2 layers110 × 99.6 mm
PCIce
ZoidTechnology/PCIce
A PCI Express card with an inbuilt PWM fan controller and mounting points for an 80mm fan.
22 parts90GPL-3.0
2 layers70 × 50.1 mm
Doom clock
stecman/avr-doomclock5GPS clock on an ATTiny with MAX7219 7-segment driver
- Size
- 70 × 50.1 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 24
- Nets
- 29
- Pads
- 94
- Tracks, vias
- 217, 11
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 4 Feb 2019
- Updated
- 26 Jul 2021
Overview
Doom clock is an open-source printed circuit board by stecman, from the stecman/avr-doomclock repository on GitHub, published under the MIT licence. It is a 2-layer board of 70 × 50.1 mm with 24 parts on 29 nets, routed with 217 tracks and 11 vias.
It is built around the ATTINY13A-SU and MAX7219M. Its parts include 7 resistors, 5 connectors, 4 capacitors, 3 switches and 2 ICs. It belongs with the lEDs and displays boards and the AVR (ATmega, ATtiny) boards of this library.
Main components
2
ATTINY13A-SU
SOIC-8-208mil-40℃~+85℃ 1.8V~5.5V 10bit 1KB 20MHz 6 64Byte 64Byte 8 Bit AVR Built-in FLASH SOIC-8-208mil Microcontrollers (MCU/MPU/SOC) ROHSMicrochip TechnologyMicrocontrollers (MCU/MPU/SOC)
MAX7219M
SOP-24-300mil10MHz 150uA 3-Wire Serial Interface 30mA 320mA 4V~5.5V 8 Segment x 8 Digit Built-in display RAM、PWM dimming、BCD input latch function、Power-up display blanking、Lamp test function、Cascadable function SOP-24-300mil Digital Tube Drivers ROHSHGSEMIDigital Tube Drivers
README
README.mdTiny GPS Clock
This is a hh:mm:ss clock that runs from the time contained in NMEA RMC sentences.
The code is targeted at an Atmel ATTiny13A.
Notes:
-
As the target microcontroller doesn't have enough RAM to store a full NMEA sentence, this project uses a custom parser that only reads RMC ("Recommended Minimum") sentences from a UART and extracts the time from that (see
nmea.c). -
The ATTiny13A lacks SPI and UART peripherals, so these are implemented in software.
Schematic and construction details can be found on this project's hackaday.io page.
Building and flashing
The avr-gcc toolchain is required to build, but there are no other external dependencies.
# Build
make
# Flash with programmer configured in Makefile
make flashTesting
The simple test suite for NMEA RMC sentence decoding can be run manually with:
make testParts
24| Qty | Value | Footprint | References |
|---|---|---|---|
| 3 | 10K | Resistor_SMD:R_1206_3216Metric_Pad1.42x1.75mm_HandSolder | R1, R6, R7 |
| 2 | 10uF | Capacitor_SMD:C_1206_3216Metric_Pad1.42x1.75mm_HandSolder | C1, C4 |
| 2 | 1uF | Capacitor_SMD:C_1206_3216Metric_Pad1.42x1.75mm_HandSolder | C2, C3 |
| 1 | 20K | Resistor_SMD:R_1206_3216Metric_Pad1.42x1.75mm_HandSolder | R3 |
| 1 | 28K | Resistor_SMD:R_1206_3216Metric_Pad1.42x1.75mm_HandSolder | R4 |
| 1 | 500K | Resistor_SMD:R_1206_3216Metric_Pad1.42x1.75mm_HandSolder | R5 |
| 1 | ATtiny13A | localparts:SOIJ-8_SOIC-8 | U1 |
| 1 | BTN1 | Button_Switch_SMD:SW_SPST_FSMSM | SW3 |
| 1 | DIGITS | Connector_PinHeader_2.54mm:PinHeader_1x08_P2.54mm_Vertical | J4 |
| 1 | GPS | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J3 |
| 1 | ISP | Connector_PinSocket_1.27mm:PinSocket_1x06_P1.27mm_Vertical | J1 |
| 1 | LDR03 | OptoDevice:R_LDR_5.2x5.2mm_P3.5mm_Horizontal | R2 |
| 1 | MAX7219 | localparts:SOP-24 | U2 |
| 1 | POWER_IN | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J2 |
| 1 | PROGRAM | Button_Switch_SMD:SW_SPST_FSMSM | SW2 |
| 1 | RESET | Button_Switch_SMD:SW_SPST_FSMSM | SW1 |
| 1 | S8050 J3Y | Package_TO_SOT_SMD:SOT-23 | Q2 |
| 1 | S8550 2TY | Package_TO_SOT_SMD:SOT-23 | Q1 |
| 1 | SEGMENTS | Connector_PinSocket_2.54mm:PinSocket_1x08_P2.54mm_Vertical | J6 |
The 23 most common of 24 parts.
Questions
How big is the Doom clock PCB?
It measures 70 × 50.1 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Doom clock use?
24 parts, built around the ATTINY13A-SU and MAX7219M. 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 Doom clock KiCad files?
From the stecman/avr-doomclock repository on GitHub, at the commit this page was made from: the board is hardware/doom-clock.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Doom clock design in my own project?
Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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