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Dropkick

rrainey·dropkick·pcb-sam/dropkick.kicad_pcb

Dropkick PCB layout, top view — open source Microchip SAM board by rrainey
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About the Dropkick PCB

Dropkick is an open source Microchip SAM PCB design by rrainey, published on GitHub under the MIT license. It is a 2-layer board measuring 44.5 × 50.8 mm, with 45 components from 39 distinct parts.

Its main chip is the ATSAMD21G18A-AUT, from the Microchip SAM family. Other key parts include the SPX3819-3.3, SAM-M8Q-0-10, MCP73831T-2ACI/OT and MPU-6050. By type, the board carries 14 capacitors, 12 resistors, 6 ICs, 4 connectors, 3 inductors and 2 switches.

It belongs with the rf & radio and sensors designs in this gallery.

From the project

A data logger designed for skydivers

These devices are designed to be carried in a skydiver's breast pocket. The device loggs GPS position, barometric altitude, body rotation rates, and acceleration forces. Data is logged to a SD card for analysis on the ground.

There are two board variants active in this project: V4 SAM, is the board I use for skydiving. V5-CAM is a design repurposed for real-time use on a telescope pointing experiments. See CHANGELOG.md for a more detailed history.

Dropkick, from the project README
From the project README

Main components on the Dropkick

SPX3819-3.3SAM-M8Q-0-10MCP73831T-2ACI/OTATSAMD21G18A-AUTMPU-6050

Dropkick bill of materials (BOM)

45 components, 39 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
SPX3819-3.3
U1
1
SAM-M8Q-0-10
SAM-M10Q
U2
1
MCP73831T-2ACI/OT
U3
1
ATSAMD21G18A-AUT
U4
1
MPU-6050
BMP390
U5
1
SPX3819-3.3
ICM-42688-P
U6
1
MEM2061-01-188-00-A
X1
1
USB4085-GF-A
USB C USB2.0
J1
1
S2B-PH-SM4-TB
BATT
J2
1
DNP
Conn_01x08
J3
1
3221-10-0300-00-TR
J4
1
1056TR
CR1220
B1
1
450405020524
SW1
1
KMR211NG_LFS
SW2
1
LTST-C191KFKT
CHG1
1
SM5817PL-TP
SCHOTTKY 20V
D1
2
LTST-S270KGKT
L1, L3
1
LTST-S270KRKT
L2
1
1UF
1uF
C1
1
10UF
10uF
C2
Show 19 more
QtyPartRefs
2
10uF
C3, C4
1
1UF
10uF
C5
1
0.1UF
22pF
C6
1
22PF
22pF
C7
1
22PF
10uF
C8
1
1uF
C9
1
1UF
0.1uF
C10
1
10UF
2.2uF
C11
1
0.1UF
100nF
C12
1
2.2NF
100nF
C13
1
10nF
C14
2
100K
5.1K
R1, R2
1
100K
R3
2
100K
R4, R5
3
10K
R6, R11, R12
1
1K
R7
1
2.2K
R8
1
2.2K
R9
1
10K
2.2K
R10

Dropkick design files

The KiCad project lives in the rrainey/dropkick repository on GitHub; these links point at the commit this page was built from.

Dropkick: common questions

What microcontroller does the Dropkick use?

The Dropkick is built around the ATSAMD21G18A-AUT, from the Microchip SAM family.

How big is the Dropkick PCB?

The Dropkick measures 44.5 × 50.8 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Dropkick?

45 components, from 39 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 Dropkick design files?

From the rrainey/dropkick repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.

Can I use the Dropkick design in my own project?

Yes, under the terms of its MIT license, which rrainey chose for the repository.

Can I test firmware for the Dropkick 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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