All you need to drive a DC motor is simply some kind of transistor. The
Arduino cannot provide enough current, that is all. With stepper motors,
it's a bit more complicated since there is a forward and a reverse
pulse. Also, if you want to be able to change the direction of the DC
motor, then you will need to use some sort of H-Bridge IC to switch the
direction of the DC current. IIRC, the H-Bridge simply take High or Low
to one pin to switch the current from positive-flowing to
negative-flowing. If you only want one direction for your stepper, you
could try just sending PWM via a transistor to one leg of the stepper
and see what happens ;-)
I'm sure others have less Neanderthal suggestions, but these could get
your started.
D.
JNM wrote:
Salut
We are in Dakar, Sénégal, for the second PD/XXXduino workshop in west
Africa where we prototype a suitcase for the pedagogy of interactive
art.(( http://www.craslab.org/valise (draft, english soon)))
We try to find a solution to control the stepper motor and dc motor with
PD standard firmata 2.1 with the adafruitmotorshield. Servomotors are
easy to pilot from PD, but steppers and DC motor are piloted by a chip.
The docs says (http://www.ladyada.net/make/mshield/faq.html):
"The DC/Stepper motors are NOT connected to the Arduino directly. They
are connected to the 74HC595 latch which is spoken to by the Arduino.
You CANNOT talk directly to the motors, you MUST use the motor shield
library"
Does anyone in the list has found a hack to talk to this chip from PD to
pilot the steppers and DC motors ?
Thanks
JNM, Jérôme Abel, and 17 Senegalese and Malian students
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