Project Logs

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• Cover

  Ben Mo • 01/02/2021 at 09:16 • 0 comments

  I've designed and made a cover for VFD watch...

• Parts come together

  Ben Mo • 12/31/2020 at 09:30 • 0 comments

• Breakout Board Connector

  Ben Mo • 12/31/2020 at 08:25 • 0 comments

  Unfortunately i couldn't find a suitable connector for my purpose...So i decided to make it.

  I ordered some Nokia 3110 battery connector to extract their flexible pins.These pins have the exact height that i need.

  Also, I soldered M3 brass insert nuts as on-board spacer to avoid using extra screws when i'll assemble the parts

• Programming Time

  Ben Mo • 12/31/2020 at 07:43 • 0 comments

• VFD Controller Board

  Ben Mo • 12/28/2020 at 20:51 • 0 comments

  This is the controller board that has a DS3231 RTC chip , an Attiny167 microcontroller , a Buzzer and some other component...

• VFD breakout board

  Ben Mo • 12/24/2020 at 18:06 • 0 comments

  I've designed this board for my VFD. it consists of a boost converter based on MT3608 , AC voltage provider with ATTiny13 microcontroller , ULN2803 and 74HC595 ICs to control all grids and segments with 3 pins and also has two ws2812b RGB led as backlight especially used in alarm clock feature.

• VFD controling method

  Ben Mo • 12/24/2020 at 16:19 • 0 comments

  I used combination of ULN2803 and 74HC595 to control all VFD just using 3 pins.

• MT3608 & ATTiny13 test PCB

  Ben Mo • 12/24/2020 at 15:57 • 0 comments

  Testing boost voltage circuit with fixed output voltage also program and test Attiny13 to provide a 5v ac voltage for VFD filament.

• Filament AC voltage

  Ben Mo • 12/24/2020 at 15:51 • 0 comments

  For filament we can use DC or AC voltage but AC has superiority over DC. If the filament is driven with a DC voltage there will be a voltage gradient across its length. This means the end of the display with the more positive filament voltage will have less of a differential to the anodes, and thus will be dimmer than the negative end of the filament due to the potential gradient effect.

  http://insanity4004.blogspot.com/2017/03/p170-dh-vacuum-flourescent-display.html
  

  https://www.qsl.net/m0ayf/VFD-Regen.html
  

  to producing AC voltage i decided to use a microcontroller, in this case i choose an Attiny13 .

  for achieving a 5v 60hz ac voltage i programmed two pins of Attiny13 as output and switching them on/off respectively with a 8 milliseconds delay.

  void setup() {
  
    pinMode(0, OUTPUT);
    pinMode(1, OUTPUT);
  
  }
  
  void loop() {
    digitalWrite(0, HIGH);
    digitalWrite(1, LOW);
    delay(8);
    digitalWrite(0, LOW);
    digitalWrite(1, HIGH);
    delay(8);
  }

• MT3608 circuit test pcb

  Ben Mo • 12/24/2020 at 14:22 • 0 comments

  It works fine and boost 5v up to 28v

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