So after taking onboard advice from here more than a few months back now, I've had a couple of false starts, some fire, more smoke, a bit of luck, and a lot of excitement all come together into an Arduino Nano style device.. And it works well.
It's a shade larger than a Nano, but includes: - Integrated half-h-bridge good for about 20a continuous / 80a motor stalls / 150a or so pulses across 2s - 5s LiPO batteries. PWM on the low side. - VRM to supply MCU and accessories power off the LiPO with additional stuff to avoid brownouts - Voltage divider to read the current battery voltage (for low voltage shutdown, as well as battery specific tuning) - CH340 USB bridge - Break-out pads for an external USB cord.
I have a set of libraries developed to handle things like the battery monitoring, half-bridge control (incl deadtime), etc. Plus example code of common usage scenarios.
The use case is primarily modified Nerf blasters. I tend to swap a variety of high kv BLDC flywheel motors into them and use a variety of high speed / high torque motors, or solenoids to provide auto cycling so it's a real time saver to have an integrated unit.. But having an integrated package available makes advanced mods more accessible for those who can solder up a switch, but feel intimidated by soldering up a pile of discrete semicondutors.
Here's the first samples of a running unit. A couple of small hardware niggles that will be resolved in my next run.
Comparison to a Nano clone
And a video demo https://www.youtube.com/watch?v=NqOpOENbAMQ
Thanks again for the help.