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Pico2-test mule

mikesmitty·rp24-dcc-decoder·hardware/pico2-test-mule/pico2-test-mule.kicad_pcb

Pico2-test mule PCB layout, top view — open source RP2040/RP2350 board by mikesmitty
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About the Pico2-test mule PCB

Pico2-test mule is an open source RP2040/RP2350 PCB design by mikesmitty, published on GitHub under the CERN-OHL-P-2.0 license. It is a 2-layer board measuring 52.5 × 42 mm, with 68 components from 40 distinct parts.

Its main chip is the AP1606, from the RP2040/RP2350 family. Other key parts include the NCS2220AMUT1G, AP63203WU, MAX98357AEWL+T and MD9927. By type, the board carries 21 diodes, 17 resistors, 13 transistors, 9 capacitors, 4 ICs and 3 connectors.

It belongs with the audio designs in this gallery.

From the project

DIY DCC decoder for model railroad locomotives in an E24 form factor, powered by an RP2350 (Raspberry Pi Pico 2)

Inspired by the rp2040-decoder project by gab-k: https://github.com/gab-k/RP2040-Decoder

Pico2-test mule, from the project README
From the project README

Main components on the Pico2-test mule

NCS2220AMUT1GAP63203WUMAX98357AEWL+TMD9927

Pico2-test mule bill of materials (BOM)

68 components, 40 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
NCS2220AMUT1G
U1
1
AP63203WU
U2
1
MAX98357AEWL+T
U4
1
MD9927
U5
2
AP1606
Q1, Q4
5
SS8050
Q2, Q3, Q5, Q6, Q8
2
NST847BPDP6T5G
Q7, Q9
4
DMN2991UDA-7B
Q10, Q11, Q12, Q13
1
SPEAKER
J1
1
POWER
J2
1
AUX
J3
4
LMBR4020H3T5G
D1, D2, D7, D8
1
C2290
LAMP_FRONT
D3
1
C2290
LAMP_REAR
D4
1
AUX1
D5
1
AUX2
D6
1
AUX3
D9
1
AUX4
D10
1
AUX5
D11
1
AUX6
D12
Show 20 more
QtyPartRefs
2
RB161QS-40
D13, D18
1
AUX7
D14
1
AUX8
D15
1
AUX10
D16
1
AUX11
D17
1
AUX12
D19
2
BZT52C3V3S
D20, D21
1
4.7UH
4.7uH
L1
3
100NF
100nF
C1, C3, C10
1
10UF
10uF
C2
1
22UF
22uF
C4
1
100UF
100uF
C5
2
4.7UF
4.7uF
C7, C9
1
47UF
47uF
C8
7
6.8K
R1, R9, R10, R11, R13, R15, R16
4
1K
R2, R4, R12, R14
1
2.2K
R3
1
100R
R7
1
22R
R8
3
R_PACK04
R_Pack04
RN1, RN2, RN3

Pico2-test mule design files

The KiCad project lives in the mikesmitty/rp24-dcc-decoder repository on GitHub; these links point at the commit this page was built from.

Pico2-test mule: common questions

What microcontroller does the Pico2-test mule use?

The Pico2-test mule is built around the AP1606, from the RP2040/RP2350 family.

How big is the Pico2-test mule PCB?

The Pico2-test mule measures 52.5 × 42 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Pico2-test mule?

68 components, from 40 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 Pico2-test mule design files?

From the mikesmitty/rp24-dcc-decoder 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 Pico2-test mule design in my own project?

Yes, under the terms of its CERN-OHL-P-2.0 license, which mikesmitty chose for the repository.

Can I test firmware for the Pico2-test mule without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug RP2040/RP2350 firmware against it before you order a PCB.

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