ReflowController/Software/sketch_hardware_test/sketch_hardware_test.ino

#include <Arduino.h>
#include <U8g2lib.h>
#include <Encoder.h>

#ifdef U8X8_HAVE_HW_SPI
#include <SPI.h>
#endif
#ifdef U8X8_HAVE_HW_I2C
#include <Wire.h>
#endif

U8G2_ST7920_128X64_1_HW_SPI u8g2(U8G2_R0, /* CS=*/ 10, /* reset=*/ 8);

Encoder rotEncoder(2, 3);

const int buzzer = 5;

void setup(void) {
  Serial.begin(9600);
  Serial.println("Hardware Test:");

  pinMode(buzzer, OUTPUT);

  u8g2.begin();  

  Serial.println("Buzzer Test");
  tone(buzzer, 1000, 5000);
  Serial.println("Buzzer Test");
  delay(1000);
  Serial.println("Buzzer Test 2");
  delay(1000);
  Serial.println("Buzzer Test 3");
}

long EncPos = 0;

void loop(void) {
  long newEncPos;
  newEncPos = rotEncoder.read();

  if (newEncPos != EncPos) {
    Serial.print("Encoder position = ");
    Serial.print(newEncPos);
    Serial.println();
    EncPos = newEncPos;
  }
  
  u8g2.firstPage();
  do {
    u8g2.setFont(u8g2_font_ncenB10_tr);
    u8g2.drawStr(0,24,"Hello World!");
  } while ( u8g2.nextPage() );
  //delay(1000);
}