Arduino_Noritake_VFD_GU7000.zip doesn't work for me. I'm wondering if there isn't a problem with changes to the arduino code. The code used to work and I had a hard time getting it to do so but once it worked, it worked. I recently lost a hard drive and had to re-install my os and the code no longer works. I've spent the better part of two days trying to get this vfd to output anything along the lines of text or graphics to no avail. None of the sample code works, none of my own code works. There seems to be a communication problem but I can't for the life of me figure out what it is. Edit: It turns out the the fault lies with arduino after all. The default shipped avr-gcc is out of date or incompatible. On archlinux at least the fix is easy enough: [CODE]
Install avr-gcc with pacman (not an AUR version) and do the following.

# cd /usr/share/arduino/hardware/tools/avr/bin
# mv ./avr-gcc ./avr-gcc-backup
# ln -s /usr/bin/avr-gcc ./[/CODE] [CODE]#include 
#include 
#include 

GU7000_Serial_Async interface(38400, 2, 3, 4); // BAUD,SIN,BUSY,RESET

const long scaleConst = 1184.665 * 1000;       // internalRef * 1023 * 1000;
long readVcc() {
  // Read 1.1V reference against AVcc
  // set the reference to Vcc and the measurement to the internal 1.1V reference
  ADMUX = _BV(REFS0) | _BV(MUX3) | _BV(MUX2) | _BV(MUX1);
  delay(2);                                    // Wait for Vref to settle
  ADCSRA |= _BV(ADSC);                         // Start conversion
  while (bit_is_set(ADCSRA,ADSC));             // measuring
  uint8_t low  = ADCL;                         // must read ADCL first - it then locks ADCH 
  uint8_t high = ADCH;                         // unlocks both
  long result = (high<<8) | low;
  result = scaleConst / result;                // Calculate Vcc (in mV); 1125300 = 1.1*1023*1000
  return (int)result;                          // Vcc in millivolts
}

Noritake_VFD_GU7000 vfd;
void setup() {
  vfd.begin(140, 32);                          // 140x32 module
  vfd.interface(interface);                    // select which interface to use
  vfd.isModelClass(7000);                      // select display model
  vfd.GU7000_reset();                          // reset module
  vfd.GU7000_init();                           // initialize module
  _delay_ms(300);                              // wait for device to power up
  
}

void printVoltage(){
  int mv = readVcc();
  vfd.GU7000_setFontSize(3, 2, true);
  vfd.GU7000_setFontStyle(false, true);
  vfd.GU7000_clearScreen();                    // little bit of flickering going on
  vfd.print( mv / 1000, DEC );                 // print the integer value of the voltage  
  vfd.print('.');                              // print the decimal place
  vfd.print( mv % 1000, DEC );                 // print the rest of the voltage in millivolts
  vfd.GU7000_lineFeed();                       // start new line
  vfd.GU7000_carriageReturn();                 // return to the left
  vfd.print('Volts');
}

void loop() {
  printVoltage();
  _delay_ms(300);
}[/CODE]