Pololu Simple Bedienungsanleitung PDF herunterladen (Seite 42)

Note: The analog channel inputs are not 5V tolerant, so you must not connect voltages over 3.3 V to these

pins. If your control source outputs voltages higher than 3.3 V, you can use a voltage divider to ensure the

voltage is always at an acceptable level.

The channel pins have a 0.1" spacing, which means that a female-female servo extension cable

[http://www.pololu.com/product/780] can be used to connect a potentiometer or analog joystick to the motor controller

board.

Simple Wiring Example: Connecting to a Potentiometer

Wiring diagram for connecting a potentiometer or joystick to a

Simple Motor Controller.

Using the Analog Channels

The Simple Motor Controller is constantly sampling the two analog channels and making the measured voltages

available via the USB and serial interfaces, even when the controller is not in analog mode. For example, you can use

the serial interface to read the analog channel values while the motor controller is in RC mode. The analog channels

are read with 12-bit (0.8 mV) resolution.

Driving a Motor

In analog mode, the channel values are mapped to motor speed based the channel calibration values and the mixing

mode. We recommend your first step after connecting your analog voltage source be to use Quick Input Setup Wizard

in the Simple Motor Control Center. The wizard instructs you to move your inputs to their extremes and maps one

extreme to the maximum forward motor speed, the neutral position to speed zero, and the other extreme to maximum

reverse speed. Calibration can have a significant impact on performance.

If mixing mode is disabled, only channel 1 affects motor speed. If mixing mode is set to “right” or “left”, channel 1

is considered the “throttle” input and channel 2 is considered the “steering” input. Left mixing mode obtains motor

speed by summing the throttle and steering channels (CH1+CH2) while right mixing mode obtains motor speed

by taking the difference of the throttle and steering channels (CH1-CH2). To see why this makes sense, consider a

differential-drive robot (a robot with a motor on each side) with a left motor driven by a Simple Motor Controller

in left mixing mode and a right motor driven by a Simple Motor Controller in right mixing mode. When throttle is

4. Connecting Your Motor Controller Page 42 of 101

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Pololu Simple Bedienungsanleitung Seite 42