WEBVTT

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♪ Spinnin' Wheel ♪

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We have a new demo for Sensors Converge

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showing closed-loop motor speed control

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with off-axis angle sensing.

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The LEDs on the angle sensor Arduino Shield

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show the motor position.

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These are popular little motors for robotics,
but they have no position feedback.

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That's where the sensor comes in.

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The magnet that comes with the Shield
is mounted on the motor shaft

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for noncontact, off-axis angle sensing.

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Their high sensitivity
allows a wide airgap.

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The blue line is the sensor output;
The green line is the motor drive.

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These motors are tricky to control,

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since the minimum drive increment
produces a large speed change.

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But as you can see,

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the motor is well-controlled
with this sensor.

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The Shield fits on an Arduino Uno,

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and connects to an angle sensor breakout board.

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The sensor is connected to the Arduino
via the Shield.

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The motor is controlled by a PWM output.

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Our online calculator helped us
properly locate the magnet.

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You can download program examples
for the Shield from our GitHub repository.

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We used this program as a starting point:

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And we added
a basic proportional control algorithm.

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The sensor has a ridiculously simple interface.

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These are the parts we use for this demo.

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These unique angle sensors allow
wide airgap off-axis sensing;

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they detect absolute position;

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they're precise;

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they're available with
analog, I2C, or SPI interfaces;

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and they're small, for applications
like the one we demonstrated.

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Click, email or call for more information,

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or visit us at Sensors Converge

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May 5 to 7 in Santa Clara
to see this and other live demos.