• the boards

    Matthew James Bellafaire02/05/2019 at 01:27 0 comments

    well, got the boards in finally, all 50 of them. soldered up one of the boards and it looks great.

    For what these cost I'm glad I made them. getting one of these ready to go take about 5 minutes of soldering and no time at all to add to a breadboard or protoboard. It's easy enough to program them in-circuit and they are able to take a voltage anywhere from 5v to 15v while also supplying a 5v supply for other circuit elements. it's also worth keeping in mind that these are still relatively inexpensive for what they are, here's the running total: 

    $16.17 for 50 boards (shipping included) = $0.3234

    $1.24 for attiny85 (assuming no bulk pricing) 

    $0.17 for ams1117 (roughly) 

    and lets say $.10 for the capacitors and headers. 

    meaning the entire board start to finish costs $1.83 or just 47% more than a standard attiny85 project. Saving a lot of time that's well worth the cost in this case. 

    I also took a video of one of these running a simple counting program for which the code is included at the bottom. 

    #define F_CPU 8000000
    #include <avr/io.h>
    #include <avr/interrupt.h>
    #include <util/delay.h>
    void init() {
      DDRB |= (1 << PB2) | (1 << PB3) | (1 << PB4) | (1 << PB1);
    int main(void) {
      while (1) {

    see you in the next project! this one's been short and sweet.

  • Overview

    Matthew James Bellafaire01/11/2019 at 02:44 0 comments

    This has been a project I've wanted to do for a while, since I had the time I got around to it. Typically with the ATtiny I find myself using the same basic circuit over and over again. Just to simplify my life i decided to produce that "same basic circuit" as a PCB. The idea is pretty straight forward, add an ICSP header and a voltage regulator then breakout the GPIO pins. 

    In reality I only undertook this project due to how ridiculously cheap getting prototype boards in hand has become recently. From JLCPCB 50 of these boards can be made for $10 so there aren't a lot of downsides to something like this that only saves me some time and trouble. Next update will be when i have these in hand!