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Attach hexa

uzsito·attach-hexa·kicad_board/attach_hexa.kicad_pcb

Attach hexa PCB layout, top view — open source AVR/Arduino board by uzsito
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About the Attach hexa PCB

Attach hexa is an open source AVR/Arduino PCB design by uzsito, published on GitHub under the GPL-3.0 license. It is a 2-layer board measuring 91.3 × 25.9 mm, with 18 components from 6 distinct parts.

Its main chip is the Arduino_Nano_v3.x, from the AVR/Arduino family. By type, the board carries 6 transistors, 6 resistors, 5 connectors and 1 module.

From the project

Configurable low-cost solution to produce fake cooling fan TACH signals for various computer systems.

With the code uploaded to Arduino, a complete Attach-Hexa is able to drive six computer fan headers (channels) with TACH signals. Users can easily adjust the required RPM simulation on each channel, using pre-defined commands on serial interface.

On most motherboard headers, TACH pin is pulled high (+10-12V) by an internal pullup resistor. As the connected fan rotates, it's own built-in electronics (hall-effect sensor, transistor) pulls the TACH line to GND twice in every revolution. This results in a square-wave with a certain period, which is proportional to the fan's rotation speed. So if…

Attach hexa, from the project README
From the project README

Main components on the Attach hexa

Arduino_Nano_v3.x

Attach hexa bill of materials (BOM)

18 components, 6 distinct parts.

QtyPartRefs
1
Arduino_Nano_v3.x
A1
6
2N3904
Q1, Q2, Q3, Q4, Q5, Q6
2
Conn_01x15_Male
J1, J5
1
TACH
J2
2
Conn_01x15
J3, J4
6
4,7k
R1, R2, R3, R4, R5, R6

Attach hexa design files

The KiCad project lives in the uzsito/attach-hexa repository on GitHub; these links point at the commit this page was built from.

Attach hexa: common questions

What microcontroller does the Attach hexa use?

The Attach hexa is built around the Arduino_Nano_v3.x, from the AVR/Arduino family.

How big is the Attach hexa PCB?

The Attach hexa measures 91.3 × 25.9 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Attach hexa?

18 components, from 6 distinct parts. The full bill of materials is listed on this page.

Where can I download the Attach hexa design files?

From the uzsito/attach-hexa repository on GitHub, which has the KiCad layout; the links under Design files point to each one.

Can I use the Attach hexa design in my own project?

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

Can I test firmware for the Attach hexa 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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