3 open source boards using the HW-221
Real designs built with the HW-221, 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.
Ttl to rs485-proto
HydroVinci-PULV
86.4 × 58.4 mm5 parts2LGPL-3.011
Ttl to rs485
71.1 × 44.5 mm4 parts2LGPL-3.011
Ttl to rs485-stoopid
62.2 × 44.5 mm4 parts2LGPL-3.011
The HW-221 in open source designs
The gallery holds 3 open source boards using the HW-221 from 1 GitHub repository; a typical one measures about 71.1 × 44.5 mm and carries around 4 components.
100% are two-layer designs, the rest use four layers or more, and 100% carry an open source license.
The most starred is Ttl to rs485-proto by HydroVinci-PULV.
What boards using the HW-221 are built for
HW-221: common questions
Where can I find a HW-221 reference design?
Each of the 3 boards on this page is a real design using the HW-221. Open one to see how it is wired up, with the full BOM, a render of the layout and links to its KiCad files.
How big is a typical board using the HW-221?
The median is 71.1 × 44.5 mm, and 100% are two-layer designs.
What is the most popular open source board using the HW-221?
By GitHub stars, Ttl to rs485-proto by HydroVinci-PULV, with 11 stars.
Can I simulate one of these boards using the HW-221 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.