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| Riadok 1: |
Riadok 1: |
| | | __TOC__ |
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| Riadok 73: |
Riadok 73: |
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| Deadline: <FONT COlor="red">'''27. 2. 2018 '''</font> | | Deadline: <FONT COlor="red">'''27. 2. 2018 '''</font> |
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| == Pripojenie LED a LCD displeja a lokálne zobrazenie meranej veličiny ==
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| __TOC__
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| == Programovateľný LCD displej ==
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| * LCD zobrazovač. Klávesnica. <BR>[http://ap.urpi.fei.stuba.sk/mmp/prednaska02.pdf Obšírnejšie informácie o displejoch] (prednáška z predmetu MMP)
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| === LCD Modul ===
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| [[Obrázok:ParallaxLCDAppMod.jpg|left]]
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| '''Vlastnosti:'''
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|
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| * 2x8 LCD Displej bez podsvetlenia
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| * 4 Tlačítka
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| * Trimer na zmenu kontrastu
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| '''Technické parametre:'''
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| * Napájanie: 5 V @ 15 mA
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| * Pripojenie: 4-Bit parallel interface (Hitachi HD44780 compatible)
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| * Rozmery: 60 x 50 x 20 mm
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| * Pracovná teplota: 0 až +70 °C
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| [[Obrázok:Acrob_LCD_Schematic.png|center]]
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| [[Obrázok:Acrob_LCD_Schema2.png|800px|center]]
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| === Úlohy ===
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| Najprv sa snažte pochopiť, ako je vytvorený vzorový program, ako sa konfiguruje pripojenie LCD k portom, skontrolujte konfiguráciu. Potom modifikujte program z predošlého cvičenia tak, aby
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| sa meraná hodnota polohy potenciometra zobrazila na displeji. Zobrazte aj inžinierske jednotky.
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| === Literatúra ===
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| * Katalógové listy
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| ** Radič Hitachi [http://ap.urpi.fei.stuba.sk/mmp/HD44780.pdf HD44780]
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| ** Displej 2x16 [http://ap.urpi.fei.stuba.sk/mmp/DEM16216SYH-LY.pdf DEM 16216 SYH-LY]
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| ** Displej 2x16 [http://ap.urpi.fei.stuba.sk/mmp/DEM20231SYH-PY.pdf DEM 20231 SYH-PY]
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| ** 2x16 Parallel LCD [http://www.parallax.com/Portals/0/Downloads/docs/prod/audiovis/lcd2x16par.pdf datasheet]
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| ** Podrobné manuály sú aj u [http://www.hantronix.com/page/index/products/character výrobcu Hantronix].
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| * Peter Ouwehand: '''[http://home.iae.nl/users/pouweha/lcd/lcd.shtml How to control a HD44780-based Character-LCD]'''
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| * Ian Harries: ''[http://www.doc.ic.ac.uk/%7Eih/doc/lcd/ HD44780-Based LCD Modules]'''
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| * Tomáš Dresler: '''[http://www.hw.cz/ART632-Inteligentni-displeje-a-jejich-pripojeni-k-PC.html Inteligentní displeje a jejich připojení k PC]'''. [hw.cz]
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| * Nuts & Volts: [http://www.parallax.com/dl/docs/cols/nv/vol1/col/nv31.pdf Demystifying Character Based LCDs]
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| * Stamp Works - pp. 73 and more [http://www.parallax.com/Portals/0/Downloads/docs/books/sw/Web-SW-v2.1.pdf]
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| === Arduino ===
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| Nasledovný príklad je pre Arduino.
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| Pozn.: Ak budete vypisovať najprv štvorciferné číslo a potom trojciferné, nezabudnite to štvorciferné najprv vymazať, inak vám tam posledná cifra bude "visieť". Vymazať sa dá napríklad takto:
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| // 12345678
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| lcd.print(" ");
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| * [https://www.arduino.cc/en/Reference/LiquidCrystal LCD Library]
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| <source lang="c">
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| /*
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| LiquidCrystal Library - Hello World
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| Demonstrates the use a 8x2 LCD display.
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| The circuit:
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| * LCD RS pin to digital pin 3
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| * LCD R/W pin to digital pin 2
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| * LCD Enable pin to digital pin 1
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| * LCD D4 pin to digital pin 4
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| * LCD D5 pin to digital pin 5
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| * LCD D6 pin to digital pin 6
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| * LCD D7 pin to digital pin 7
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| */
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| #include <LiquidCrystal.h> // include the library
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| // initialize the library with the numbers of the interface pins
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| // LiquidCrystal(RS, RW, EN, D4, D5, D6, D7)
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| LiquidCrystal lcd( 3, 2, 1, 4, 5, 6, 7);
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|
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| void setup() {
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| // set up the LCD's number of columns and rows:
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| lcd.begin(8, 2);
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| // Print a message to the LCD.
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| lcd.print("Ahoj!");
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| }
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| void loop() {
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| // set the cursor to column 0, line 1
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| // (note: line 1 is the second row, since counting begins with 0):
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| lcd.setCursor(0, 1);
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| // print the number of seconds since reset:
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| lcd.print(millis()/1000);
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| // print the status of buttons:
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| lcd.setCursor(6, 0);
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| lcd.print(ReadButtons(),HEX);
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| }
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| /* ------------------------------------------------------- */
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| /* Read and debounce the LCD AppMod buttons */
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| /* */
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| /* Returns 0 if nothing is pressed */
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| /* Returns 1 if button A is pressed */
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| /* Returns 2 if button B is pressed */
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| /* Returns 4 if button C is pressed */
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| /* Returns 8 if button D is pressed */
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| /* Returns combination if more is pressed (e.g. 6 for B+C)*/
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| /* */
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| /* ------------------------------------------------------- */
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| unsigned char ReadButtons()
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| {
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| DDRD = 0b00001110; // make LCD bus inputs
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| unsigned char state = 0xFF; // assume nothing pressed
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| for(int scan = 1; scan<=10; scan++)
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| {
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| state = state & ((PIND&0xF0)>>4); // make sure button held
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| delay(5); // debounce 10 x 5 ms
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| }
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| DDRD = 0b11111110; // return bus to outputs
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| return(state);
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| }
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| </source>
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| Misc:
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| * [http://www.geocities.com/dinceraydin/djlcdsim/djlcdsim.html LCD Display Simulator]
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| * [http://www.geocities.com/dinceraydin/lcd/charcalc.htm Custom Character Calculator]
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| Prečo je takto napísaná a ako vlastne funguje lepšie zistíte, keď si preštudujete schému zapojenia:
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| [[Obrázok:LCD_App_Mod_Schematic.png|center|450px]]
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| == Sedemsegmentový 4-miestny LED displej ==
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| * 4-miestny 7-segmentový displej
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| ** Product page http://www.gme.sk/hd-m324rd-p512-924
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| ** Datasheet http://www.gme.sk/img/cache/doc/512/924/hd-m324rd-datasheet-1.pdf
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| ** Animácia k 7seg displeju: http://www.uize.com/examples/seven-segment-display.html
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|
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| === Programovanie ===
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| Z tejto časti nemusíte mať obavy, programovanie je jednoduché a budeme využívať existujúce
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| programy s knižnicami, ktoré si len zľahka modifikujete pre svoje potreby.
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| * Programovací jazyk aj prostredie: [https://www.arduino.cc/ Arduino]
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| * Knižnica SevSeg: https://github.com/sparkfun/SevSeg
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| Ukážkové programy:
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| <source lang=c>
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| #include <SevSeg.h>
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| SevSeg MyDisp; //Instantiate a seven segment controller object
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| void setup()
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| {
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| byte numDigits = 4;
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| byte digitPins[] = {2, 3, 4, 5}; // Digits: 1,2,3,4
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| byte segmentPins[] = {6, 7, 8, 11, 12, 13, 14, 15}; // Segments: A,B,C,D,E,F,G,Period
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| MyDisp.begin(COMMON_ANODE, numDigits, digitPins, segmentPins);
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| MyDisp.setBrightness(80);
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| }
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| void loop()
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| {
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| MyDisp.setNumber(1234,9); // Second argument is decimal place
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| MyDisp.refreshDisplay(); // Must run repeatedly
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| }
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| </source>
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| <source lang="c">
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| #include "SevSeg.h"
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| SevSeg myDisplay;
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| #define FOUR_DIGITS 4
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| #define A1 2
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| #define A2 3
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| #define A3 4
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| #define A4 5
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| #define SegA 6
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| #define SegB 7
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| #define SegC 8
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| int value;
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| int oldvalue;
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| char tempString[5];
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|
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| //-------------------------------------------------------------------------------------------
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| void setup()
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| {
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| value = 0;
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| oldvalue = 0;
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| myDisplay.Begin(COMMON_ANODE, FOUR_DIGITS, A1, A2, A3, A4, SegA, SegB, SegC, 11, 12, 13, 14, 15);
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| myDisplay.SetBrightness(100); //Set the display to 100% brightness level
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| }
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| //-------------------------------------------------------------------------------------------
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| void loop()
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| {
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| value = analogRead(5); // measurement
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| value = (15*oldvalue + value)/16; // simple filter
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| sprintf(tempString, "%4d", (long)value, DEC); // create output string
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| myDisplay.DisplayString(tempString, 0); // display value on disp
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| oldvalue = value;
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| }
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| //-------------------------------------------------------------------------------------------
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| </source>
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| Rozličné neusporiadané linky:
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| * Animácia k 7seg displeju: http://www.uize.com/examples/seven-segment-display.html
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| * Nas displej:
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| ** Product page http://www.gme.sk/hd-m324rd-p512-924
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| ** Datasheet http://www.gme.sk/img/cache/doc/512/924/hd-m324rd-datasheet-1.pdf
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| * Schema zapojenia Arduino https://www.arduino.cc/en/uploads/Main/Arduino-Pro-schematic.pdf
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