

Flux Capacitor Micro Pin Badge
A tiny (36mm x 29mm) pin badge and keychain PCB version of Flux Capacitor featuring 25 animated LEDs that animate to create the “fluxxing” effect.
- Size
- 29 × 36 mm
- Copper layers
- 2
- Thickness
- 0.8 mm
- Parts
- 48
- Nets
- 21
- Pads
- 181
- Tracks, vias
- 444, 18
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 6 (file 20211014)
- Created
- 6 Sep 2022
- Updated
- 29 Sep 2022
Overview
Flux Capacitor Micro Pin Badge is an open-source printed circuit board by hojadurdy, from the hojadurdy/Flux_Capacitor_Micro repository on GitHub. It is a 2-layer board of 29 × 36 mm with 48 parts on 21 nets, routed with 444 tracks and 18 vias.
It is built around the ATTINY1616-MN, CR2032 and TL 8. Its parts include 25 diodes, 5 resistors, 3 capacitors, 2 switches and 1 IC. It belongs with the lEDs and displays boards and the AVR (ATmega, ATtiny) boards of this library.
Main components
3ATTINY1616-MN
QFN-20-EP(3x3)-40℃~+105℃ 1.8V~5.5V 10bit 16KB 18 20MHz 256Byte 2KB 8 Bit 8bit AVR Built-in FLASH QFN-20-EP(3x3) Microcontrollers (MCU/MPU/SOC) ROHSMicrochip TechnologyMicrocontrollers (MCU/MPU/SOC)CR2032
-- Unclassified goods ROHSMaxellUncategorisedTL 8
-Banana Connectors / Alligator ClipsB&K Precision
README
README.mdFlux Capacitor Micro
WHAT IS IT?
A tiny (36mm x 29mm) pin badge and keychain PCB version of Flux Capacitor featuring 25 animated LEDs that animate to create the “fluxxing” effect. It’s 100% decorative, it doesn’t actually let you travel through time when worn around the neck.
This tiny Flux Capacitor is controlled by a Microchip ATtiny1616 microcontroller. Thankfully this board has a much lower power requirement than the silkscreen indicates on the back, and skips along, sipping power from the single CR2016/LIR2016 coin cell battery (instead of plutonium or a lightning strike), slipped into the rear mounted coin cell holder. By using PWM (Pulse Width Modulation) pins for 8 channels of 3 paralleled LEDs, different animation patterns are generated for the fluxxxing effect. In settings mode, users are able change between 8 different animation, speed and LED brightness.
WHAT IS NEW WITH THIS DESIGN?
- Main difference is the new design significantly slimmer due to slim battery holder and changing PCB thickness from 1.6mm to 0.8mm. Older design (V3) had a thickness of 6.15mm, the new design is only 3.4mm thick.
- Front design has been updated to look like similar to Flux Capacitor Mini design.
- A much brighter center LED has been added to get a brighter center beam flash, similar to the original Flux Capacitor.
- Instead of just 2 animations, now there are 8 different animations that can be selected in settings.
- Power toggle switch has been replaced with a push button. When pressed device goes in do "Power Down" mode. during "Power Down" mode device only consumes 0.5 uA.
Below you can see the thickness comparison of V3 on the left and V4 on the right.

HOW LONG WILL THE BATTERY LAST?
CR2016 (Non-Rechargeable) with average of 90 mAh battery capacity.
- 100% LED Brightness : 80 Hours
- 25% LED Brightness : 128 Hours
LIR2016 (Rechargeable) with average of 20 mAh battery capacity.
- 100% LED Brightness : 18 Hours
- 25% LED Brightness : 28 Hours
HOW TO SETUP AND OPERATE
To begin with, turn on the device by pressing power button. In order to enter settings mode just hold the set button for 1 second. If all of the LEDs flashes twice, you are successfully entered settings mode.

After the LEDs flash you will see that only single LED remains on. That single LED shows which animation is selected. To change that, just short press the set button and the LED should start shifting from inner to outer LED with each press. After selecting the preferred animation, hold the set button for 1 second to save. LEDs should flash twice to confirm.
Next setting is animation speed. To change the animation speed, just short press the set button to increase the speed. LEDs will turn on from inner to outer to indicate animation speed. At maximum speed all LEDs should be on. Hold the set button for 1 second to save animation speed. LEDs should flash twice to confirm.
Last setting is LED brightness. Same as before to change the brightness just short press the set buttonto increase the brightness. LEDs will turn on from inner to outer to indicate brightness level. At maximum brightness all LEDs should be on. Hold the set button for 1 second to save brightness setting. LEDs should flash twice to confirm and device should exit the setting mode. LEDs should start animating.
If you short press the button with gear icon during normal operation, device initiates engage mode. LEDs start to animate faster with much brighter center beam as shown in the video below.
P.S.
Only CR2016 or LIR2016 batteries are compatible. If you prefer to use larger CR2032 or LIR2032 batteries, message me from store page. I will change the battery holder to a larger one. Also batteries are not included due to shipping restrictions.
Parts
48| Qty | Value | Footprint | References |
|---|---|---|---|
| 7 | LOGO | LOGO | G***, G***, G***, G***, G***, G***, G*** |
| 3 | 100nF | HDMod_Capacitor_SMD:C_0402_1005Metric | C1, C2, C3 |
| 2 | 10K | HDMod_Resistor_SMD:R_0402_1005Metric | R2, R3 |
| 2 | 510 | HDMod_Resistor_SMD:R_0402_1005Metric | R1, R4 |
| 1 | 0 | HDMod_Resistor_SMD:R_0402_1005Metric | R5 |
| 1 | ATtiny1616-M | HDMod_Package_DFN_QFN:VQFN-20-1EP_3x3mm_P0.4mm_EP1.7x1.7mm | U1 |
| 1 | BM1 | HDMod_LED_SMD:LED_0402_1005Metric | D21 |
| 1 | BM2 | HDMod_LED_SMD:LED_0402_1005Metric | D22 |
| 1 | BM3 | HDMod_LED_SMD:LED_0402_1005Metric | D23 |
| 1 | BM4 | HDMod_LED_SMD:LED_0402_1005Metric | D24 |
| 1 | BM5 | HDMod_LED_SMD:LED_0402_1005Metric | D25 |
| 1 | BM6 | HDMod_LED_SMD:LED_0402_1005Metric | D26 |
| 1 | BM7 | HDMod_LED_SMD:LED_0402_1005Metric | D27 |
| 1 | BM8 | HDMod_LED_SMD:LED_0402_1005Metric | D28 |
| 1 | CR2032 | HDMod_Battery_Holder_SMD:MY-2016-02 | BT1 |
| 1 | Flash | HDMod_LED_SMD:LED_0402_1005Metric | D1 |
| 1 | G*** | svg2mod | svg2mod |
| 1 | G*** | kibuzzard-63026A3F | kibuzzard-63026A3F |
| 1 | On/Off | HDMod_Switch_SMD:K2-1809SN-D4DW-06 | SW1 |
| 1 | Set | HDMod_Switch_SMD:K2-1809SN-D4DW-06 | SW2 |
| 1 | TL1 | HDMod_LED_SMD:LED_0402_1005Metric | D11 |
| 1 | TL2 | HDMod_LED_SMD:LED_0402_1005Metric | D12 |
| 1 | TL3 | HDMod_LED_SMD:LED_0402_1005Metric | D13 |
| 1 | TL4 | HDMod_LED_SMD:LED_0402_1005Metric | D14 |
| 1 | TL5 | HDMod_LED_SMD:LED_0402_1005Metric | D15 |
| 1 | TL6 | HDMod_LED_SMD:LED_0402_1005Metric | D16 |
| 1 | TL7 | HDMod_LED_SMD:LED_0402_1005Metric | D17 |
| 1 | TL8 | HDMod_LED_SMD:LED_0402_1005Metric | D18 |
| 1 | TR1 | HDMod_LED_SMD:LED_0402_1005Metric | D31 |
| 1 | TR2 | HDMod_LED_SMD:LED_0402_1005Metric | D32 |
| 1 | TR3 | HDMod_LED_SMD:LED_0402_1005Metric | D33 |
| 1 | TR4 | HDMod_LED_SMD:LED_0402_1005Metric | D34 |
| 1 | TR5 | HDMod_LED_SMD:LED_0402_1005Metric | D35 |
| 1 | TR6 | HDMod_LED_SMD:LED_0402_1005Metric | D36 |
| 1 | TR7 | HDMod_LED_SMD:LED_0402_1005Metric | D37 |
| 1 | TR8 | HDMod_LED_SMD:LED_0402_1005Metric | D38 |
| 1 | UPDI_PAD | HDMod_Testing_and_Programming_PAD:PogoPad_1x03_P1.27mm | J1 |
The 47 most common of 48 parts.
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Questions
How big is the Flux Capacitor Micro Pin Badge PCB?
It measures 29 × 36 mm and has 2 copper layers, 0.8 mm thick.
What parts does the Flux Capacitor Micro Pin Badge use?
48 parts, built around the ATTINY1616-MN, CR2032 and TL 8. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Flux Capacitor Micro Pin Badge KiCad files?
From the hojadurdy/Flux_Capacitor_Micro repository on GitHub, at the commit this page was made from: the board is PCB/Flux_Capacitor_Micro_Pin_Badge.kicad_pcb and its schematic PCB/Flux_Capacitor_Micro.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Flux Capacitor Micro Pin Badge design in my own project?
Its repository states no licence, so its author keeps all rights: ask hojadurdy before reusing the design.
