4 layers86.1 × 66.3 mm
2 layers35.9 × 45.4 mm
USB Timer Prototype
Stevemwa/PCB_Designs1This Repo contains my various PCB Designs
- Size
- 35.9 × 45.4 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 16
- Nets
- 19
- Pads
- 57
- Tracks, vias
- 109, 6
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 7 (file 20221018)
- Created
- 11 May 2024
- Updated
- 7 Feb 2025
Overview
USB Timer Prototype is an open-source printed circuit board by Stevemwa, from the Stevemwa/PCB_Designs repository on GitHub. It is a 2-layer board of 35.9 × 45.4 mm with 16 parts on 19 nets, routed with 109 tracks and 6 vias.
It is built around the ATTINY85-20PU, DS1307+ and BD136. 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
ATTINY85-20PU
PDIP-8-40℃~+85℃ 10bit 2.7V~5.5V 20MHz 512Byte 512Byte 6 8 Bit 8KB AVR Built-in FLASH PDIP-8 Microcontrollers (MCU/MPU/SOC) ROHSMicrochip TechnologyMicrocontrollers (MCU/MPU/SOC)DS1307+
DIP-80℃~+70℃ 300nA 4.5V~5.5V Backup power management and battery charging、InsideSRAM/NVRAM、Programmable clock output External I2C DIP-8 Real Time Clocks ROHSMaxim Integrated (Analog Devices)Real Time Clocks
BD136
TO-126-55℃~+150℃ 1 NPN 1.5A 100nA 1W 300 45V 500mV@1.5A,0.15A 50MHz 6V Independent NPN TO-126 Bipolar (BJT) ROHSHXY MOSFETBipolar (BJT)
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_0805_2012Metric | R1, R2, R3 |
| 3 | 4k7 | Resistor_SMD:R_0805_2012Metric | R4, R5, R6 |
| 1 | 0.1uF | Capacitor_SMD:C_0805_2012Metric | C1 |
| 1 | 1N4004 | Diode_THT:D_DO-41_SOD81_P10.16mm_Horizontal | D1 |
| 1 | 4.7uF | Capacitor_SMD:C_0805_2012Metric | C2 |
| 1 | ATtiny85-20P | Package_DIP:DIP-8_W7.62mm | U1 |
| 1 | BD136 | Package_TO_SOT_THT:TO-126-3_Vertical | Q1 |
| 1 | Crystal | Crystal:Crystal_AT310_D3.0mm_L10.0mm_Vertical | Y1 |
| 1 | DS1307+ | Package_DIP:DIP-8_W7.62mm | U2 |
| 1 | LED | LED_THT:LED_D5.0mm | D2 |
| 1 | USB-AM-S-X-X-TH | C-Footprint:SAMTEC_USB-AM-S-X-X-TH | J1 |
| 1 | USB_A | Connector_USB:USB_A_Receptacle_GCT_USB1046 | J2 |
Questions
How big is the USB Timer Prototype PCB?
It measures 35.9 × 45.4 mm and has 2 copper layers, 1.6 mm thick.
What parts does the USB Timer Prototype use?
16 parts, built around the ATTINY85-20PU, DS1307+ and BD136. 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 Prototype KiCad files?
From the Stevemwa/PCB_Designs repository on GitHub, at the commit this page was made from: the board is USB_Timer_Prototype/USB_Timer_Prototype.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 Prototype design in my own project?
Its repository states no licence, so its author keeps all rights: ask Stevemwa before reusing the design.
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