Show page

Differences

This shows you the differences between two versions of the page.

--- pm:prj2022:sgherman:guitar_pedal [2022/05/31 20:30]
cristina.grigore00 [Rezultate Obţinute]
+++ pm:prj2022:sgherman:guitar_pedal [2022/06/02 01:52] (current)
cristina.grigore00 [Bibliografie/Resurse]
@@ Line 49: / Line 49: @@
 </note>
+===== Setup =====
+In etapa de setup, configurez Timer-ul 0 si Timer-ul 2 pe fastPWM 8-bit inverting, prescaler 2. Configurez ADC-ul: tensiunea de referinta la 1.1V si prescaler-ul la 32.
+<code>
+void waveformGenerationMode(int pin) {
+  int timer = getTimer(pin); //select Timer 2/0
+  //setting the waveform generation mode bits WGM to 011 selects fast PWM
+  int wgm = B011;
+  //set WGM2:0 = 3 so that counter counts to 0xFF instead of OCR0A
+  if(timer == 0) {
+    TCCR0B &= ~(B1 << 3); // clear WGM02
+    TCCR0A &= ~B11; // clear WGM01 and WGM00
+    TCCR0A |= wgm; // set WGM01 and WGM00
+  } else if(timer == 2) {
+    TCCR2B &= ~(B1 << 3); // clear WGM23
+    TCCR2A &= ~B11; // clear WGM21 and WGM20
+    TCCR2A |= wgm; // set WGM21 and WGM20
+  }
+}
+</code>
+<code>
+ analogReference(INTERNAL);
+  //set the ADC's prescaler to a low value (32)
+  ADCSRA &= ~B111; // clear analog prescale
+  ADCSRA |= B101;
+  </code>
+===== Input Switch =====
+Pentru citirea input-ului de la utilizator citesc valoarea de pe pinul A2 pentru pozitia switch-ului rotativ si obtin o valoare discreta(variabila ''mode''). pentru fiecare dintre cele 9 pozitii, desi am ales sa implementez doar 2 efecte pentru 2 pozitii din considerente de lipsa de memorie.\\ Variabila ''fx'' contine inputul de pe potentiometrul P1 ce ajusteaza intensitatea efectului.
+<code>
+void readKnobs(){
+    mode = analogRead(2);
+    //dividing by 75 ensures proper discrete values
+    //for if statements above
+    mode = mode / 75;
+    fx = analogRead(3);
+}
+</code>
+===== Efecte =====
+Am ales sa implementez 2 efecte: un delay si un bitcrusher.
+<code>
+    // ***************
+    // ***Overdrive***
+    // ***************
+    if(mode == 13){
+      value50 = 1 + ((float) fx / (float) 20);
+      byte input = analogRead(left);
+      input = (input * value50);
+      output(input);
+    }
+</code>
+<code>
+    // *************
+    // ***bitcrush**
+    // *************
+    if(mode == 6){
+      value300 = 1 + ((float) fx / (float) 3);
+      if(delayed > value300) {
+        byte input = analogRead(left);
+        input = (input >> 6 << 6);
+        output(left, input);
+        delayed = 0;
+       }
+       delayed++;
+    }
+    </code>
 ===== Rezultate Obţinute =====
-{{:pm:prj2022:sgherman:guitar.jpg?nolink&400 |}}\\ {{:pm:prj2022:sgherman:img_20220531_190638.jpg?nolink&500 |}}\\ {{:pm:prj2022:sgherman:img_20220531_190828.jpg?nolink&500 |}}
+{{:pm:prj2022:sgherman:guitar.jpg?nolink&400 |}}\\ {{:pm:prj2022:sgherman:img_20220531_190638.jpg?nolink&700 |}}\\ {{:pm:prj2022:sgherman:img_20220531_190828.jpg?nolink&700 |}}
 ===== Concluzii =====
@@ Line 58: / Line 129: @@
 ===== Download =====
-<note tip>
-</note>
+{{:pm:prj2022:sgherman:arduino_guitar_pedal.zip|}}
 ===== Jurnal =====
@@ Line 70: / Line 142: @@
 <note>
-[[https://www.instructables.com/Arduino-Guitar-Pedal/]]
+[[https://www.instructables.com/Arduino-Guitar-Pedal/]]\\ [[https://www.electrosmash.com/pedalshield-uno]]
-[[https://www.electrosmash.com/pedalshield-uno]]
 </note>
-<html><a class="media mediafile mf_pdf" href="?do=export_pdf">Export to PDF</a></html>
+{{:pm:prj2022:sgherman:arduino_guitar_pedal_1_.pdf|}}