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2 layers49.5 × 22.9 mmT85-with driver, the printed circuit board in 3D

T85-with driver

cnlohr/ethertiny133

A firmware-only half-duplex 10Base-T implementation for AVRs

Size
49.5 × 22.9 mm
Copper layers
2
Thickness
1.6 mm
Parts
11
Nets
19
Pads
79
Tracks, vias
375, 9
Pours
2
Routed
Yes
KiCad
KiCad 3
Created
28 Aug 2014
Updated
8 Oct 2024

Overview

T85-with driver is an open-source printed circuit board by cnlohr, from the cnlohr/ethertiny repository on GitHub. It is a 2-layer board of 49.5 × 22.9 mm with 11 parts on 19 nets, routed with 375 tracks and 9 vias.

It is built around the ATTINY85-15M. Its parts include 5 connectors, 2 ICs, 1 capacitor and 1 resistor. It belongs with the AVR (ATmega, ATtiny) boards of this library.

Main components

1

README

README.md

WARNING

This is a really dangerous project. Use at your own risk.

By directly ethernet without magnetics to an AVR, you may cause serious damage, fire, or anything else crazy if there is a DC offset. It does not follow 802.3 standards for 10Base-T Ethernet

It has two projects in it: t85: uses differential signaling with fixed packets, similar to another person's project, igorplug, found here: http://www.cesko.host.sk/IgorPlugUSB/IgorPlug-USB%20%28AVR%29_eng.htm

t85spi: uses the USI, and can send/receive arbitrary packets.

Schematics are in the "hardware/" folder.

See the youtube video for more info:

T85 Video: http://youtu.be/mwcvElQS-hM

T85spi Video: http://youtu.be/m4f4OzEyueg

Paper on T85spi is found in the "paper/" folder.

Copyright (C) 2014 <>< Charles Lohr

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Parts

11
QtyValueFootprintReferences
1.1uNETWORK1206CN1
110uSM0805C2
12.2kSM0805R1
149.9NETWORK1206RN1
1ATTINY85SO8WIDEU1
1AVRISP6RIBBON6SMTJ1
1EXTCONPHOENIX1935187P3
1EthertinySMT_ETHERNETP1
1RS485-ISL3170SO14EU2
1S553-5999-52BELFuse-S553T1
1~632HOLEP4

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Questions

How big is the T85-with driver PCB?

It measures 49.5 × 22.9 mm and has 2 copper layers, 1.6 mm thick.

What parts does the T85-with driver use?

11 parts, built around the ATTINY85-15M. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.

Where can I download the T85-with driver KiCad files?

From the cnlohr/ethertiny repository on GitHub, at the commit this page was made from: the board is hardware/t85-with-driver.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.

Can I use the T85-with driver design in my own project?

Its repository states no licence, so its author keeps all rights: ask cnlohr before reusing the design.