HardLabs

Shot timer mk1

jfkure·shot-timer-mk1·hardware/schematic/shot-timer-mk1.kicad_sch

This repository ships a schematic but no board layout.

About the Shot timer mk1 PCB

Shot timer mk1 is an open source AVR/Arduino PCB design by jfkure, published on GitHub under the GPL-3.0 license. It is a board, with 18 components from 17 distinct parts.

Its main chip is the Arduino Nano (ATmega328P), from the AVR/Arduino family. Other key parts include the SSD1306 OLED 0.96in and INA219 breakout. By type, the board carries 7 resistors, 3 switches, 2 ICs, 1 module, 1 connector and 1 battery holder.

It belongs with the power & battery designs in this gallery.

From the project

Open-source shot timer — Arduino Nano firmware, schematic, enclosure and manuals. Huckleberry Innovations.

An open-source shot timer for live-fire and dry-fire practice, built on an Arduino Nano. Press START, wait for the random beep, shoot, and press STOP to see your draw time, splits, totals and average on a two-color OLED.

Designed and built by Huckleberry Innovations — Lexington, SC. Want one ready to go? Order at huckleberryinnovations.com or email order@huckleberryinnovations.com.

Main components on the Shot timer mk1

SSD1306 OLED 0.96inINA219 breakoutArduino Nano (ATmega328P)

Shot timer mk1 bill of materials (BOM)

18 components, 17 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
SSD1306 OLED 0.96in
U1
1
INA219 breakout
U2
1
Arduino Nano (ATmega328P)
A1
1
TRRS breakout + lavalier mic
J1
1
9V USB-C Li-ion
BT1
1
Buzzer
BZ1
1
Power (latching, lit)
SW1
1
START (green 16mm)
SW2
1
STOP (red 16mm)
SW3
1
White LED (panel mount)
D1
1
10uF
C1
1
10k 1%
R1
2
2.2k 1%
R2, R4
1
4.7k 1%
R3
1
100k 1%
R5
1
22k 1%
R6
1
68k 1%
R7

Shot timer mk1 design files

The KiCad project lives in the jfkure/shot-timer-mk1 repository on GitHub; these links point at the commit this page was built from.

Shot timer mk1: common questions

What microcontroller does the Shot timer mk1 use?

The Shot timer mk1 is built around the Arduino Nano (ATmega328P), from the AVR/Arduino family.

How many components are on the Shot timer mk1?

18 components, from 17 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.

Where can I download the Shot timer mk1 design files?

From the jfkure/shot-timer-mk1 repository on GitHub, which has the schematic and the BOM; the links under Design files point to each one.

Can I use the Shot timer mk1 design in my own project?

Yes, under the terms of its GPL-3.0 license, which jfkure chose for the repository.

Can I test firmware for the Shot timer mk1 without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug AVR/Arduino firmware against it before you order a PCB.

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