Simple proto board for 8-pin ATtiny chips

Go To Last Post
7 posts / 0 new
Author
Message
#1
  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

Here are details of a simple prototyping board for the 8-pin DIL AVRs:

http://www.leonheller.com/ATtiny...

I had a small batch made by ITead, and one works OK with an ATtiny45. I've provided the design files for anyone else that wants to get some made:

http://www.leonheller.com/ATtiny...

http://www.leonheller.com/ATtiny...

Leon Heller G1HSM

Last Edited: Thu. Oct 3, 2013 - 04:56 PM
  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

Leon, I think your link has too many "W"s...

Ross McKenzie ValuSoft Melbourne Australia

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

Thanks, Ross. I've fixed it.

Leon Heller G1HSM

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

Very nice!

Might be useful to add a place to put a crystal and some caps, with a solder bridge (or through-hole pads for a jumper) on PB3 and PB4.

I note the room for a bypass cap (C1) and a filter cap (C3), but what happened to C2? ;)

JJ

"Experience is what enables you to recognise a mistake the second time you make it."

"Good judgement comes from experience.  Experience comes from bad judgement."

"Wisdom is always wont to arrive late, and to be a little approximate on first possession."

"When you hear hoofbeats, think horses, not unicorns."

"Fast.  Cheap.  Good.  Pick two."

"Read a lot.  Write a lot."

"We see a lot of arses on handlebars around here." - [J Ekdahl]

 

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

I didn't see much point in a crystal, as the internal oscillator is stable enough for most applications.

I removed a regulator and capacitor from an earlier version, and forgot to renumber the capacitors.

Leon Heller G1HSM

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

leon_heller wrote:
I didn't see much point in a crystal, as the internal oscillator is stable enough for most applications.
True enough, but the option would be handy. A 32.768 kHz crystal comes to mind.

It's a great layout nevertheless. Good work!

JJ

"Experience is what enables you to recognise a mistake the second time you make it."

"Good judgement comes from experience.  Experience comes from bad judgement."

"Wisdom is always wont to arrive late, and to be a little approximate on first possession."

"When you hear hoofbeats, think horses, not unicorns."

"Fast.  Cheap.  Good.  Pick two."

"Read a lot.  Write a lot."

"We see a lot of arses on handlebars around here." - [J Ekdahl]

 

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

Hi Leon,
Boards like this are very useful for development/prototyping work.
I had started on a similar board for the Attiny85 (until I got distracted by another project).
I also dispensed with the idea of an external crystal.
Here are/were some of my ideas
I included a 78L05 for VCC. (Although I plan to change it for a LDO SMD so that amongst other things I can easily substitute a 3.3V regulator)
I made the PCB 5cm X 5cm. to get them manufactured by Seeed Studio getting the best dollar/cm2. ($10 for 10 5cm. X 5cm. boards == 4 cents/cm2)
I added some mounting holes, because securing these small boards is alway a hassle.
I did agonize over whether an ISP socket should be included.
My thoughts were NO, if a socketed DIP was used or YES if SMD was used.
Every available spare area has a PAD as it costs no more!

Additional consideration for the board design (although that is starting to go away from simple) could be would be
a)to choose the dimensions to suit a common small enclosure.
b)to include some pads for mounting say a SD card or bluetooth radio socket and/or DS1B20 etc.

My application was for a garden/orchard watering system!

Charles Darwin, Lord Kelvin & Murphy are always lurking about!
Lee -.-
Riddle me this...How did the serpent move around before the fall?