HardLabs

Bike rear light

c4deszes·bike-rear-light·hw/design/rear-light.kicad_pcb

Bike rear light PCB layout, top view — open source Microchip SAM board by c4deszes

About the Bike rear light PCB

Bike rear light is an open source Microchip SAM PCB design by c4deszes, published on GitHub under the Custom license license. It is a 2-layer board measuring 65.8 × 21.8 mm, with 84 components from 25 distinct parts.

Its main chip is the ATSAMD21E18A-A, from the Microchip SAM family. Other key parts include the MCP2021A-330E/SN, TLD2331-3EP, TLD2132-1EP and BMA456. By type, the board carries 36 resistors, 22 capacitors, 15 diodes, 6 ICs, 4 transistors and 1 inductor.

From the project

Rear light for the bicycle with braking indication

This generation is meant to demonstrate the tail light and brake light capabilities, turn signals are not present.

- whether this simplified single PCB assembly is robust enough - whether the amount of light produced is sufficient - how certain lenses affect the optical qualities - what the thermals look like given the power consumption and enclosure with passive cooling - whether this accelerometer is reliable to be used for the brake lights

Main components on the Bike rear light

MCP2021A-330E/SNATSAMD21E18A-ATLD2331-3EPTLD2132-1EPBMA456

Bike rear light bill of materials (BOM)

84 components, 25 distinct parts.

QtyPartRefs
1
~
U100
1
MCP2021A-330E/SN
U300
1
ATSAMD21E18A-A
U400
1
TLD2331-3EP
U500
1
TLD2132-1EP
U600
1
BMA456
U700
4
2N7002
Q501, Q502, Q503, Q601
1
BAS3005B02
D200
2
SMF33CA-DIO
D201, D301
12
LED
D506, D507, D508, D511, D512, D513, D516, D517 +4
1
10uH
L409
1
220p
C302
4
10u
C303, C304, C407, C410
8
220n
C306, C408, C411, C414, C504, C602, C701, C702
1
2.2u
C412
6
10n
C509, C514, C519, C525, C607, C611
2
2.2n
C527, C613
14
10k
R305, R307, R413, R529, R531, R533, R536, R538 +6
1
1k
R403
4
0
R505, R510, R515, R603
Show 5 more
QtyPartRefs
4
18.3k
R520, R521, R522, R608
2
20k
R523, R609
6
0
R524, R526, R528, R610, R612, R614
1
47k
R532
4
220
R537, R539, R541, R617

Bike rear light design files

The KiCad project lives in the c4deszes/bike-rear-light repository on GitHub; these links point at the commit this page was built from.

Bike rear light: common questions

What microcontroller does the Bike rear light use?

The Bike rear light is built around the ATSAMD21E18A-A, from the Microchip SAM family.

How big is the Bike rear light PCB?

The Bike rear light measures 65.8 × 21.8 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Bike rear light?

84 components, from 25 distinct parts. The full bill of materials is listed on this page.

Where can I download the Bike rear light design files?

From the c4deszes/bike-rear-light repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Bike rear light design in my own project?

It is published under Custom license, which limits how it may be reused; read the license before building on it.

Can I test firmware for the Bike rear light without the hardware?

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

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