HardLabs

Bullion

coddingtonbear·bullion·hardware/bullion.kicad_pcb

Bullion PCB layout, top view — open source AVR/Arduino board by coddingtonbear

About the Bullion PCB

Bullion is an open source AVR/Arduino PCB design by coddingtonbear, published on GitHub. It is a 2-layer board measuring 38.8 × 27.3 mm, with 21 components from 16 distinct parts.

Its main chip is the ATMEGA328P-A, from the AVR/Arduino family. Other key parts include the SJ1-3524NG and CH340G. By type, the board carries 8 capacitors, 5 resistors, 3 ICs, 2 connectors, 2 diodes and 1 crystal.

It belongs with the test & measurement designs in this gallery.

From the project

USB & SPI Interface for FS9721-based Multimeters (TP4000ZC)

Do you have a cheap Chinese multimeter using the FS9721 chipset and want to add an easy-to-use USB interface to it? Or, do you have an arduino project in mind where you might want to collect measurements from your multimeter? This project can help you do both of those things.

Any multimeter using the FS9721 chipset is compatible, but you may have to adapt the hardware design herein if your multimeter does not have a 3.5mm stereo jack labeled "RS232".

Bullion, from the project README
From the project README

Main components on the Bullion

ATMEGA328P-ASJ1-3524NGCH340G

Bullion bill of materials (BOM)

21 components, 16 distinct parts.

QtyPartRefs
1
ATMEGA328P-A
IC1
1
SJ1-3524NG
U1
1
CH340G
U2
1
Crystal
Y1
1
USB_OTG
P1
1
CONN_01X07
P2
1
BLUE
D2
1
RED
D3
5
0.1u
C1, C2, C5, C7, C8
2
22p
C3, C4
1
47u
C6
1
10k
R1
1
2.2k
R2
1
220
R3
1
82
R4
1
4.7k
R5

Bullion design files

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

Bullion: common questions

What microcontroller does the Bullion use?

The Bullion is built around the ATMEGA328P-A, from the AVR/Arduino family.

How big is the Bullion PCB?

The Bullion measures 38.8 × 27.3 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Bullion?

21 components, from 16 distinct parts. The full bill of materials is listed on this page.

Where can I download the Bullion design files?

From the coddingtonbear/bullion repository on GitHub, which has the KiCad layout; the links under Design files point to each one.

Can I use the Bullion design in my own project?

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

Can I test firmware for the Bullion without the hardware?

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

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