4 layers28.7 × 42.5 mm
Squathero V1
jasonbowman55/PCB_Design
This repository will hold all of the necessary files for me to begin learning how to better design PCB boards, as well as project files for various PCB design projects.
41 parts
2 layers40 × 12.2 mm
USB 555timer
jasonbowman55/PCB_DesignThis repository will hold all of the necessary files for me to begin learning how to better design PCB boards, as well as project files for various PCB design projects.
- Size
- 40 × 12.2 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 12
- Nets
- 23
- Pads
- 53
- Tracks, vias
- 81, 27
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 19 Feb 2025
- Updated
- 19 May 2025
Overview
USB 555timer is an open-source printed circuit board by jasonbowman55, from the jasonbowman55/PCB_Design repository on GitHub. It is a 2-layer board of 40 × 12.2 mm with 12 parts on 23 nets, routed with 81 tracks and 27 vias.
It is built around the ATTINY85-20MU. Its parts include 4 resistors, 3 diodes, 2 ICs, 2 connectors and 1 capacitor. It belongs with the AVR (ATmega, ATtiny) boards of this library.
Main components
1README
README.mdPCB_Design
This repository will hold all of the necessary files for me to begin learning how to better design PCB boards, as well as project files for various PCB design projects.
Parts
12| Qty | Value | Footprint | References |
|---|---|---|---|
| 2 | 3V6 | Diode_SMD:D_SOD-123 | D1, D2 |
| 2 | 68R | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R1, R4 |
| 2 | Conn_01x04 | Connector_Wire:SolderWire-0.1sqmm_1x04_P3.6mm_D0.4mm_OD1mm | J1, J2 |
| 1 | 100n | Capacitor_SMD:C_1206_3216Metric_Pad1.33x1.80mm_HandSolder | C1 |
| 1 | 1k5 | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R3 |
| 1 | 330R | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R2 |
| 1 | ATtiny85-20M | Package_DFN_QFN:QFN-20-1EP_4x4mm_P0.5mm_EP2.6x2.6mm | U1 |
| 1 | LED | Capacitor_SMD:C_1206_3216Metric_Pad1.33x1.80mm_HandSolder | D3 |
| 1 | ~ | custom_library:PCB_USB_connector | U2 |
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Questions
How big is the USB 555timer PCB?
It measures 40 × 12.2 mm and has 2 copper layers, 1.6 mm thick.
What parts does the USB 555timer use?
12 parts, built around the ATTINY85-20MU. 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 USB 555timer KiCad files?
From the jasonbowman55/PCB_Design repository on GitHub, at the commit this page was made from: the board is Learning/1_usb_555timer/USB_555timer/USB_555timer.kicad_pcb and its schematic Learning/1_usb_555timer/USB_555timer/USB_555timer.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the USB 555timer design in my own project?
Its repository states no licence, so its author keeps all rights: ask jasonbowman55 before reusing the design.