LumiClock
Introduction: LumiClock
This is a clock based project. The title of which embodies the main means of displaying the time.
The "Lumi", being an abbreviation for Luminous.
Utilising lumious paper in conjunction with UV LED's to display the time which fades over a period of time between updates.
For a bit of added nostalgia, the numbers are in a dot matrix format.
In addition to luminous paper and UV LED's the clock uses a Microbit, RTC, Digital Logic, 3D printing and Mechanical parts.
Supplies
Microbit
Compact All in One Robotics Board
DS3231 RTC
Resistor 2k2 - Qty 2
Resistor 10k - Qty 2
Resistors 220R - Qty 8
Capacitor 100nF MLC - Qty 3
74HC541 Octal Buffer IC
Micro Metal DC motor
Motor connector Shim
UV LED's 5mm - Qty 8
Pinbetween
Hall sensors - Qty 2
Micro USB breakout
Momentary contact push button (SPST) - Qty 2
Push button (on/off) switch
Toggle switch
Terminal Posts - Qty 9
Jumper Jerky F/F 185mm
Jumper Jerky Junior F/F 100mm
Jumper Jerky Junior M/M 100mm
3d Printer
Filament
Luminous Paper
Clear Laminating Sheet, Clear sticky back plastic or A4 pocket sleeves.
20pin DIL IC socket
Stripboard
Ball magnets 3mm - Qty 2
Stainless steel tubes 30cm(L) X 6mm(Dia.) - Qty 2
M4 threaded rod 32cm long - Qty 2
M4 threaded rod 34cm long
Flanged Bearings 8mm OD x 4mm ID - Qty 2
Hex standoffs M4 x 5mm - Qty 3
M4 nuts - Qty 5
Hex standoffs M3 X 5mm - Qty 4
Hex standoffs M3 X 10mm+6mm - Qty 2
Hex standoffs M3 X 10mm
Hex standoffs M3 X 25mm - Qty 6
Bolts M3 x 12mm - Qty 24
Bolts M3 x 10mm - Qty 2
Bolts M3 x 16mm
M3 nuts - Qty 8
Countersunk Bolt M3 x 12mm
Screws M2 x 8mm self tapping - Qty 2
Grub Screw M4 x 6mm
Pin Header right angle 22 pins
3 pin terminal block, 2.54mm pitch - Qty 2
Acrylic Sheet 24cm (W) x 40cm (L) x 5mm (D) - Qty 2
Spring (Compression) 10mm free length x 5mm dia.x 0.5mm wire
May prove more cost effective to buy a range of values rather than individual values unless you already have them available. Some components may also have a MOL greater than the quantity specified in the component list.
No affiliation to any of the suppliers used in this project, feel free to use your preferred suppliers and substitute the elements were appropriate to your own preference or subject to supply.
Links valid at the time of publication.
2mm drill bit
3mm drill bit
6mm drill bit
7mm drill bit
Drill
Saw
Clamps
Ruler
Combination Square
Allen Keys
Pliers
Soldering Iron
Solder
Sanding paper
Know your tools and follow the recommended operational procedures and be sure to wear the appropriate PPE.
Step 1: Principle
This project makes use of Photo Luminescence using paper layered with Strontium Aluminate which has a green glow although different mixes can result in different colours and persistence.
Once charged, light from the paper will continue to be emitted after the charging light has been remove. 134
The charging light in this case comes from UVA LEDs.
The light emitted after charging is initially very bright but quickly decays to a lower intensity becoming further deminished over time, this persistance can last for several hours. if the paper is exposed multiple times in relatively quick succession then multiple ghost images will be present. Therefore, to minimise this effect a delay is applied between successive exposures.
Consequently, this project is best viewed in a low light environment.
Step 2: Mechanics
UV LED's are used to illuminate luminous paper but require some means of moving the LED's over the paper to create the numbers.
This is achieved by using a single (x axis), leadscrew.
The leadscrew is directly driven by a DC motor which can rotate clockwise and anti-clockwise. 538