Sunday, February 28, 2021

AVRISP II adapter to Attiny85


For my hobby projects  I often use Attiny85 chip . Usually first stage of the project is breadboard prototyping. But there is the problem: connecting AVRISP programmer to the chip on the breadboard is not that easy. So I made dedicated  adapter  which allows effortless connection between  AVRISP programmer and Attinny85 chip. 


Adapter is passive: it contains nothing but headers to connect programmer and headers to connect to the chip. Apart of that added LED with resistor to indicate if power is supplied.

Adapter has two set of headers:

  •  one set to connect AVRISP (on the photo on the left)
  • another set to insert into breadboard on top of Attiny85 chip.
LED with resistor added for convince to be sure that power provided to the circuit. Marking on the circuit diagram below corresponds to the photo above.
Here you can see the breadboard with the microchip attached to the power.

I need just put adapter with connected AVRISP II programmer on top of microchip, connect AVRISP programmer to a computer through USB in interface, and start Atmel Studio.  Now I am ready to program.

One may ask why not to buy some breadboard ready ISP header? Indeed for less than one dollar you can get adapter kit at  Adafruit site. It is nicely made and can be used with any AVR device. But to make it work there is need to connect that adapter to a controller with six jumper wires. With my adapter I just need to snap it in place. Obviously, if I want to work with different controller (like  Atmega328), I have to make another dedicated adapter. Still I assume that benefits worth the effort.

Saturday, February 13, 2021

Chessboard Chair

We have a small folded chair with top made out of sawdust wood covered with  plastic . We left it in backyard for some time and it got under the rain. As a result top edges started  to decay with  plastic  partially detached. But surprisingly painted metal frame was intact. I decided to renovate the chair by changing the top. While looking for proper board I have found in our home wooden chess board which did not get much use lately. So unscrewed old top and mounted chessboard instead.  Old chair legs tips (couple of them lost) I replaced with  3/4" chair tips I bought in the local Home Depot. On the photo above you can see the result.

And here is old top. I still keep it. Maybe I can restore it and it will find another usage.