4 layers42.6 × 56.6 mm
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177 parts
2 layers101.6 × 152.4 mm
ShotTimer
SnakeDoc/ShotTimer2A Shot Timer for tracking shot times, splits and more.
- Size
- 101.6 × 152.4 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 104
- Nets
- 74
- Pads
- 331
- Tracks, vias
- 526, 13
- Pours
- 6
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 1 Aug 2018
- Updated
- 14 Aug 2025
Overview
ShotTimer is an open-source printed circuit board by SnakeDoc, from the SnakeDoc/ShotTimer repository on GitHub, published under the MIT licence. It is a 2-layer board of 101.6 × 152.4 mm with 104 parts on 74 nets, routed with 526 tracks and 13 vias.
It is built around the ATMEGA328P-PU, RN4871-I/RM140 and TSR 1-2433, with the LT1303CN8-5#PBF, MAX4466EXK+T and MCP3201-CI/P among its other parts. Its parts include 39 resistors, 19 capacitors, 15 diodes, 9 switches and 8 ICs. It belongs with the AVR (ATmega, ATtiny) boards of this library.
Main components
9
ATMEGA328P-PU
DIP-28-300mil-40℃~+85℃ 1.8V~5.5V 10bit 1KB 20MHz 23 2KB 32KB 8 Bit AVR Built-in FLASH DIP-28-300mil Microcontrollers (MCU/MPU/SOC) ROHSMicrochip TechnologyMicrocontrollers (MCU/MPU/SOC)
RN4871-I/RM140
SMD-16P0dBm RN4871 chip SPI、UART、I2C、AIO、PIO SMD-16P Bluetooth Modules ROHSMicrochip TechnologyBluetooth Modules
TSR 1-2433
SIP,11.6x7.5mm-40℃~+85℃ 1 10.2mm 11.6mm 1A 2200uF 3.3V 300uA 50mVp-p 6V~36V 7.5mm 80%、90% 850kHz Plastic encapsulated type Short Circuit Protection、Automatic fault recovery Step-down type ±1% SIP,11.6x7.5mm DC-DC Power Modules ROHSYLPTECDC-DC Power Modules
LT1303CN8-5#PBF
PDIP-80℃~+70℃@(TA) 1 1.8V~10V 155kHz 5V Boost Boost Built-in Fixed No PDIP-8 DC-DC Converters ROHSAnalog DevicesDC-DC Converters
MAX4466EXK+T
SC-70-5-40℃~+85℃ 0.03% 1-Channel 112dB 2.4V~5.5V 24A SC-70-5 Audio Amplifiers ROHSMaxim Integrated (Analog Devices)Audio AmplifiersMCP3201-CI/P
PDIP-8-40℃~+85℃ 0.5LSB 1 100kHz 12 2.7V~5.5V 2LSB 500nA 800kHz、1.6MHz External External SAR SPI Yes PDIP-8 Analog to Digital Converters (ADC) ROHSMicrochip TechnologyAnalog To Digital Converters (ADC)25LC1024-I/P
PDIP-8-40℃~+85℃ 1,000,000 cycles 1Mbit 2.5V~5.5V 200 Years 20MHz 6ms SPI PDIP-8 EEPROM ROHSMicrochip TechnologyEEPROM
CD74HC151E
PDIP-16-55℃~+125℃ 29ns@6V,50pF 2V~6V 5.2mA 5.2mA 74HC 8uA Reverse function Single Supply PDIP-16 Signal Switches, Multiplexers, Decoders ROHSTexas InstrumentsSignal Switches, Multiplexers, Decoders
CMA-4544PF-W
--44dB@±2dB 2.2kΩ 3V~10V 4.65mm 500uA 60dB 9.7mm Omnidirectional 插件,D=9.7mm Microphones ROHSCUIBuzzers
README
README.mdShot Timer
Copyright 2018 Jason Sipula
A sport shooting training aid that tracks individual shot times, splits and more.
Completed Hardware (LCD Screen disconnected for testing):
Circuit Schematic:
Traces:
Ground and Power Planes:
Bare Board (hand for scale reference):
Board Assembly:
Parts
104| Qty | Value | Footprint | References |
|---|---|---|---|
| 26 | 10K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R1, R2, R3, R10, R11, R12, R13, R14, R16, R18, R19, R20, R25, R26, R27, R28 +10 |
| 11 | 0.1uF | Capacitor_THT:C_Disc_D5.1mm_W3.2mm_P5.00mm | C1, C2, C3, C4, C9, C13, C14, C17, C21, C22, C26 |
| 11 | 1N5817 | Diode_THT:D_DO-41_SOD81_P10.16mm_Horizontal | D1, D2, D3, D4, D5, D6, D7, D8, D9, D10, D11 |
| 8 | BTN | ShotTimer:SW_B3F-10xx | SW1, SW2, SW3, SW4, SW5, SW6, SW7, SW8 |
| 4 | 330 | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P5.08mm_Horizontal | R21, R22, R23, R24 |
| 3 | 220uF | Capacitor_THT:CP_Radial_D8.0mm_P3.50mm | C5, C6, C7 |
| 2 | 100K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R15, R38 |
| 2 | 1M | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R33, R34 |
| 2 | 22pF | Capacitor_THT:C_Disc_D3.8mm_W2.6mm_P2.50mm | C15, C16 |
| 2 | 2K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R29, R30 |
| 2 | Ferrite_Bead | Ferrite_THT:LairdTech_28C0236-0JW-10 | FB1, FB2 |
| 2 | Yellow | LED_THT:LED_D3.0mm | LED2, LED4 |
| 1 | 100pF | Capacitor_THT:C_Disc_D3.8mm_W2.6mm_P2.50mm | C25 |
| 1 | 10nF | Capacitor_THT:C_Disc_D4.7mm_W2.5mm_P5.00mm | C23 |
| 1 | 16MHz | Crystal:Crystal_HC49-U_Vertical | Y1 |
| 1 | 1K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R17 |
| 1 | 1uF | Capacitor_THT:C_Disc_D7.5mm_W4.4mm_P5.00mm | C24 |
| 1 | 25LC1024-I/P | Package_DIP:DIP-8_W7.62mm | U7 |
| 1 | 316K 1% | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R4 |
| 1 | 33uH | Inductor_THT:L_Radial_D7.8mm_P5.00mm_Fastron_07HCP | L1 |
| 1 | 412K 1% | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R5 |
| 1 | ATmega328P-PU | Package_DIP:DIP-28_W7.62mm | U5 |
| 1 | CD74HC151E | Package_DIP:DIP-16_W7.62mm | U1 |
| 1 | CMA-4544PF-W | MIC_CMA-4544PF-W | MK1 |
| 1 | Green | LED_THT:LED_D3.0mm | LED1 |
| 1 | ISP | Connector_PinHeader_2.54mm:PinHeader_2x03_P2.54mm_Vertical | J2 |
| 1 | ISP_PWR | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | JP2 |
| 1 | LT1303CN8-5#PBF | ShotTimer:PDIP-8_N | U4 |
| 1 | MAX4466EXK | SOT65P210X110-5N | U8 |
| 1 | MCP3201 | Package_DIP:DIP-8_W7.62mm | U6 |
| 1 | NHD-0420CW-SPI | ShotTimer:NHD_NHD-0420CW-AG3 | DS1 |
| 1 | Q_NPN_EBC | Package_TO_SOT_THT:TO-92 | Q1 |
| 1 | Q_PNP_CBE | Package_TO_SOT_THT:TO-92 | Q2 |
| 1 | RN4871-I/RM140 | RF_Module:Microchip_RN4871 | U3 |
| 1 | Red | LED_THT:LED_D3.0mm | LED3 |
| 1 | Reset | ShotTimer:SW_B3F-10xx | SW9 |
| 1 | SERIAL | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J3 |
| 1 | SYS_CFG | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | JP1 |
| 1 | SYS_PWR | TerminalBlock:TerminalBlock_bornier-2_P5.08mm | J1 |
| 1 | Speaker | ShotTimer:PS1420P02CT | BZ1 |
| 1 | TSR_1-2433 | Converter_DCDC:Converter_DCDC_TRACO_TSR-1_THT | U2 |
Questions
How big is the ShotTimer PCB?
It measures 101.6 × 152.4 mm and has 2 copper layers, 1.6 mm thick.
What parts does the ShotTimer use?
104 parts, built around the ATMEGA328P-PU, RN4871-I/RM140, TSR 1-2433 and LT1303CN8-5#PBF. 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 ShotTimer KiCad files?
From the SnakeDoc/ShotTimer repository on GitHub, at the commit this page was made from: the board is hardware/designs/KiCad/ShotTimer/ShotTimer.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the ShotTimer 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).
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