Najprościej wykonany układ DDS z popularnym modułem AD9850.
#include <Wire.h>
#include <EEPROM.h>
#include <LiquidCrystal_I2C.h>
#include <Encoder_Polling.h>
#include <AH_AD9850.h>
//************ PORTY ARDUINO******************
//porty dla DDS AD9850
#define AD9850_RESET 9
#define AD9850_BITDATA 8
#define AD9850_FQUP 7
#define AD9850_CLK 6
//porty dla ENCODER
#define ENCODER_SW 5
#define ENCODER_CLK 4
#define ENCODER_DT 3
//porty dla przycisków
#define BUTTON_1 12
#define BUTTON_2 11
#define BUTTON_3 10
#define BUTTON_4 A0
//port dla diod LED
#define LED 2
//pomiar napiecia
#define VOL A1
//////////////// OBIEKTY /////
//********** MODUL DDS *********************************
// definicja AH_AD9850(CLK, FQUP, BitData, RESET)
AH_AD9850 AD9850(AD9850_CLK, AD9850_FQUP, AD9850_BITDATA, AD9850_RESET);
#define LCD_I2C_ADDRESS 0x27
///LiquidCrystal_I2C(lcd_Addr,En,Rw,Rs,d4,d5,d6,d7,backlighPin,backlighPol);
LiquidCrystal_I2C lcd(LCD_I2C_ADDRESS, 2, 1, 0, 4, 5, 6, 7, 3, POSITIVE);
//Stałe
#define ROW_1 0
#define ROW_2 1
const long MIN_FREQ = 7000000; // Poczatek zakresu pasma 40 m
const long MAX_FREQ = 7200000; // Koniec zakresu pasma 40 m
const long DEF_FREQ = 7100000; // Domyśla częstotliwość pasma 40 m
const long OSCILATOR = 11998000; //Częstotliwość oscylatora BFO
const long MAX_STEP = 10000; //Maksymaly krok zmiany częstotliwości
const long MIN_STEP = 10; // Minimalny krok zmiany częstotliowsci
const int MIN_ARRAY_STEP = 0;
const int MAX_ARRAY_STEP = 9;
//Zmienne
long Freq = DEF_FREQ;
long Step = 10;
int Encoder_SW_state = HIGH;
long Freq_VFO=0;
int Is_display_freq = HIGH;
int Volty =0;
int Current_step = 0;
int Array_steps[]={10,25,50,100,250,500,1000,2500,5000,10000};
int scan_up = LOW;
int scan_down = LOW;
int scan = LOW;
//*******************************************************
void setup()
{
pinMode(BUTTON_1, INPUT);
pinMode(BUTTON_2, INPUT);
pinMode(BUTTON_3, INPUT);
pinMode(BUTTON_4, INPUT);
pinMode(ENCODER_SW, INPUT);
lcd.begin(16,2);
lcd.home();
lcd.print("* RADUINO 3.0 *");
lcd.setCursor(0,ROW_2);
lcd.print(" A.Sliwa SQ9TLA ");
delay(3000);
lcd.home ();
lcd.print("U: V,S: 10 Hz");
lcd.setCursor (0, ROW_2);
lcd.print("FERQ: MHz");
encoder_begin(ENCODER_DT,ENCODER_CLK);
Freq=DEF_FREQ;
}
//*******************************************************
void loop() {
//Oodczyt stanu przycisków
int button_1 = digitalRead(BUTTON_1);
int button_2 = digitalRead(BUTTON_2);
int button_3 = digitalRead(BUTTON_3);
int button_4 = digitalRead(BUTTON_4);
//Skanowanie pasma
if ((button_1 == HIGH) and (scan_up == LOW)) {
scan_down=LOW;
scan_up = HIGH;
}
if ((button_1 == HIGH) and (scan_up == HIGH)) {
scan_down=LOW;
scan_up = LOW;
}
if ((button_2 == HIGH) and (scan_down == LOW)) {
scan_down=HIGH;
scan_up = LOW;
}
if ((button_2 == HIGH) and (scan_down == HIGH)) {
scan_down=LOW;
scan_up = LOW;
}
if (scan_up == HIGH) {
Freq = Freq + Step;
delay(1000);
}
if (scan_down == HIGH) {
Freq = Freq - Step;
delay(1000);
}
//Zmiana freq od przycisków
if (button_3 == HIGH) Freq=Freq - 100;
if (button_4 == HIGH) Freq=Freq + 100;
//Obsługa enkodera
int dir = encoder_data();
Encoder_SW_state= digitalRead(ENCODER_SW);
//Zmiana kroku
if (Encoder_SW_state == LOW) {
if( dir > 0) {
if (Current_step < MAX_ARRAY_STEP) Current_step++;
}
if (dir < 0 ) {
if (Current_step > MIN_ARRAY_STEP) Current_step--;
}
}
//Zmiana częstotliwości
else {
if(dir > 0) {
Freq = Freq + Step;
}
if (dir <0 ) {
Freq = Freq - Step;
}
}
Step=Array_steps[Current_step];
//Ograniczniki dla pasm
if (Freq < MIN_FREQ) {
Freq = MIN_FREQ;
scan_down = LOW;
}
if (Freq > MAX_FREQ) {
Freq = MAX_FREQ;
scan_up = LOW;
}
//Wyswietlanie kroku na wyświetlaczu
if (Encoder_SW_state == LOW) {
if (Is_display_freq == HIGH) {
lcd.setCursor(0,ROW_2);
lcd.print("STEP: Hz");
Is_display_freq = LOW;
}
lcd.setCursor(6,ROW_2);
switch(Step) {
case 10000 : lcd.print(" 10000"); break;
case 5000 : lcd.print(" 5000"); break;
case 2500 : lcd.print(" 2500"); break;
case 1000 : lcd.print(" 1000"); break;
case 500 : lcd.print(" 500"); break;
case 250 : lcd.print(" 250"); break;
case 100 : lcd.print(" 100"); break;
case 50 : lcd.print(" 50"); break;
case 25 : lcd.print(" 25"); break;
case 10 : lcd.print(" 10"); break;
case 1 : lcd.print(" 1"); break;
}
lcd.setCursor(10,ROW_1);
switch(Step) {
case 10000 : lcd.print("10 kHz"); break;
case 5000 : lcd.print(" 5 kHz"); break;
case 2500 : lcd.print("2.5kHz"); break;
case 1000 : lcd.print(" 1 kHz"); break;
case 500 : lcd.print("500 Hz"); break;
case 250 : lcd.print("250 Hz"); break;
case 100 : lcd.print("100 Hz"); break;
case 50 : lcd.print(" 50 Hz"); break;
case 25 : lcd.print(" 25 Hz"); break;
case 10 : lcd.print(" 10 Hz"); break;
case 1 : lcd.print(" 1 HZ"); break;
}
}
else {
if (Is_display_freq == LOW) {
lcd.setCursor(0,ROW_2);
lcd.print("FERQ: MHz");
Is_display_freq = HIGH;
}
lcd.setCursor(6,ROW_2); lcd.print(Freq/10);
lcd.setCursor(5,ROW_2); lcd.print("7.");
}
//Obsługa DDS-a
Freq_VFO=OSCILATOR - Freq;
AD9850.set_frequency(Freq_VFO);
button_1 = LOW;
button_2 = LOW;
button_3 = LOW;
button_4 = LOW;
delay(100);
}