2 layers10.5 × 14.5 mm
4 layers42 × 25 mm
Heptachron
adaand00/heptachron17 segment LED wrist watch
- Size
- 42 × 25 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 48
- Nets
- 47
- Pads
- 194
- Tracks, vias
- 667, 121
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 7 (file 20221018)
- Created
- 22 Feb 2024
- Updated
- 16 Nov 2024
Overview
Heptachron is an open-source printed circuit board by adaand00, from the adaand00/heptachron repository on GitHub, published under the MIT licence. It is a 4-layer board of 42 × 25 mm with 48 parts on 47 nets, routed with 667 tracks and 121 vias.
It is built around the ATTINY424-SSU, BQ25185DLHR and RV-3028-C7. Its parts include 9 resistors, 8 diodes, 7 capacitors, 7 ICs and 5 connectors. It belongs with the wearables boards and the AVR (ATmega, ATtiny) boards of this library.
Main components
3
ATTINY424-SSU
SOIC-14-40℃~+85℃ 1.8V~5.5V 12 128Byte 12bit 20MHz 4KB 512Byte 8 Bit AVR Built-in FLASH SOIC-14 Microcontrollers (MCU/MPU/SOC) ROHSMicrochip TechnologyMicrocontrollers (MCU/MPU/SOC)
BQ25185DLHR
WSON-10-EP(2.2x2)-40℃~+125℃ 1 1A 2.2V 3V~18V 4.4V 4uA Charging IC Lithium Battery、LiFePO4 Battery Support WSON-10-EP(2.2x2) Battery Management ROHSTexas InstrumentsBattery Management
RV-3028-C7
DFN-8(1.5x3.2)DFN-8(1.5x3.2) Real Time Clocks ROHSMicro CrystalReal Time Clocks
README
README.md __ ____________ _________ ________ ______ ____ _ __
/ / / / ____/ __ \/_ __/ | / ____/ / / / __ \/ __ \/ | / /
/ /_/ / __/ / /_/ / / / / /| |/ / / /_/ / /_/ / / / / |/ /
/ __ / /___/ ____/ / / / ___ / /___/ __ / _, _/ /_/ / /| /
/_/ /_/_____/_/ /_/ /_/ |_\____/_/ /_/_/ |_|\____/_/ |_/ Heptachron - 7 segment LED wrist watch
Latest prototype:
Concepts and ideas
Features
- 4 digits (hours and minutes)
- Seconds displayed in binary (6 bits)
- Always-on display
- Rechargeable battery
- Magnetic charger
- Long battery life
- Megatron
- Not waterproof
- Very accurate
Contributors
Adam Anderson: Electronics, programming
Gustav Abrahamsson: Electronics, mechanical design
Parts
48| Qty | Value | Footprint | References |
|---|---|---|---|
| 6 | ~ | LED_SMD:LED_0603_1608Metric | D38, D39, D40, D41, D42, D43 |
| 5 | 10K | Resistor_SMD:R_0603_1608Metric | R1, R2, R15, R16, R19 |
| 4 | 100n | Capacitor_SMD:C_0603_1608Metric | C1, C4, C6, C7 |
| 4 | MountingHole | Heptachron-Lib:MountingHole_1.5mm_PAD | H1, H2, H3, H4 |
| 4 | ~ | Heptachron-Lib:7-SEGMENT_NEW | U1, U2, U3, U4 |
| 3 | 2K | Resistor_SMD:R_0603_1608Metric | R13, R14, R18 |
| 2 | 1u | Capacitor_SMD:C_0805_2012Metric | C8, C10 |
| 2 | CLM | LED_SMD:LED_0603_1608Metric | D36, D37 |
| 2 | SW_Push | Heptachron-Lib:SW_TL6340AF160Q | SW1, SW2 |
| 1 | 10u | Capacitor_SMD:C_0805_2012Metric | C9 |
| 1 | 18K | Resistor_SMD:R_0603_1608Metric | R17 |
| 1 | 5V | Connector_Wire:SolderWirePad_1x01_SMD_1x2mm | J1 |
| 1 | ATtiny424-SS | Package_SO:SOIC-14_3.9x8.7mm_P1.27mm | U8 |
| 1 | BAT+ | Connector_Wire:SolderWirePad_1x01_SMD_1x2mm | J4 |
| 1 | BAT- | Connector_Wire:SolderWirePad_1x01_SMD_1x2mm | J5 |
| 1 | BQ25185DLHR | Heptachron-Lib:SON40P220X200X80-11N | IC1 |
| 1 | GND | Connector_Wire:SolderWirePad_1x01_SMD_1x2mm | J2 |
| 1 | GND | TestPoint:TestPoint_Pad_D1.0mm | TP6 |
| 1 | IS31FL3729 | Package_QFP:TQFP-32_7x7mm_P0.8mm | U7 |
| 1 | Q_PH | LED_SMD:LED_0603_1608Metric | Q1 |
| 1 | RV-3028-C7 | Heptachron-Lib:RV-3028-C7 | X1 |
| 1 | STAT1 | TestPoint:TestPoint_Pad_D1.0mm | TP1 |
| 1 | STAT2 | TestPoint:TestPoint_Pad_D1.0mm | TP2 |
| 1 | UPDI | Connector_Wire:SolderWirePad_1x01_SMD_1x2mm | J3 |
| 1 | VCC | TestPoint:TestPoint_Pad_D1.0mm | TP4 |
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Questions
How big is the Heptachron PCB?
It measures 42 × 25 mm and has 4 copper layers, 1.6 mm thick.
What parts does the Heptachron use?
48 parts, built around the ATTINY424-SSU, BQ25185DLHR and RV-3028-C7. 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 Heptachron KiCad files?
From the adaand00/heptachron repository on GitHub, at the commit this page was made from: the board is PCB/Heptachron/Heptachron.kicad_pcb and its schematic PCB/Heptachron/7-Segment-Cree-PLCC2.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Heptachron 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).