That's exactly how the Anvilus ESC worked, except that it was a dual
motor controller. The micro processor controlled two SSRs (one for each
motor), which then fed into two pairs of 40A relays (one pair for each
motor). It was not only an inexpensive solution (about 1/2 the cost of
Dual ESCs at the time), but it worked well for many years and the
individual parts (SSR, Relays, opto-isolators) could be replaced as
needed for repairs.
In the decade or so since the Anvilus Controller was introduced, the
price (and size) of ESCs has decreased to the point where the price
difference isn't very much, so using a pair of Talon ESCs (for example)
is only slightly more expensive than building your own. And, since they
have no moving parts and have more advanced fail-safes built into the
software/hardware, they are more reliable than any homemade controller
can be.
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