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Soft start

Twisted-Fields·acorn-robot-electronics·soft_start/soft_start.kicad_pcb

Soft start PCB layout, top view — open source RP2040/RP2350 board by Twisted-Fields
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About the Soft start PCB

Soft start is an open source RP2040/RP2350 PCB design by Twisted-Fields, published on GitHub. It is a 4-layer board measuring 62 × 65.5 mm, with 55 components from 28 distinct parts.

Its main chip is the RP2040, from the RP2040/RP2350 family. Other key parts include the USBLC6-4SC6, W25Q128JVSIQ, LD1117S33TR_SOT223 and INA181A2. By type, the board carries 19 capacitors, 13 resistors, 6 transistors, 5 ICs, 5 diodes and 4 connectors.

It belongs with the robotics & motion designs in this gallery.

From the project

PCB hardware designs in KICAD for Acorn, the precision farming rover from Twisted Fields.

PCBs designed in Kicad for Acorn the farming robot.

Our dream is that you will fab your own boards, make changes, and share your work - giving this design life beyond our efforts.

Designed by Taylor Alexander for Twisted Fields, for the Acorn Precision Farming Rover.

Many thanks to Daniel Theobald. Without your financial support and encouragement this project would not have been possible.

Soft start, from the project README
From the project README

Main components on the Soft start

USBLC6-4SC6W25Q128JVSIQLD1117S33TR_SOT223RP2040INA181A2

Soft start bill of materials (BOM)

55 components, 28 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
USBLC6-4SC6
U1
1
W25Q128JVSIQ
U2
1
LD1117S33TR_SOT223
U3
1
RP2040
U4
1
INA181A2
U7
2
C2891566
Q_NMOS_GSD
Q1, Q2
4
C2758447
100V 34A PMOS
Q3, Q4, Q5, Q6
1
12MHZ
12MHz
Y1
1
CONN_01X06
Conn_01x06
J2
1
Power Output
J3
2
CONN_01X02
Conn_01x02
J4, J5
1
TestPoint
TP1
1
SS310
D1
2
C85383
Zener 10v
D2, D33
2
1N4148WS
D28, D29
1
47UH
47uH
L3
2
20P
20p
C1, C2
1
10U
10u
C3
11
100N
100n
C4, C14, C15, C29, C30, C31, C33, C34 +3
2
C342614
4.7uF 100V
C5, C7
Show 8 more
QtyPartRefs
1
C5246568
47uF 63V solid
C6
2
1u
C16, C32
2
10K
10k
R1, R2
2
C175463
2k 2 watt
R3, R40
1
1.1K
1.1k
R8
2
3mΩ
R13, R15
4
C304067
50k 0.1%
R34, R35, R37, R38
2
C122969
5.1k 0.1%
R36, R39

Soft start design files

The KiCad project lives in the Twisted-Fields/acorn-robot-electronics repository on GitHub; these links point at the commit this page was built from.

Soft start: common questions

What microcontroller does the Soft start use?

The Soft start is built around the RP2040, from the RP2040/RP2350 family.

How big is the Soft start PCB?

The Soft start measures 62 × 65.5 mm, has 4 copper layers and is 1.609 mm thick.

How many components are on the Soft start?

55 components, from 28 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 Soft start design files?

From the Twisted-Fields/acorn-robot-electronics 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 Soft start design in my own project?

The repository has no license, so all rights stay with Twisted-Fields. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the Soft start 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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