Processing 7-segment display

Z SensorWiki


Arduino code for the simple potentiometer measurement with the local displaying of the value on the OpenSegment display.

 Serial7Segment is an open source seven segment display. 

 Note: This code expects the display to be listening at 9600bps. If your display is not at 9600bps, you can
 do a software or hardware reset. See the Wiki for more info: 

 How to use the display:

 To get this code to work, attached an Serial7Segment to an Arduino Uno using the following pins:
 Pin 8 on Uno (software serial TX) to RX on Serial7Segment


#include <SoftwareSerial.h>

SoftwareSerial LEDdisplej(2, 3); //RX pin, TX pin

int adcValue = 0;

void setup() {


  LEDdisplej.begin(9600);  // Talk to the Serial7Segment at 9600 bps
  LEDdisplej.write('v');   // Reset the display - this forces the cursor to return to the beginning of the display

void loop() 
  adcValue = 0;                           // Filter - average from 16 values 
  for (int i = 1; i<=16; i++)
    adcValue = adcValue + analogRead(0);
  adcValue = adcValue/16;

  char tempString[10];                     // Used for sprintf
  sprintf(tempString, "%4d",adcValue);     // Convert into a string that is right adjusted
  //sprintf(tempString, "%d", adcValue);   // Convert into a string that is left adjusted (requires digit 1 command)
  //sprintf(tempString, "%04d", adcValue); // Convert into a string with leading zeros
  //sprintf(tempString, "%4X", adcValue);  // Convert int  HEX, right adjusted
  LEDdisplej.print(tempString);            // Send serial string out the soft serial port to the S7S
  Serial.println(tempString);           // Works too, but we don't need trailing spaces ' ' in the front
  // Serial.println(adcValue);


Corresponding Processing code for receiving the value from serial port and displaying it in the window same way as the OpenSegment did.

import processing.serial.*;

 int adcValue = 0;        // value received from Serial 
 // String Unit="mA";
 // String Unit="kΩ";
 // String Unit="°C";     // We can use Unicode chars directly
 String Unit="\u00B0C";   // Unicode codes may be entered as well
 Serial myPort;
 PFont Segment, Units; 

 void setup() {
                          // Setup the display window 
  size(480, 180);         // Size of the window
  Segment = createFont("Segment7", 150);  // Assign fonts and size 
  Units = createFont("Arial", 40);
  textAlign(RIGHT);        // Text align 
  fill(250,250,0);         // Font color is yellow = red + green

  println(Serial.list());    // List all the available serial ports
  // Then open the port  you're using, my is the first, i.e. '0'
   myPort = new Serial(this, Serial.list()[0], 9600);
 // don't generate a serialEvent() unless you get a newline character:

void draw()
{                      // Let's start to display
  background(0,0,0);   // set the background color black

  text(adcValue, 400, 150);

void serialEvent(Serial myPort) 
 String inString = myPort.readStringUntil('\n');    // get the ASCII string:
 if (inString != null) 
     inString = trim(inString);     // trim off any whitespace
     adcValue = int(inString);      // convert into an integer
     adcValue =int(map(adcValue, 0, 1023, 0, 1023));  // possible range adjusting