Lap Timer: Transmitter Board

Dominik-Workshop·lap-timer·pcb/transmitter-board/transmitter-board.kicad_pcb

Lap Timer: Transmitter Board layout, top view — open source board by Dominik-Workshop

About the Lap Timer: Transmitter Board

Lap Timer: Transmitter Board is an open source PCB design by Dominik-Workshop, published on GitHub under the GPL-3.0 license. It is a 2-layer board measuring 28.9 × 20.5 mm, with 26 components from 20 distinct parts.

Other key parts include the NE555D, TP4056 and DW01A. By type, the board carries 10 resistors, 5 capacitors, 3 ICs, 3 diodes, 2 transistors and 1 connector.

It belongs with the displays & leds designs in this gallery.

From the project

Lap timer, EKA 2 sem PWR

Compact and portable lap timer, capable of measuring time on:

- Closed-loop tracks (1-gate mode) - Start/finish tracks (2-gate mode)

Infrared light barriers are used as optical triggers to detect when an object crosses the start or finish line.

- High accuracy using STM32 hardware timers - OLED display for showing lap times - Two operating modes: 1-gate or 2-gate - Modulated IR system (38 kHz) for ambient light immunity

Lap Timer: Transmitter Board, from the project README — From the project README

Main components on the Lap Timer: Transmitter Board

NE555D TP4056 DW01A

Lap Timer: Transmitter Board bill of materials (BOM)

26 components, 20 distinct parts.

Qty	Part	Footprint	Refs
1	NE555D	SOIC-8_3.9x4.9mm_P1.27mm	U1
1	TP4056	SOIC-8-1EP_3.9x4.9mm_P1.27mm_EP2.41x3.3mm_ThermalVias	U3
1	DW01A	SOT-23-6	U4
2	AO3400A	SOT-23	Q3, Q4
1	USB-310-B-SU USB-C_USB-310F-B-SU HOOYA	USB-C-Receptacle_USB-310-B-SU	J1
1	Battery	PinSocket_1x02_P2.54mm_Vertical	BT1
1	SW_DPDT_x2	SW_DPDT_CK_JS202011JCQN	SW1
1	RED	LED_0603_1608Metric_Pad1.05x0.95mm_HandSolder	D1
1	BLUE	LED_0603_1608Metric_Pad1.05x0.95mm_HandSolder	D2
1	IR	LED_THT_Horizontal_SMD_mounted	D3
1	1n	C_0603_1608Metric_Pad1.08x0.95mm_HandSolder	C1
1	10n	C_0603_1608Metric_Pad1.08x0.95mm_HandSolder	C2
2	0.1u	C_0603_1608Metric_Pad1.08x0.95mm_HandSolder	C4, C6
1	10u	C_0603_1608Metric_Pad1.08x0.95mm_HandSolder	C7
4	1k	R_0603_1608Metric_Pad0.98x0.95mm_HandSolder	R1, R4, R7, R9
1	18.4k	R_0603_1608Metric_Pad0.98x0.95mm_HandSolder	R2
2	5.1k	R_0603_1608Metric_Pad0.98x0.95mm_HandSolder	R3, R6
1	10k	R_0603_1608Metric_Pad0.98x0.95mm_HandSolder	R5
1	200R	R_0603_1608Metric_Pad0.98x0.95mm_HandSolder	R8
1	100R	R_0603_1608Metric_Pad0.98x0.95mm_HandSolder	R10

Lap Timer: Transmitter Board design files

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

Lap Timer: Transmitter Board: common questions

How big is the Lap Timer: Transmitter Board?

The Lap Timer: Transmitter Board measures 28.9 × 20.5 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Lap Timer: Transmitter Board?

26 components, from 20 distinct parts. The full bill of materials is listed on this page.

Where can I download the Lap Timer: Transmitter Board design files?

From the Dominik-Workshop/lap-timer repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Lap Timer: Transmitter Board design in my own project?

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

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