I build projects with Arduino and Espruino. I've designed dozens of circuit boards for these projects.

I maintain the ATTinyCore, megaTinyCore and DxCore hardware packages for Arduino.

PROTOTYPING BOARD
Strip Board, Protoboard, prototyping board, solderable breadboard - whatever you want to call it - has been a mainstay in electronics prototyping for decades, and hasn't changed much in the interim (not even in production quality, as they're still often single-sided and/or manufactured from low-grade phenolic resin instead of FR4).

My prototyping board creations bring these into the modern era, offering a combination of 0.1" through-hole prototyping areas (consisting of groups of 2, 3 or 4 pins connected together, like solderable breadboard) and pads for common surface mount packages connected to through-holes for easy soldering.

I offer prototyping board between 4" x 4" to less than an inch square in my Mini Protoboard line. Unlike most commercial prototyping board, these boards are made to the same quality standards as real PCBs. Through-holes are plated and the boards are double sided.

These are offered in both generic versions, and ones tailored to specific microcontrollers, like the Tiny84/85, or microcontroller boards, like the Espruino Pico, Arduino Pro Mini, and the wildly popular ESP8266.

ATTINY BREAKOUT BOARDS:
I love the ATtiny lineup, particularly some of the less popular ones, like the incredibly full-featured ATtiny841, ATtiny1634, and ATtiny828. Breakout boards for these that had the features I wanted were not readily available - so I made my own. I've since expanded my product line to include breakout boards for the ATtiny861, ATtiny167, and ATtiny88 - and all of these are available both as bare boards and assembled. In addition to designing the hardware I also maintain [ATtinyCore Universal](https://github.com/SpenceKonde/ATTinyCore), which enables Arduino support for all these ATtiny's and more.

OTHER BOARDS:
I also sell a number of other boards to fill gaps in the market, including a breakout board for the popular LoRa/LoRaWAN modules from Microchip (the RN2483 and 2903), which has become one of my top selling items.

I also sell MOSFET drivers and breakout boards for logic level MOSFETs operating at logic levels as low as 1.8v. These are almost invariably SMD parts which are difficult to use without a properly designed breakout board. Azduino offers boards with modern and high performance FETs.

Azduino by Spence Konde's Page SpenceKonde