N-key-rollover is a software complication not normally encountered in a simple scanning scheme and is best avoided. That's my conclusion. The alternat...

To throw some light on the subject: a disability chord keyboard.

I agree. I've painted a simplistic picture of the concept. It's way more complex than that. Also, I should add, in keeping with the robotic nature of ...

@dronebot-workshop Thanks, Bill. I'll get back to you on how it works out in practice.

I think I've answered my own question. The solution is for the servos to sweep 90 degrees, not 180.

Re-reading my post above in reply to mday, I should've made it clear I'm just a self-taught amateur, both then and now. 29 years at Apple - now that's...

G'day, Baz.

Digital systems were my entry level back in '82. Then micros. Hardware was the thing. Now it's software and micro-miniaturisation. You're right, Mark....