Filament Clock
Filament Clock
A stylish clock.
Features
- Digital Clock Display
- 25mm Digit Height
- Monochrome or Color HH:MM display
- 30mm Hour Filament Lamps
- Sweep Seconds Ring
- GPS Disciplined Timebase
- Automatic Brightness
- DST support
- Military time support
- NEO6M/7M and ATGM336 GPS support
Operation
Setting Switch
The switch selects which setting the buttons control.
Normally set the switch to UTC Hours Offset and then adjust the clock time so it's correct for your location.
Then set the switch to Brightness Adjust and trim the automatic brightness to your liking.
Up/Down Buttons
These buttons change the UTC Hours Offset or Brightnes depending on the setting switch.
Press and hold a button, the value will change once per second.
DST and Military Time Options
These settings are jumpers on the control board.
Automatic Color Change
The clock colors (HH:MM and sweep seconds) will automatically
change to a random color at midnight.
GPS Lock Status
The colon LEDs indicate the GPS receiver status.
- Missing = no GPS signal (this is normal at power on)
- Blinking = receiving signal but GPS lock not achieved yet
- Solid = GPS locked on
GPS Error Indication
The degrees LED indicates GPS message squelch failure.
This is just a warning and the clock continues to operate;
it indicates the GPS is an unknown model or is not responding correctly.
Display Elements
Digital Time Display
The displays come from clock kits found on AliExpress.
The monochrome or color versions may be used. The color version can display 7 different colors.
Sweep Seconds Ring
These are "Side Emitting 5V 4mm 144 leds/m", found on AliExpress.
Hour Filament Lamps
These are 38mm 3V ceramic filament LEDs, available in several colors.
They are brittle and easy to break.
The LED length is 30mm, with 4mm leads on each end, so it's sold as "38mm filament".
Specifications
- Power supply: 5V <500mA
- Dimensions: 250mm x 35mm
Design Documents
| Schematic Diagram | Filament Clock Schematic.pdf |
| Bill of Material | Filament Clock BOM.pdf |
| PCB Gerbers | gerbers_P217.zip |
| 3D Print Files | Filament Clock 3D Print Files.zip |
| Arduino Source Folder | Arduino.zip |
| Arduino Main Code | Arduino.ino.txt |
Build Pictures
Faceplate
9" Acrylic Crystal
Spacer Ring
Spring Ring
Outer Ring
Back
Back Inside
Base
Bare Printed Circuit Board, including the switch board
Control Circuit Board
