;
            strIndex[1] = (i == maxIndex) ? i+1 : i;
        }
    }
    return found > index ? data.substring(strIndex[0], strIndex[1]) : "";
}
///////////////////////////
void serialEvent (){
  _clear();
  String serialResponse = Serial.readString();
   String Number = Splitter(serialResponse, ';', 0);
   String led0 = Splitter(serialResponse, ';', 1);
   String led1 = Splitter(serialResponse, ';', 2);
   String led2 = Splitter(serialResponse, ';', 3);
   String led3 = Splitter(serialResponse, ';', 4);
   String led4 = Splitter(serialResponse, ';', 5);
   String led5 = Splitter(serialResponse, ';', 6);
   String led6 = Splitter(serialResponse, ';', 7);
   String led7 = Splitter(serialResponse, ';', 8);
   if (led0 == "1") digitalWrite(p0, HIGH); 
      if (led1 == "1") digitalWrite(p1, HIGH); 
         if (led2 == "1") digitalWrite(p2, HIGH); 
            if (led3 == "1") digitalWrite(p3, HIGH); 
               if (led4 == "1") digitalWrite(p4, HIGH); 
                  if (led5 == "1") digitalWrite(p5, HIGH); 
                     if (led6 == "1") digitalWrite(p6, HIGH); 
                        if (led7 == "1") digitalWrite(p7, HIGH); 
}
void _clear()
{
  digitalWrite(p0, LOW); 
  digitalWrite(p1, LOW); 
  digitalWrite(p2, LOW); 
  digitalWrite(p3, LOW); 
  digitalWrite(p4, LOW); 
  digitalWrite(p5, LOW); 
  digitalWrite(p6, LOW);
  digitalWrite(p7, LOW); 

}