Page 54
Creating your own motor
Tools Needed
•
Soldering Iron
•
Wire clipper
•
Wire stripper
•
Hot melt glue gun or heat source for heat shrink tubing
•
Razor knife or sharp scissors
Supplies needed
•
1 x 3 male header, 0.1” (2.54mm) spacing
•
Small gauge stranded wire (28 AWG ribbon cable works best)
•
Solder
•
DC Motor (5V or more, with less than 1A current draw - max motor port power is 5V))
•
Insulating material (like hot glue or heat shrink)
Method
As for sensors ports, the KIPR Link DC motor interface employs standard 0.1” (2.54mm) female headers.
Each pair of motor ports is a dual 1 x 3 female header strip serviced by a dual H-bridge chip for PWM.
The outside two positions (pins 1 and 3) provide the DC poles for driving a motor (analogous to using a
battery). For Pin 1 negative (
-
) and Pin 3 positive (
+
) the green motor light is lit when the motor is
powered. If the polarity is reversed (Pin 1
+
and Pin 3
-
) then the red motor light is the one lit. By
convention, the polarity that lights green is "forward" and the one that lights red is "backward"
(remember that if the connection is reversed, the motor simply runs in the opposite direction, so
"forward" is a relative term). The middle pin is internally connected to pin 1 but it is best to not use it
since the Pin 1/Pin 3 plug can't be plugged in wrong.
When choosing a motor, be aware that supply voltage is regulated by PWM (Pulse Width Modulation),
which has a non-linear response curve in providing an effective voltage level that ranges from 0 to 5V.
The BEMF PID (Back Electro Motive Force, Proportional Integral Derivative) control system for PWM
Pin 3 – Opposite polarity of Pin 1
Pin 2 – not used
Pin 1 – Opposite polarity of Pin 3
Содержание KIPR Link
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