PROJEKTOVANJE I IZRADA VIŠEKANALNOG KONTROLERA ZA PROGRAMIBILNI LED IZVOR DIPLOMSKI RAD IZ FIZIČKE ELEKTRONIKE

UVOD Spektralno modulisani LED izvori sa različitim spektralnim doprinosima, namenjeni kalibraciji optičkih detektora. Podesiti doprinose pojedinačnih LED u ukupnom spektru. Podešavanje pomoću odgovarajuće struje. Dobijanje željenog spektra pomoću LED različitih karakteristika. Za kalibraciju optičkih radijacionih pirometara, spektar će imati oblik Plankovog zakona zračenja. Sumiranje unutar integrišuće sfere.

Zadatak

PWM Tehnika dobijanja analognih rezultata digitalno. 1 – 5V, 0 – 0V. Simuliramo napone u rasponu od 0V do 5V menjajući odnos signal-pauza. Velika frekvencija  stabilni napon.

BLOK ŠEMA URE Đ AJA Arduino daje najviše 40mA  moramo da povećamo struju  strujni izvori za svaki kanal.

ARDUINO ATMega 16MHz 15 pina za PWM USB kontroler Napajanje zasebno ili preko USB

PWM LED TESTER

LED PANEL I NIZ LED ZA TESTIRANJE DIP ZIF Kontaktna letvica 1x15 Kontaktna letvica 2x15 sa jumper-ima 5mm LED 20mA (u praksi 40mA) 2.1V pad napona 3 diode u red i 7 paralelno  250mA i 6.3V

STRUJNI IZVORI

POTENCIOMETRI

PCB

KUĆIŠTE I RASPORED KOMPONENATA

PROGRAMIRANJE Kontrola odnosa signal-pauza preko računara za svaki kanal zasebno. Baud Rate = 9600b/s. Određivanje COM porta Unos vrednosti za PWM u % Između 0 i 100 Prijava greške Pretvaranje u 8-bit Kreiranje stringa sa deliteljima String u Int Int u String Slanje na COM port Mapiranje pinova Menjanje frekvencije Čitanje sa serijskog Deljenje stringa String u int PWM

ARDUINO PWM analogWrite(pin, vrednost) Podrazumevane PWM frekvencije: 490Hz i 976Hz Menjamo vrednosti 5 tajmera. Prescaler 1 daje najveću frekvencu: 31.25kHz i 62.5kHz int myEraser = 7; // 111 se koristi za brisanje // postavljamo prescaler za timer 1 na 0 TCCR1B &= ~myEraser; // upisujemo novu vrednost int myPrescaler = 1; TCCR1B |= myPrescaler; // upisujemo prescaler

Provera na osciloskopu: desno pinovi 4 i 13, levo ostali pinovi.

ARDUINO - PROGRAMIRANJE char inputBuffer[100]; // For incoming serial data String s; int pwm[15]; // 0 – 255 String pod; int ledPin[] = {2,3,4,5,6,7,44,45,46,8,9,10,11,12,13}; // maps Arduino pins void setup() { Serial.begin(9600); // Opens serial port, sets data rate to 9600 bit/s. int myEraser = 7; // sets integer that erases timers TCCR0B &= ~myEraser; // erase timer 0 TCCR1B &= ~myEraser; // erase timer 1 TCCR2B &= ~myEraser; // erase timer 2 TCCR3B &= ~myEraser; // erase timer 3 TCCR4B &= ~myEraser; // erase timer 4 TCCR5B &= ~myEraser; // erase timer 5 // Write timers values int myPrescaler = 1; // chose max frequency // write into timers TCCR0B |= myPrescaler; // 62kHz, it affects timing functions by reducing them 62 times TCCR1B |= myPrescaler; // 31kHz TCCR2B |= myPrescaler; // 31kHz TCCR3B |= myPrescaler; // 31kHz TCCR4B |= myPrescaler; // 31kHz TCCR5B |= myPrescaler; // 31kHz } void loop() { if (Serial.available() > 0) { // writes while there is something to read from serial Serial.readBytes(inputBuffer, Serial.available()); // reads from serial into inputBuffer array Serial.print(inputBuffer); // writes what has been read from serial Serial.print("END"); // puts an END at the end of read string } delay(20000); // for default timer 0, enough is this value divided by 62 set it to 20k pod = String(inputBuffer); // PWM starts here, for all pins for (int x=0; x =parserCnt){ rFromIndex = rToIndex+1; rToIndex = s.indexOf(parser,rFromIndex); if(index == parserCnt){ if(rToIndex == 0 || rToIndex == -1){ return '\0'; } return s.substring(rFromIndex,rToIndex); } else{ parserCnt++; } } return rs; }

JAVA FORMA PWM LED br. poklapaju se sa onima na kućištu. Arduino Pin odgovaraju rednom br. PWM pina na boardu. Unosimo vrednosti od 0 do 100. Ukoliko unesemo vrednost van ovog opsega, izaći će prozor koji prijavljuje grešku. Pritiskom na dugme „Apply“, procenti se pretvaraju u 8-bitne vrednosti (od 0 do 255), što se i ispisuje za svaki pin. Tako đ e se šalje informacija na USB i ispisuje koji je COM port odredio operativni sistem za Arduino.

JAVA KOD package arduinoserialtest; import javax.swing.JOptionPane; import jssc.SerialPort; import jssc.SerialPortEvent; import jssc.SerialPortEventListener; import jssc.SerialPortException; import jssc.SerialPortList; public class NewJDialog extends javax.swing.JDialog { jssc.SerialPort serialPort; String izabraniPort = ""; String tmp=""; String primljeno=""; int percent[]; String percents[]; int bin[]; String bins[]; String percentInput; String zaSlanje = ""; public NewJDialog() { initComponents();} class SerialPortReader implements SerialPortEventListener { public void serialEvent(SerialPortEvent event) { if (event.getEventValue() == 0) { return;} //Read from serial until the END is received if (event.isRXCHAR()) {try { byte buffer[] = serialPort.readBytes(event.getEventValue()); tmp = tmp + new String(buffer); if (new String(buffer).indexOf("END") > -1) { primljeno = tmp.split("END")[0]; tmp = ""; //clear what has been read}} catch (SerialPortException ex) { // System.out.println(ex);}}}} private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) { try { // detect com port for Arduino String[] portNames = SerialPortList.getPortNames(); if (portNames == null) { System.out.println("sout"); //print if nothing is detected return;} // Print out working COM port for (int i = 0; i < portNames.length; i++) { // System.out.println("port: " + portNames[i].toString()); izabraniPort = portNames[i].toString(); comport.setText(izabraniPort); // write com port into textbox}} serialPort = new SerialPort(izabraniPort); serialPort.openPort(); serialPort.setParams(SerialPort.BAUDRATE_9600, SerialPort.DATABITS_8, SerialPort.STOPBITS_1, SerialPort.PARITY_NONE, false, false); // speed is 9600 to match Arduino, false statements at the end exist so that Arduino does not get reset each time there is a read int mask = SerialPort.MASK_RXCHAR + SerialPort.MASK_CTS + SerialPort.MASK_DSR;//Prepare mask serialPort.setEventsMask(mask);//Set mask serialPort.addEventListener(new SerialPortReader()); // Catch port package arduinoserialtest; import javax.swing.JOptionPane; import jssc.SerialPort; import jssc.SerialPortEvent; import jssc.SerialPortEventListener; import jssc.SerialPortException; import jssc.SerialPortList; public class NewJDialog extends javax.swing.JDialog { jssc.SerialPort serialPort; String izabraniPort = ""; String tmp=""; String primljeno=""; int percent[]; String percents[]; int bin[]; String bins[]; String percentInput; String zaSlanje = ""; public NewJDialog() { initComponents();} class SerialPortReader implements SerialPortEventListener { public void serialEvent(SerialPortEvent event) { if (event.getEventValue() == 0) { return;} //Read from serial until the END is received if (event.isRXCHAR()) {try { byte buffer[] = serialPort.readBytes(event.getEventValue()); tmp = tmp + new String(buffer); if (new String(buffer).indexOf("END") > -1) { primljeno = tmp.split("END")[0]; tmp = ""; //clear what has been read}} catch (SerialPortException ex) { // System.out.println(ex);}}}} private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) { try { // detect com port for Arduino String[] portNames = SerialPortList.getPortNames(); if (portNames == null) { System.out.println("sout"); //print if nothing is detected return;} // Print out working COM port for (int i = 0; i < portNames.length; i++) { // System.out.println("port: " + portNames[i].toString()); izabraniPort = portNames[i].toString(); comport.setText(izabraniPort); // write com port into textbox}} serialPort = new SerialPort(izabraniPort); serialPort.openPort(); serialPort.setParams(SerialPort.BAUDRATE_9600, SerialPort.DATABITS_8, SerialPort.STOPBITS_1, SerialPort.PARITY_NONE, false, false); // speed is 9600 to match Arduino, false statements at the end exist so that Arduino does not get reset each time there is a read int mask = SerialPort.MASK_RXCHAR + SerialPort.MASK_CTS + SerialPort.MASK_DSR;//Prepare mask serialPort.setEventsMask(mask);//Set mask serialPort.addEventListener(new SerialPortReader()); // Catch port

// Calculations percent = new int[16]; // define array length percents = new String[16]; // define array length bin = new int[16]; bins = new String[16]; // get string values from textboxes percents[1] = percentInput1.getText(); percents[2] = percentInput2.getText(); percents[3] = percentInput3.getText(); percents[4] = percentInput4.getText(); percents[5] = percentInput5.getText(); percents[6] = percentInput6.getText(); percents[7] = percentInput7.getText(); percents[8] = percentInput8.getText(); percents[9] = percentInput9.getText(); percents[10] = percentInput10.getText(); percents[11] = percentInput11.getText(); percents[12] = percentInput12.getText(); percents[13] = percentInput13.getText(); percents[14] = percentInput14.getText(); percents[15] = percentInput15.getText(); // Do for all 15 fields zaSlanje = ""; for (int x=1; x<=15; x++) { percent[x] = Integer.parseInt(percents[x]); // set int values bin[x] = (int) Math.round(2.55 * percent[x]); //convert percent to 8-bit value bins[x] = Integer.toString(bin[x]); //convert to string zaSlanje = zaSlanje + bins[x] + ","; // Check if values are withing percent range if (percent[x] 100) { // Error input report with message box System.out.println("Error"); NewJDialog.infoBox("Input values must be between 0 and 100", "Error"); } // System.out.println(zaSlanje + "\n"); //test weather it sends proper values // Display 8-bit values in label bitvalue1.setText(bins[1]); bitvalue2.setText(bins[2]); bitvalue3.setText(bins[3]); bitvalue4.setText(bins[4]); bitvalue5.setText(bins[5]); bitvalue6.setText(bins[6]); bitvalue7.setText(bins[7]); bitvalue8.setText(bins[8]); bitvalue9.setText(bins[9]); bitvalue10.setText(bins[10]); bitvalue11.setText(bins[11]); bitvalue12.setText(bins[12]); bitvalue13.setText(bins[13]); bitvalue14.setText(bins[14]); bitvalue15.setText(bins[15]); //serialPort.writeString(text.getText()); // Set String to send over // String zaSlanje = "100,0,100,0,100,0,100,0,100,0,100,0,100,0,100,"; serialPort.writeString(zaSlanje); System.out.println("Sending String" + zaSlanje); try { Thread.sleep(500); } catch (InterruptedException ex) { } // System.out.println("primljeno: " + primljeno); // print what is received over serial serialPort.closePort(); } catch (SerialPortException ex) { System.out.println("greska: " + ex); } // Calculations percent = new int[16]; // define array length percents = new String[16]; // define array length bin = new int[16]; bins = new String[16]; // get string values from textboxes percents[1] = percentInput1.getText(); percents[2] = percentInput2.getText(); percents[3] = percentInput3.getText(); percents[4] = percentInput4.getText(); percents[5] = percentInput5.getText(); percents[6] = percentInput6.getText(); percents[7] = percentInput7.getText(); percents[8] = percentInput8.getText(); percents[9] = percentInput9.getText(); percents[10] = percentInput10.getText(); percents[11] = percentInput11.getText(); percents[12] = percentInput12.getText(); percents[13] = percentInput13.getText(); percents[14] = percentInput14.getText(); percents[15] = percentInput15.getText(); // Do for all 15 fields zaSlanje = ""; for (int x=1; x<=15; x++) { percent[x] = Integer.parseInt(percents[x]); // set int values bin[x] = (int) Math.round(2.55 * percent[x]); //convert percent to 8-bit value bins[x] = Integer.toString(bin[x]); //convert to string zaSlanje = zaSlanje + bins[x] + ","; // Check if values are withing percent range if (percent[x] 100) { // Error input report with message box System.out.println("Error"); NewJDialog.infoBox("Input values must be between 0 and 100", "Error"); } // System.out.println(zaSlanje + "\n"); //test weather it sends proper values // Display 8-bit values in label bitvalue1.setText(bins[1]); bitvalue2.setText(bins[2]); bitvalue3.setText(bins[3]); bitvalue4.setText(bins[4]); bitvalue5.setText(bins[5]); bitvalue6.setText(bins[6]); bitvalue7.setText(bins[7]); bitvalue8.setText(bins[8]); bitvalue9.setText(bins[9]); bitvalue10.setText(bins[10]); bitvalue11.setText(bins[11]); bitvalue12.setText(bins[12]); bitvalue13.setText(bins[13]); bitvalue14.setText(bins[14]); bitvalue15.setText(bins[15]); //serialPort.writeString(text.getText()); // Set String to send over // String zaSlanje = "100,0,100,0,100,0,100,0,100,0,100,0,100,0,100,"; serialPort.writeString(zaSlanje); System.out.println("Sending String" + zaSlanje); try { Thread.sleep(500); } catch (InterruptedException ex) { } // System.out.println("primljeno: " + primljeno); // print what is received over serial serialPort.closePort(); } catch (SerialPortException ex) { System.out.println("greska: " + ex); }

POVEZIVANJE LED I MERENJE JAČINE STRUJE Moguće je priključiti po 3 LED na svakom kanalu. A – merenje struje, V – pada napona. Za tačnu amplitudu struje, podesiti signal na 1.