2 open source boards using the MAX232N
Real designs built with the MAX232N, 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.
ModbusRTU-Test-Shield
CMB27
68.6 × 53.3 mm40 parts2LCERN-OHL-P-2.01
AVR/ArduinoAll band amp-April-2026
satspares
139.5 × 101 mm142 parts4LMIT0
The MAX232N in open source designs
The gallery holds 2 open source boards using the MAX232N from 2 GitHub repositories; a typical one measures about 104 × 77.2 mm and carries around 91 components.
50% are two-layer designs, the rest use four layers or more, and 100% carry an open source license.
The most starred is ModbusRTU-Test-Shield by CMB27.
Microcontrollers on boards using the MAX232N
What boards using the MAX232N are built for
MAX232N: common questions
Where can I find a MAX232N reference design?
Each of the 2 boards on this page is a real design using the MAX232N. 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 MAX232N use?
Most are built on AVR/Arduino (1).
How big is a typical board using the MAX232N?
The median is 104 × 77.2 mm, and 50% are two-layer designs.
What is the most popular open source board using the MAX232N?
By GitHub stars, ModbusRTU-Test-Shield by CMB27, with 1 stars.
Can I simulate one of these boards using the MAX232N 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.