4 hbridges with closed loop control.
Just means a closed loop feedback system.
In this case you get more procise control.
It looks like a nice kit. The xrc I suspect adds another processor ,
most likely another arm7 chip
also have a look at the gamepark32
similar size but more powerful cpu than the gameboy advanced
You can find the compiler and cables to allow you to write programs and
gameboy / gba without needing the fpga addon.see
The charmlabs addon , xport, has an fpga as well
So you would want to learn either vhdl or verilog
to be able to write a program for the fpga.
You can use the schematic tool that comes with the xilinx webpack
but it gets annoying and painfull for larger designs.
also limits you a lot compared to using a hdl (hardware drescription
You can download the xilinx webpack for free after registering(also free).
www.xilinx.com/webpack also get modelsim .
not a small download.
If you added an output board with optocouplers and
other more powerful drive stage you could use this to control
much larger robots.
Use the bluetooth and another gb or gba and control
from up to 100m.
This "back-EMF" business sounds sophisticated to me. But then again
I've only recently started to look around again. I'm not sure how
they can measure the motor position using the same wires that power
the motor though.
I've played with some industrial controllers awhile back and know that
feedback control is a good thing. If you can wrap a PID loop around
these motors (which is what they claim) it starts getting interesting
Some motors come with a "tachometer" which basically means generator. It
will output a pseudo-sine wave which you can square up and then count
using your MCU's pulse accumulator to roughly determing RPMs.
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