

Voltmeter Clock
- Size
- 133.4 × 50.8 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 62
- Nets
- 30
- Pads
- 190
- Tracks, vias
- 553, 68
- Pours
- 3
- Routed
- Yes
- KiCad
- KiCad 3
- Created
- 3 Jan 2014
- Updated
- 22 Jun 2016
Overview
Clock is an open-source printed circuit board by awkwardengineer, from the awkwardengineer/Clock repository on GitHub. It is a 2-layer board of 133.4 × 50.8 mm with 62 parts on 30 nets, routed with 553 tracks and 68 vias.
It is built around the ATTINY84A-SSF and MCP1624-I/MC. Its parts include 16 resistors, 11 connectors, 10 capacitors, 5 transistors and 4 ICs. It belongs with the lEDs and displays boards and the AVR (ATmega, ATtiny) boards of this library.
Main components
2ATTINY84A-SSF
SOIC-14-40℃~+125℃ 1.8V~5.5V 10bit 12 20MHz 512Byte 8 Bit 8KB AVR Built-in FLASH SOIC-14 Microcontrollers (MCU/MPU/SOC) ROHSMicrochip TechnologyMicrocontrollers (MCU/MPU/SOC)MCP1624-I/MC
DFN-8-EP(2x3)-40℃~+125℃@(TJ) 1 350mV~5.5V 500kHz Boost Boost Built-in Yes DFN-8-EP(2x3) DC-DC Converters ROHSMicrochip TechnologyDC-DC Converters
README
README.md
Intro
This is the repository for the AWK-105 Voltmeter clock. Here is where we'll be storing requirements documents, design history files, useful tidbits of information, and other material that otherwise wouldn't be release to manufacture or included in a Bill of Materials
##Consumer Facing Page The repo may be cool, but it's not for everyone. The consumer facing product page has the bulk of the media material.
##How This Repo Is Organized In general, there are two categories of thing:
- Artifacts that will become part of the Bill Of Materials and will be released to a manufacturer. This includes CAD files, drawings, Gerbers, etc.
- Documentation and design files that record useful and important information, but that the manufacturer doesn't need to actually MAKE something.
The idea was to try to organize the documentation near the design file, kindof like things are arranged below.
Clock
|
|--Mechanical
| |----CAD <=== BOM artifacts, 3d part files, drawings
| |----Design Docs <=== Documentation specific to mechanical stuff
| |----Reference Mat. <=== Usually mostly .pdfs
|
|--Electrical
| |----CAD <=== Gerbers, net files, etc...
| |----Design Docs <=== Documentation specific to electrical stuff
|
|--Photos
|
|--etc...
##Design Documents Here are some quick links to some design stuff, right off the bat.
[Requirements](Electrical/Design Docs/requirements.md)
[Microchip selection](Electrical/Design Docs/microcontroller selection.md)
Sales strategy
Parts
62| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | CONN_2 | TE-connectivity-2 | P5, P6, P7, P9 |
| 4 | FET_N | SOT23 | Q1, Q3, Q4, Q5 |
| 3 | .01uF | SM0805 | C5, C6, C8 |
| 3 | 10K | SM0805 | R3, R9, R12 |
| 3 | 10uF | SM0805 | C1, C3, C9 |
| 3 | 220 | SM0805 | R13, R14, R15 |
| 3 | CONN_2 | SIL-2 | P2, P3, P4 |
| 3 | Val** | BREAK_HOLE | BREAK_TAB, BREAK_TAB, BREAK_TAB |
| 2 | 0K | SM0805 | R1, R16 |
| 2 | 12.5pF | SM0805 | C2, C4 |
| 2 | 33K | SM0805 | R7, R8 |
| 2 | 51K | SM0805 | R10, R11 |
| 2 | AMMETER | ammeter | DS1, DS2 |
| 2 | BATTERY_CLIP | AA_Battery_Clip_THRU_HOLE_BK-92 | BT1, BT2 |
| 2 | LED | SIL-2 | D2, D3 |
| 1 | 100K | bourns_knob | R2 |
| 1 | 100K | SM0805 | R4 |
| 1 | 130K | SM0805 | R5 |
| 1 | 1uF | SM0805 | C10 |
| 1 | 1uF | C1 | C7 |
| 1 | 200K | SM0805 | R6 |
| 1 | 4.7uH | SM0805 | L1 |
| 1 | ATTINY84A-SS | SO14E | IC1 |
| 1 | AVR-ISP-6 | ISPheader | CON1 |
| 1 | CONN_6 | SIL-6_s | P1 |
| 1 | CRYSTAL 32.768kHz | SMD_CRYSTAL_SMALL | X1 |
| 1 | DIODE | SM0805 | D4 |
| 1 | DIODE | SIL-2 | D1 |
| 1 | FET_P | SOT23 | Q2 |
| 1 | MCP1624 | SOT23_6 | U1 |
| 1 | MCP1702T-1502E/CB | SOT23 | U3 |
| 1 | MCP1702T-1502E/TO | TO92-INVERT | U2 |
| 1 | QUADRATURE_ENCODR | bourns_encoder | S1 |
| 1 | SPEAKER | SMT_BUZZER | SP1 |
| 1 | SPKR | SIL-2 | P8 |
| 1 | SPST | SIL-2 | SW1 |
| 1 | USB-MICRO-B | USB_MINI_B_s | CON2 |
Questions
How big is the Clock PCB?
It measures 133.4 × 50.8 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Clock use?
62 parts, built around the ATTINY84A-SSF and MCP1624-I/MC. 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 Clock KiCad files?
From the awkwardengineer/Clock repository on GitHub, at the commit this page was made from: the board is Electrical/Board Design/clock.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Clock design in my own project?
Its repository states no licence, so its author keeps all rights: ask awkwardengineer before reusing the design.
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