An Orange Pi has an integrated microcontroller that may be used for
stepping to >400KHz. It already does what you are mentioning internally.
I haven't explored how fast that it can read encoders yet for closed loop.
On 8/15/20 3:46 AM, Chris Albertson wrote:
What are you missing? THe Orange Pi is not a microcontroller. It is a
small size PC. It runs Linux and acts like a PC, I microcontroler is a
single chip with a much less powerful CPU and memory measured in Kilo and
mega bytes, not gigabytes. And they don't run Linux.
The Orange Pi or a PC is OK for open loop stepper moter based systems but
can't handle a rotary shaft encoders without help. It also, no matter how
good it is, there is jitter in the timing. To get past this most people
will use a Mesa Card of some type.
But rather then Mesa, what about a $3 SMT32 based card, or several of
them? Then if done right you would not need the real-time version of
Linux. The system would be much easier to set up
If you don't need RT Linux then maybe you don't need Linux and a Mac or
Windows or maybe an iPhone could work as long as all the real-time
parts ran on these microcontrollers. Some robots work like this. So
there are many examples.
So what you are missing is the suggestion was not to replace the Linux-PC
(or Linux-Pi) with a micro controller but rather create another external
real-time board from a mass produced product.
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