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Sand drawing

tjhowse·sand_drawing·pcb/sand_drawing/sand_drawing.kicad_pcb

Sand drawing PCB layout, top view — open source ESP32 board by tjhowse

About the Sand drawing PCB

Sand drawing is an open source ESP32 PCB design by tjhowse, published on GitHub under the Custom license license. It is a 2-layer board measuring 54.2 × 81.5 mm, with 27 components from 9 distinct parts.

Its main chip is the ESP32-WROOM-32D, from the ESP32 family. Other key parts include the AP63203WU-7. By type, the board carries 17 diodes, 6 capacitors, 2 ICs, 1 inductor and 1 resistor.

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

From the project

Code, PCBs and CAD for a SCARA-based sand drawing robot

So you've been reading about all the benefits of this "mindfulness" thing and you want to give it a try. You do some research and learn it requires "meditation", "introspection" and other kinds of tedious woo. Who has time for that? It's {current_year} for christ's sake! I don't want a tiny tray of rocks and sand on my desk to rake around. Surely there's some turn-key solution to this problem already.

Sand drawing, from the project README
From the project README

Main components on the Sand drawing

AP63203WU-7ESP32-WROOM-32D

Sand drawing bill of materials (BOM)

27 components, 9 distinct parts.

QtyPartRefs
1
AP63203WU-7
AP63203WU
U1
1
ESP32-WROOM-32D
U2
17
Taiwan Semiconductor SS210
100V 850mV@2A Schottky Diode
D1, D2, D3, D4, D5, D6, D7, D8 +9
1
Wurth 74439346068
6.8µH
L1
1
CL21C101JBANNNC
50V 100pF ±5%
C1
1
CGA5L1X7R1V106K160AE
10µF/35V ±10%
C2
2
CGA3E2X7R1H104K080AA
100nF/50V ±10%
C3, C6
2
C3216X5R1E226M160AB
22µF/25V ±20%
C4, C5
1
CRGP0603F10K
10k 1% 0.25W
R1

Sand drawing design files

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

Sand drawing: common questions

What microcontroller does the Sand drawing use?

The Sand drawing is built around the ESP32-WROOM-32D, from the ESP32 family.

How big is the Sand drawing PCB?

The Sand drawing measures 54.2 × 81.5 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Sand drawing?

27 components, from 9 distinct parts. The full bill of materials is listed on this page.

Where can I download the Sand drawing design files?

From the tjhowse/sand_drawing repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Sand drawing design in my own project?

It is published under Custom license, which limits how it may be reused; read the license before building on it.

Can I test firmware for the Sand drawing 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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