2 layers22 × 34 mm
Key tap88
jmA500/Key-Tap
Key-Tap. Use keyboard hotkeys to configure internal hardware extensions in the Amiga 500.
13 parts10GPL-2.0
2 layers38 × 36 mm
Binaeruhr
timocramer/binaeruhr4binary pocket watch
- Size
- 38 × 36 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 33
- Nets
- 38
- Pads
- 91
- Tracks, vias
- 149, 12
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 4 Jul 2024
- Updated
- 4 Dec 2025
Overview
Binaeruhr is an open-source printed circuit board by timocramer, from the timocramer/binaeruhr repository on GitHub. It is a 2-layer board of 38 × 36 mm with 33 parts on 38 nets, routed with 149 tracks and 12 vias.
It is built around the ATMEGA48PA-AU. Its parts include 12 resistors, 10 diodes, 1 capacitor, 1 IC and 1 crystal. It belongs with the wearables boards and the AVR (ATmega, ATtiny) boards of this library.
Main components
1README
README.mdThis is a binary pocket watch, made with an atmega48pa. The enclosure is from a cheap pocket watch, mass produced in China and sold via Ebay or Aliexpress.
how to use the watch
reading the watch
Open the watch. The upper four LEDs show the hours in binary, the lower six ones show the minutes. Add the numbers under/over the glowing LEDs to get the current time. Closing the watch will turn the LEDs off again.
setting the watch
Press the button for at least 4 seconds (this is called a long press). After release the hour LEDs are blinking. Pressing the button for a short time will advance the hours. Another long press will enable you to set the minutes in the same way. Pressing the button for a long time in minute setting mode or closing the lid will reset the watch to count and show the time again.
build your own
Have a look at the construction manual if you want to build your own.
Parts
33| Qty | Value | Footprint | References |
|---|---|---|---|
| 10 | 470 | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R1, R2, R3, R4, R5, R6, R7, R8, R9, R10 |
| 10 | LED | LED_SMD:LED_0805_2012Metric_Pad1.15x1.40mm_HandSolder | D1, D2, D3, D4, D5, D6, D7, D8, D9, D10 |
| 2 | 1M | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R11, R12 |
| 1 | 100nF | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C1 |
| 1 | ATmega48PA-A | Package_QFP:TQFP-32_7x7mm_P0.8mm | U1 |
| 1 | Battery_Cell | Battery:BatteryHolder_Keystone_3002_1x2032 | BT1 |
| 1 | Crystal | Crystal:Crystal_SMD_MicroCrystal_MS1V-T1K | Y1 |
| 1 | Deckel | TestPoint:TestPoint_Pad_4.0x4.0mm | TP2 |
| 1 | Gehäuse | TestPoint:TestPoint_Pad_2.0x2.0mm | TP3 |
| 1 | MISO | TestPoint:TestPoint_Pad_1.0x1.0mm | TP5 |
| 1 | MOSI | TestPoint:TestPoint_Pad_1.0x1.0mm | TP4 |
| 1 | RESET | TestPoint:TestPoint_Pad_1.0x1.0mm | TP7 |
| 1 | SCK | TestPoint:TestPoint_Pad_1.0x1.0mm | TP6 |
| 1 | Taster | TestPoint:TestPoint_Pad_4.0x4.0mm | TP1 |
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Questions
How big is the Binaeruhr PCB?
It measures 38 × 36 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Binaeruhr use?
33 parts, built around the ATMEGA48PA-AU. 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 Binaeruhr KiCad files?
From the timocramer/binaeruhr repository on GitHub, at the commit this page was made from: the board is kicad/binaeruhr/binaeruhr.kicad_pcb and its schematic kicad/binaeruhr/binaeruhr.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Binaeruhr design in my own project?
Its repository states no licence, so its author keeps all rights: ask timocramer before reusing the design.