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Acorn serial

Twisted-Fields·acorn-robot-electronics·previous_revisions/serial_interface/acorn-serial.kicad_pcb

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

Acorn serial is an open source RP2040/RP2350 PCB design by Twisted-Fields, published on GitHub. It is a 2-layer board measuring 78.7 × 69.4 mm, with 96 components from 51 distinct parts.

Its main chip is the RP2040, from the RP2040/RP2350 family. Other key parts include the USBLC6-4SC6, W25Q128JVSIQ, ADC081S021CISD/NOPB, INA181A2 and PDS1-S3-S3-M. By type, the board carries 39 resistors, 14 ICs, 14 capacitors, 10 diodes, 9 test points and 7 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.

This board attaches to any raspberry pi 40 pin header or to the special 40 pin header on our robot motherboard and provides connections for opto-isolated RS-485 serial as well as emergency stop connections, designed to mate with our Odrive interface board.

Main components on the Acorn serial

USBLC6-4SC6W25Q128JVSIQADC081S021CISD/NOPBRP2040INA181A2PDS1-S3-S3-MMT2492ADS7822UTX4139TLV1117LV33DCYRTXS0101DCKRTC7SH34FU,LJ(CT

Acorn serial bill of materials (BOM)

96 components, 51 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
USBLC6-4SC6
SC16IS752
U1
1
W25Q128JVSIQ
SC16IS752
U2
1
ADC081S021CISD/NOPB
SC16IS752
U3
1
RP2040
FOD8012AR2
U4
1
ADC081S021CISD/NOPB
FOD8012AR2
U5
2
INA181A2
FOD8012AR2
U6, U7
1
PDS1-S3-S3-M
U8
1
MT2492
THVD1451D
U9
1
ADS7822U
THVD1451D
U10
1
TX4139
THVD1451D
U11
1
TLV1117LV33DCYR
THVD1451D
U12
1
TXS0101DCKR
FOD8012AR2
U13
1
TC7SH34FU,LJ(CT
buffer
U14
1
12MHZ
Crystal_GND24
Y1
2
Crystal_GND24
Y2, Y3
1
C2835315
Conn_01x04
J1
1
CONN_01X06
Conn_01x04
J2
4
RJ45_LED_Shielded
J7, J8, J9, J10
1
Raspberry_Pi_2_3
J11
9
TestPoint
TP1, TP2, TP3, TP4, TP5, TP6, TP7, TP8 +1
Show 31 more
QtyPartRefs
8
CDSOT23-SM712
Bourns Inc.
D1, D2, D3, D4, D5, D6, D7, D8
1
C551192
LED
D9
1
DESD5V0U1BA-7
D_TVS
D10
2
20P
18pF
C1, C2
3
18pF
C3, C5, C6
1
100N
18pF
C4
7
0.1uF
C7, C8, C9, C10, C11, C12, C13
1
100N
10uF
C14
1
10K
R1
1
C270948
1k
R2
1
C270948
10K
R3
1
1.1K
1k
R4
1
10K
R5
1
5.1K
1k
R6
1
5.1K
130R
R7
1
1.1K
750R
R8
1
10K
130R
R9
2
10K
750R
R10, R24
3
130R
R11, R13, R26
4
750R
R12, R14, R15, R25
6
C309610
750R
R16, R17, R18, R19, R21, R22
2
C309610
130R
R20, R23
2
C304067
750R
R27, R28
1
C122969
130R
R29
1
C100721
750R
R30
1
C22809
499R
R31
1
300K
499R
R32
1
21.5K
499R
R33
4
C304067
499R
R34, R35, R37, R38
1
C122969
499R
R36
1
C122969
220R
R39

Acorn serial 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.

Acorn serial: common questions

What microcontroller does the Acorn serial use?

The Acorn serial is built around the RP2040, from the RP2040/RP2350 family.

How big is the Acorn serial PCB?

The Acorn serial measures 78.7 × 69.4 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Acorn serial?

96 components, from 51 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 Acorn serial 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 Acorn serial 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 Acorn serial 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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