A few weeks ago I launched a brand new modular flight control system. Instead of taking the all-in-one approach, Polystack introduces an open hardware design for stacking mods on top of a base control board. At its core is a high density 80 pin connector which can carry up all of the microcontroller IO to the mods that need it. They are now available from the Chickadee Tech website.
There are a variety of mods available to start and more will be developed over time. Launch mods include FrSky X4R-SB and D4R-II cradles, a Receiver Breakout, a MicroMinimOSD cradle, Dual Serial Breakout and MicroSD. Two flight control boards are available at launch also. One is based on an STMF303 and the other is an STM32F405. Both run Betaflight and have MPU-6000s on board. I'd love to support other flight software in the future too. Unlike Arduino shields, Polystack can stack up to seven mods worry free. So, you can mix and match to achieve the functionality you want.
Right now Polystack is in its early days. My hope is that people can learn how to fix and develop Polystack boards to build a diverse community of boards. Some designs that are being brainstormed are a native PDB, an autonomous flight mod, a native OSD and native VTX.
Boards are now available from Chickadee Tech. They are perfect for building your own custom rig the way you want or developing a ready to fly with tiered functionality. Feel free to email email@example.com with any questions or comments. Thanks!