HardLabs

BerlinUhr

designer2k2·BerlinUhr·Berlin_Uhr/Berlin_Uhr.kicad_pcb

BerlinUhr PCB layout, top view — open source AVR/Arduino board by designer2k2
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About the BerlinUhr PCB

BerlinUhr is an open source AVR/Arduino PCB design by designer2k2, published on GitHub under the GPL-3.0 license. It is a 2-layer board measuring 100 × 130.1 mm, with 53 components from 20 distinct parts.

Its main chip is the ATtiny167-SU, from the AVR/Arduino family. Other key parts include the DS3231M and TLC5947DAP. By type, the board carries 26 diodes, 10 resistors, 7 capacitors, 3 ICs, 2 connectors and 2 switches.

It belongs with the retro computing designs in this gallery.

From the project

Berlin Uhr or Mengenlehreuhr, a fancy retro style clock

The BerlinUhr is a standalone PCB with all the needed parts on it, just connect power over the USB-C and it will run.

The ATtiny167 receives the actual time from the DS3231 real time clock chip. Then displays it with 24 leds driven by the TLC5947. The brightness is adopted by measuring the ambient light with a KPS-3227.pdf).

1. PCB, source it with the gerbers: https://github.com/designer2k2/BerlinUhr/tree/main/BerlinUhr/gerber 2. Schematic: https://github.com/designer2k2/BerlinUhr/blob/main/BerlinUhr/Schematic.pdf 3. BOM, interactive BOM here…

BerlinUhr, from the project README
From the project README

Main components on the BerlinUhr

DS3231MATtiny167-SUTLC5947DAP

BerlinUhr bill of materials (BOM)

53 components, 20 distinct parts.

QtyPartRefs
1
DS3231M
U1
1
ATtiny167-SU
U2
1
TLC5947DAP
U3
1
KPS-3227
Q1
1
16MHz
Y1
1
USB_C_Receptacle_USB2.0
J1
1
ISP
J2
1
CR1216
BT1
2
SW_Push
SW1, SW2
2
BZT52Bxx
D1, D2
24
LED
D3, D4, D5, D6, D7, D8, D9, D10 +16
4
100nF
C1, C2, C3, C5
2
22p
C4, C6
1
10uF
C7
1
1.5k
R1
2
66.5R
R2, R3
3
10k
R4, R8, R10
1
3.3k
R5
2
5.1k
R6, R7
1
51k
R9

BerlinUhr design files

The KiCad project lives in the designer2k2/BerlinUhr repository on GitHub; these links point at the commit this page was built from.

BerlinUhr: common questions

What microcontroller does the BerlinUhr use?

The BerlinUhr is built around the ATtiny167-SU, from the AVR/Arduino family.

How big is the BerlinUhr PCB?

The BerlinUhr measures 100 × 130.1 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the BerlinUhr?

53 components, from 20 distinct parts. The full bill of materials is listed on this page.

Where can I download the BerlinUhr design files?

From the designer2k2/BerlinUhr repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the BerlinUhr design in my own project?

Yes, under the terms of its GPL-3.0 license, which designer2k2 chose for the repository.

Can I test firmware for the BerlinUhr without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug AVR/Arduino firmware against it before you order a PCB.

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