4 layers86.1 × 66.3 mm
4 layers21.6 × 40 mm
USB Timer
Stevemwa/PCB_Designs1This Repo contains my various PCB Designs
- Size
- 21.6 × 40 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 16
- Nets
- 19
- Pads
- 57
- Tracks, vias
- 91, 6
- Pours
- 4
- Routed
- Yes
- KiCad
- KiCad 7 (file 20221018)
- Created
- 11 May 2024
- Updated
- 7 Feb 2025
Overview
USB Timer is an open-source printed circuit board by Stevemwa, from the Stevemwa/PCB_Designs repository on GitHub. It is a 4-layer board of 21.6 × 40 mm with 16 parts on 19 nets, routed with 91 tracks and 6 vias.
It is built around the ATTINY85-20SU, DS1307Z+ and IRLML6401. Its parts include 6 resistors, 2 capacitors, 2 ICs, 2 diodes and 2 connectors. It belongs with the AVR (ATmega, ATtiny) boards of this library.
Main components
3
ATTINY85-20SU
SOIC-8-208mil-40℃~+85℃ 10bit 2.7V~5.5V 20MHz 512Byte 512Byte 6 8 Bit 8KB AVR Built-in FLASH SOIC-8-208mil Microcontrollers (MCU/MPU/SOC) ROHSMicrochip TechnologyMicrocontrollers (MCU/MPU/SOC)
DS1307Z+
SO-80℃~+70℃ 10nA 300nA 4.5V~5.5V Backup power management and battery charging、InsideSRAM/NVRAM、Programmable clock output External I2C SO-8 Real Time Clocks ROHSMaxim Integrated (Analog Devices)Real Time Clocks
IRLML6401
SOT-23-55℃~+150℃ 1 P-Channel 1.3W 125pF 12V 15nC@5V 180pF 4.3A 830pF 85mΩ@1.8V 950mV P-Channel SOT-23 MOSFETs ROHSKEXINMOSFETs
README
README.mdALTIMETER
IP-SNIFFER
LCD BEEPER
PI ZERO SENSOR SHIELD
I2C MOTOR DRIVER
ESP32 DEV BOARD
ATTINY85 ALARM
AMPLIFIER WITH TUNNING
TELEMETRIC DASHCAM PCB
STM32 WIFI BOARD FOR SMART BMS
NFC MODEL TRAIN
ROBOKEN PCB
CAMERA TRAP PROTOTYPE
DIMM DDR3 TESTER
VEHICLE TRACKERS
Parts
16| Qty | Value | Footprint | References |
|---|---|---|---|
| 3 | 10k | Resistor_SMD:R_0603_1608Metric | R1, R2, R3 |
| 3 | 4k7 | Resistor_SMD:R_0603_1608Metric | R4, R5, R6 |
| 1 | 0.1uF | Capacitor_SMD:C_0603_1608Metric | C1 |
| 1 | 1N5819 | Diode_SMD:D_0805_2012Metric | D1 |
| 1 | 4.7uF | Capacitor_SMD:C_0603_1608Metric | C2 |
| 1 | ATTINY85-20SU | Package_DIP:DIP-8_W7.62mm | U3 |
| 1 | Crystal | Crystal:Crystal_AT310_D3.0mm_L10.0mm_Horizontal | Y1 |
| 1 | DS1307Z+ | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U2 |
| 1 | IRLML6401 | Package_TO_SOT_SMD:SOT-23 | Q2 |
| 1 | LED | LED_SMD:LED_0805_2012Metric | D2 |
| 1 | USB-AM-S-X-X-TH | C-Footprint:SAMTEC_USB-AM-S-X-X-TH | J3 |
| 1 | USB_A | Connector_USB:USB_A_Receptacle_GCT_USB1046 | J2 |
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Questions
How big is the USB Timer PCB?
It measures 21.6 × 40 mm and has 4 copper layers, 1.6 mm thick.
What parts does the USB Timer use?
16 parts, built around the ATTINY85-20SU, DS1307Z+ and IRLML6401. 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 Timer KiCad files?
From the Stevemwa/PCB_Designs repository on GitHub, at the commit this page was made from: the board is USB_Timer/USB_Timer.kicad_pcb and its schematic Attiny85_Alarm/Attiny85_Alarm.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the USB Timer design in my own project?
Its repository states no licence, so its author keeps all rights: ask Stevemwa before reusing the design.