servo pulse-to-pwm chip
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Posts: 46,084
Just found this guy in the UK:
http://www.omegaco.demon.co.uk/mechome.htm
He sells some hobbyist bits, including an 8 pin PIC programmed to
read a servo pulse from an RC Rx, and output motor control pwm
(actually, FET control PWM) on one pin, and a relay fwd/rev signal on
another. 5 pounds ($7.50).
In a lot of applications, full FET bridges aren't really needed; a
DPDT relay can do the occaisonal direction reversal, and a single FET
can control motor current.
I already have an ESC in a model boat (see the Sanguine at
http://www.geocities.com/y2patmat/ ), which was built by another
party using this chip. Works fine, and lower cost than any other 20A
ESC out there.
Since Stamps are worthless for continuous PWM output (shame, that),
I'll use my BS to read a 2 ch Rx, do some algorithm, and output servo
pulses to control 3 of these things (for my triple screw PT boat) and
a rudder servo...
PM
http://www.omegaco.demon.co.uk/mechome.htm
He sells some hobbyist bits, including an 8 pin PIC programmed to
read a servo pulse from an RC Rx, and output motor control pwm
(actually, FET control PWM) on one pin, and a relay fwd/rev signal on
another. 5 pounds ($7.50).
In a lot of applications, full FET bridges aren't really needed; a
DPDT relay can do the occaisonal direction reversal, and a single FET
can control motor current.
I already have an ESC in a model boat (see the Sanguine at
http://www.geocities.com/y2patmat/ ), which was built by another
party using this chip. Works fine, and lower cost than any other 20A
ESC out there.
Since Stamps are worthless for continuous PWM output (shame, that),
I'll use my BS to read a 2 ch Rx, do some algorithm, and output servo
pulses to control 3 of these things (for my triple screw PT boat) and
a rudder servo...
PM