4 open source boards using the 4021
Real designs built with the 4021, from public GitHub projects: a quick way to see how others power, decouple and connect it. Each board comes with its KiCad files, full parts list and a render — and you can simulate its firmware on HardLabs.
Kivu12
ohmtech-rdi
59.6 × 109.5 mm135 parts2LCC-BY-SA-4.0405
Arduino stoerbert
MichaelThessel
67.8 × 101.5 mm32 parts2LNo license35
Chisel nes
shino-hinaduki
100 × 100 mm108 parts2LGPL-3.04
AVR/ArduinoInterface
ksmonkey123
85.1 × 62.9 mm30 parts2LMIT1
The 4021 in open source designs
The gallery holds 4 open source boards using the 4021 from 4 GitHub repositories; a typical one measures about 76.4 × 100.8 mm and carries around 70 components.
100% are two-layer designs, the rest use four layers or more, and 75% carry an open source license.
The most starred is Kivu12 by ohmtech-rdi.
Microcontrollers on boards using the 4021
What boards using the 4021 are built for
4021: common questions
Where can I find a 4021 reference design?
Each of the 4 boards on this page is a real design using the 4021. Open one to see how it is wired up, with the full BOM, a render of the layout and links to its KiCad files.
Which microcontrollers do boards using the 4021 use?
Most are built on AVR/Arduino (1).
How big is a typical board using the 4021?
The median is 76.4 × 100.8 mm, and 100% are two-layer designs.
What is the most popular open source board using the 4021?
By GitHub stars, Kivu12 by ohmtech-rdi, with 405 stars.
Can I simulate one of these boards using the 4021 before building it?
Yes. HardLabs turns a board's netlist and BOM into a working simulation, so you can boot and test firmware against it with no hardware on your desk.