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A PCB for the ATtiny85

General purpose. About $3.

(Filename: ATtiny-breakout-PCB271.htm)

I've created a small (about $3) PCB for the ATtiny 85 (and similar 8 pin ATtiny's, too, of course.

I've also, by mistake, created this page TWICE. Sigh. The Other Version has bits this doesn't, and vice versa. The board has come back from OSH Park. Not yet tested, but looks fine.

((q-alt text for image))

There are two pads intended for a 0.15" pitch screw terminal connector. (You can, of course, just solder wires directly to the pads. This connector is for the Vcc and ground connections.

They connect to pins 8 and 4 of the ATtiny. In future, I will indicate the pin associations thus: ((8)) and ((4)).

GPIO lines PB0 and PB1, ((5)) and ((6)) are brought to two pairs of pads 0.1" apart, the other pad in each pair connecting to ground. These are easily supplied with pins and linking "hats", if you want to use PB0 and PB1 for feature-selecting in your application. Or the pads can be used for connecting wires to off-board devices.

PB5 and Reset ("Not-Reset", strictly speaking, of course!)- ((pin 1)) is brought to another pair of pads 0.1" apart, the other pad connecting to ground.

Five pins down! Three GPIO lines to go!....

The board can carry a resistor, an LED, and a self-oscillating piezo buzzer. (You could leave either or both out.) If you choose to incorporate them (or something similar, of course), they would be driven by PB3 ((2)).

The other two GPIO pins, PB2 and PB4 ((7)), ((3)), occupy two positions in a row of five pads 0.15" apart, intended for a 5 way screw terminal. Two of the other positions connect to the circuit's ground, and the remaining position carried Vcc from the board.

A picture is, of course, worth a thousand words, so here's 2,000 worth. If they are unclear in your browser, right-click on them, use "Save image as...", and view them with a simple image viewer, e.g. the excellent free one from IrfanView.com.

Project status

I drew the schematic, designed a PCB (using the excellent KiCad) 2/18. I made one up, by hand, it worked. 3/18 I placed an order for three boards with the excellent OSH Park. Though I probably tempt fate... what could go wrong with such a simple board?

It your are interested in obtaining one, with the tiresome components, if you wish, please get in touch. Board? About $3. Parts? At my cost. I can't send one "instantly", but the level of interest will determine the level of energy I put into the next phase. Sound like vaporware? No, not really. A close cousin, perhaps... but I am not a commercial operation. Just a hobbyist with a "day job", etc. (Contact details below.)

image: Schematic of ATtiny breakout board
image: Heart of schematic of ATtiny breakout board
image: PCB of ATtiny breakout board

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In addition to the tutorials for which this page serves as Table of Contents, I have other sites with material you might find useful.....

Sequenced set of tutorials on Arduino programming and electronics interfacing.
Tutorials about the free database supplied with Open Office version 2.
      (If you experienced Adabas with Star Office, ooBase is nothing like it!)
Some pages for programmers.
Using the parallel port of a Windows computer.

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