使用Arduino开发板自制波形发生器

参考链接

使用Arduino制作多种波形发生器

制作教程

PWM教程

中断

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#include <PWM.h> #include <LiquidCrystal.h> const int rs=14, en=15, d4=10, d5=11, d6=8, d7=7; LiquidCrystal lcd(rs, en, 16,d4, d5, d6, d7);//Mention the pin number for LCD 1602 connection   int Encoder_OutputA = 18; int Encoder_OutputB = 19; int Encoder_Switch =17; int Previous_Output; int multiplier = 1;   double angle =0 ; double increment =0.2; const int signal_pin = 9; const int Sine_Pin = 5; int32_t frequency;//frequency to be set int32_t lower_level_freq = 1;//lowest possible freq value is 1Hz   int32_t upper_level_freq = 10000;//Maximum possible freq is 100KHz     void setup() {   lcd.begin(16,2);   lcd.print("Signal Generator");//Intro Message line1   lcd.setCursor(0,1);   lcd.print("Circuit digital");// Message line2   delay(2000);   lcd.clear();   lcd.print("Freq:00000Hz");   lcd.setCursor(0,1);   lcd.print("Inc. by: 1Hz");   Serial.begin(9600);   InitTimersSafe();//Initialize timers without disturbing timer 0   pinMode(Encoder_OutputA,INPUT);   pinMode(Encoder_OutputB,INPUT);   pinMode(Encoder_Switch,INPUT);   Previous_Output=digitalRead(Encoder_OutputA);//Read the inital value of Output A   attachInterrupt(0,generate_sine,CHANGE); } void loop() {   if (digitalRead(Encoder_OutputA)!=Previous_Output)   {     if (digitalRead(Encoder_OutputB)!=Previous_Output)     {       frequency = frequency + multiplier;       Serial.println(frequency);       SetPinFrequencySafe(signal_pin,frequency);       pwmWriteHR(signal_pin,32768);//Set duty cycle to 50% by default -> for 16-bit 65536/2 = 32768      //  pwmWrite(signal_pin,128);//Set duty 50%(0-255)       lcd.setCursor(0, 0);       lcd.print("Freq:     Hz");       lcd.setCursor(5, 0);       lcd.print(frequency);               }     else     {       frequency = frequency - multiplier;       Serial.println(frequency);       SetPinFrequencySafe(signal_pin,frequency);       pwmWriteHR(signal_pin, 32768);       // pwmWrite(signal_pin,128);       lcd.setCursor(0, 0);       lcd.print("Freq:     Hz");       lcd.setCursor(5, 0);       lcd.print(frequency);       }     }     if(digitalRead(Encoder_Switch)==0)     {       multiplier = multiplier * 10;       if(multiplier>1000)          multiplier=1;       Serial.println(multiplier);       lcd.setCursor(0,1);       lcd.print("Cng. by:     ");       lcd.setCursor(8,1);       lcd.print(multiplier);       delay(500);       while(digitalRead(Encoder_Switch)==0);       }      Previous_Output = digitalRead(Encoder_OutputA);  }       void generate_sine() {   double sineValue = sin(angle);    sineValue *= 255;    int plot = map(sineValue, -255, +255, 0, 255);    Serial.println(plot);    analogWrite(Sine_Pin,plot);    angle += increment;      if (angle > 180)    angle =0;     }