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UNDR

JohnDecebal·UNDR·PCB/ESP32 STEPPER CONTROL PCB/ESP32 STEPPER CONTROL PCB.kicad_pcb

UNDR PCB layout, top view — open source ESP32 board by JohnDecebal
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About the UNDR PCB

UNDR is an open source ESP32 PCB design by JohnDecebal, published on GitHub under the GPL-3.0 license. It is a 2-layer board measuring 75.8 × 92.5 mm, with 31 components from 25 distinct parts.

Its main chip is the ESP32-S3-DEVKIT, from the ESP32 family. Other key parts include the C9864 and DRV8825_STEPPER_MOTOR_DRIVER_CARRIER. By type, the board carries 9 capacitors, 7 resistors, 6 connectors, 4 ICs, 3 diodes and 1 transistor.

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

From the project

UNDR AUTO is a fully automatic WDT (Weiss Distribution Technique) tool designed for espresso enthusiasts. This open-source DIY project combines 3D printed parts with electronic and mechanical components to create a precise and customizable coffee distribution tool. By evenly dist

UNDR AUTO is a fully automatic WDT (Weiss Distribution Technique) tool designed for espresso enthusiasts. This open-source DIY project combines 3D printed parts with electronic and mechanical components to create a precise and customizable coffee distribution tool. By evenly distributing coffee grounds in the portafilter basket, UNDR AUTO aims to improve the consistency and quality of espresso shots.

Main components on the UNDR

C9864DRV8825_STEPPER_MOTOR_DRIVER_CARRIERESP32-S3-DEVKIT

UNDR bill of materials (BOM)

31 components, 25 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
C9864
TPS5430DDA
U1
2
DRV8825_STEPPER_MOTOR_DRIVER_CARRIER
U2, U4
1
ESP32-S3-DEVKIT
U3
1
C845611
HSU60P03
Q1
1
C136744
DC-005-20A
J1
1
C557655
Conn_01x03
J2
2
C161871
Conn_01x04
J3, J5
2
C706893
Conn_02x03_Odd_Even
J4, J6
1
C64982
B340A
D1
1
C132951
SMAJ12CA-TR
D2
1
C72038
Yellow
D3
1
C9905
22uH
L1
1
C100042
10nF
C1
2
C19110
2.2uF
C2, C3
1
C8024
220uF
C4
1
C12891
22uF
C5
1
C13585
10uF
C6
1
C24497
100nF
C7
2
C336212
100uF
C8, C9
1
C217729
13k
R1
Show 5 more
QtyPartRefs
1
C861436
4.12k
R2
2
C25804
10k
R3, R6
1
C23206
56k
R4
1
C25810
18k
R5
1
C23138
330R
R7

UNDR design files

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

UNDR: common questions

What microcontroller does the UNDR use?

The UNDR is built around the ESP32-S3-DEVKIT, from the ESP32 family.

How big is the UNDR PCB?

The UNDR measures 75.8 × 92.5 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the UNDR?

31 components, from 25 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 UNDR design files?

From the JohnDecebal/UNDR 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 UNDR design in my own project?

Yes, under the terms of its GPL-3.0 license, which JohnDecebal chose for the repository.

Can I test firmware for the UNDR without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug ESP32 firmware against it before you order a PCB.

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