HardLabs

Underdog

MIsfitMatty·SpeedyBoards·UA4C/vC2-WHITE FANG/Underdog.kicad_pcb

Underdog PCB layout, top view — open source AVR/Arduino board by MIsfitMatty

About the Underdog PCB

Underdog is an open source AVR/Arduino PCB design by MIsfitMatty, published on GitHub under the GPL-2.0 license. It is a 2-layer board measuring 100 × 99.8 mm, with 202 components from 46 distinct parts.

Its main chip is the ARDUINO_MEGA_SHIELD, from the AVR/Arduino family. Other key parts include the IXDN602SIA, BARO, TS2940CP50, MAP and MP6600. By type, the board carries 76 resistors, 35 capacitors, 33 diodes, 22 LEDs, 12 transistors and 10 connectors.

It belongs with the usb & debug tools designs in this gallery.

From the project

The reset button was added as the only reset connection made to the microcontroller to prevent unwanted resets from USB connected devices. There is a caveat to this arrangement though. While the first time a firmware is loaded it will go on without intervention, subsequent times

The reset button was added as the only reset connection made to the microcontroller to prevent unwanted resets from USB connected devices. There is a caveat to this arrangement though. While the first time a firmware is loaded it will go on without intervention, subsequent times will require the user to hold the reset button down then release the button when the program starts the upload process. If the upload does not start right away go back and try again.

Main components on the Underdog

IXDN602SIABAROTS2940CP50MAPMP6600B72520E0140K062

Underdog bill of materials (BOM)

202 components, 46 distinct parts.

QtyPartRefs
2
IXDN602SIA
IC2, IC3
1
BARO
U1
1
TS2940CP50
U2
1
MAP
U3
1
MP6600
U4
1
B72520E0140K062
U5
8
NCV8408BDTRKG
Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8
4
NCV8402AD
Q9, Q10, Q11, Q12
1
External MAP Conn
J1
1
INPUTS
P1
1
OUTPUTS
P2
1
SER0
P3
1
SER3
P4
1
SER2
P5
1
SPI0
P6
1
SPI1
P7
1
CAN
P9
1
Dual VR C
P10
1
0ZCJ0050AF2E
F1
2
HALL_VR
JP2, JP3
Show 26 more
QtyPartRefs
3
PULLUP
JP4, JP5, JP13
1
ARDUINO_MEGA_SHIELD
SHIELD1
22
RED
LED1, LED2, LED3, LED4, LED5, LED6, LED7, LED8 +14
18
BAS70KFILM
D1, D11, D12, D13, D15, D16, D17, D18 +10
13
BAT54S
D2, D3, D4, D5, D6, D7, D8, D9 +5
1
B160-13-F
D29
1
1SMB5919BT3G
D30
15
u1
C1, C2, C4, C6, C9, C10, C14, C16 +7
8
u22
C3, C5, C11, C12, C15, C20, C23, C34
6
1u
C7, C8, C18, C24, C26, C35
2
47p
C13, C21
2
47u 50v
C17, C30
1
u01
C28
1
47u
C31
1
56r
R1
1
3k9 0.1%
R2
1
1k 0.1%
R3
17
470r
R4, R5, R8, R9, R10, R13, R16, R17 +9
5
2k49 0.1%
R6, R7, R12, R15, R19
3
51k
R11, R18, R75
19
2k7
R14, R23, R26, R31, R34, R39, R40, R43 +11
4
15r
R21, R28, R29, R36
20
100k
R24, R25, R32, R33, R41, R42, R45, R46 +12
2
1K
R59, R62
2
220r
R60, R61
1
220k
R76

Underdog design files

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

Underdog: common questions

What microcontroller does the Underdog use?

The Underdog is built around the ARDUINO_MEGA_SHIELD, from the AVR/Arduino family.

How big is the Underdog PCB?

The Underdog measures 100 × 99.8 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Underdog?

202 components, from 46 distinct parts. The full bill of materials is listed on this page.

Where can I download the Underdog design files?

From the MIsfitMatty/SpeedyBoards repository on GitHub, which has the KiCad layout; the links under Design files point to each one.

Can I use the Underdog design in my own project?

Yes, under the terms of its GPL-2.0 license, which MIsfitMatty chose for the repository.

Can I test firmware for the Underdog 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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