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Usbcounter

swharden·USB-Counter·builds/2.1/usbcounter/usbcounter.kicad_pcb

Usbcounter PCB layout, top view — open source AVR/Arduino board by swharden

About the Usbcounter PCB

Usbcounter is an open source AVR/Arduino PCB design by swharden, published on GitHub under the MIT license. It is a 2-layer board measuring 91.4 × 60.9 mm, with 45 components from 24 distinct parts.

Its main chip is the ATTINY826-XUR, from the AVR/Arduino family. Other key parts include the FT230XS, SN74LVC1Gxx, MCP23008-xSO, 74LV8154 and NCP1117 3.3V. By type, the board carries 14 resistors, 12 capacitors, 7 ICs, 4 connectors, 4 diodes and 1 transistor.

From the project

Open-source USB frequency counter

Design around FT231 (not FT230) for improved supply chain availability PCB labels for R5 and C2 are reversed ICs need dot near pin 1 favor USBC port dot for oscillator screw holes are too small pins need labels MCU programming pins are wrong - this chip only supports UPDI * Frontend sucks. Check out better buffer frontends.

Usbcounter, from the project README
From the project README

Main components on the Usbcounter

ATTINY826-XURFT230XSSN74LVC1GxxMCP23008-xSO74LV8154NCP1117 3.3V

Usbcounter bill of materials (BOM)

45 components, 24 distinct parts.

QtyPartRefs
1
ATTINY826-XUR
IC1
1
FT230XS
U1
1
SN74LVC1Gxx
U2
2
MCP23008-xSO
U3, U6
1
74LV8154
U4
1
NCP1117 3.3V
U5
1
MMBT2222A
Q1
1
ECS-TXO-3225MV-147.4-TR
14.7456 MHz TCXO
Y1
1
UJ2-MIBH-G-SMT-TR
J1
1
SMA
J2
1
Conn_Prog
J3
1
Conn_Disp
J4
1
Jumper
JP1
1
STATUS
D1
2
D
D2, D3
1
POWER
D4
1
Ferrite
FB1
9
.1u
C1, C4, C5, C6, C7, C8, C9, C10 +1
2
47p
C2, C3
1
.1u
C11
Show 4 more
QtyPartRefs
1
50
R1
9
10k
R2, R4, R7, R9, R10, R11, R12, R13 +1
2
100k
R3, R8
2
27
R5, R6

Usbcounter design files

The KiCad project lives in the swharden/USB-Counter repository on GitHub; these links point at the commit this page was built from.

Usbcounter: common questions

What microcontroller does the Usbcounter use?

The Usbcounter is built around the ATTINY826-XUR, from the AVR/Arduino family.

How big is the Usbcounter PCB?

The Usbcounter measures 91.4 × 60.9 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Usbcounter?

45 components, from 24 distinct parts. The full bill of materials is listed on this page.

Where can I download the Usbcounter design files?

From the swharden/USB-Counter repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Usbcounter design in my own project?

Yes, under the terms of its MIT license, which swharden chose for the repository.

Can I test firmware for the Usbcounter 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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