NU32: Driving a stepper motor - Revision history

Lynch at 11:39, 16 January 2016

2016-01-16T11:39:02Z

← Older revision		Revision as of 06:39, 16 January 2016
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			'''THIS PAGE REFERS TO A PRE-RELEASE VERSION OF THE NU32 PIC32 DEVELOPMENT BOARD. FOR INFORMATION, SAMPLE CODE, AND VIDEOS RELATED TO THE PRODUCTION VERSION (2016 AND LATER), AND TO THE CORRESPONDING BOOK "EMBEDDED COMPUTING AND MECHATRONICS WITH THE PIC32 MICROCONTROLLER," VISIT [[NU32\|THE NU32 PAGE]].'''


	Driving a unipolar stepper motor using the TB6612 H-bridge and the NU32		Driving a unipolar stepper motor using the TB6612 H-bridge and the NU32

2012-03-06T16:21:07Z

Overview

← Older revision		Revision as of 11:21, 6 March 2012
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	== Overview ==		== Overview ==

			More information about stepper motors can be found [[Stepper Motor Theory\| here]], [[Stepper Motor Circuits\| here]], and [http://en.wikipedia.org/wiki/Stepper_motor here].

	The stepper motor included in the NU32 motor kit is a unipolar stepping motor with 95 ohms per half coil and a 7.5 degree per step size. It has a 3:25 gearhead, so the output shaft will make 1 revolution after 400 steps.		The stepper motor included in the NU32 motor kit is a unipolar stepping motor with 95 ohms per half coil and a 7.5 degree per step size. It has a 3:25 gearhead, so the output shaft will make 1 revolution after 400 steps.

2012-03-06T16:00:26Z

Overview

← Older revision		Revision as of 11:00, 6 March 2012
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	To make the motor step, we need to turn on the coils in a specific order. We need to have positive current or negative current going through the coils like this:		To make the motor step, we need to turn on the coils in a specific order. We need to have positive current or negative current going through the coils like this:
	<table>		<table border=1>
	<tr>		<tr>
	<td>Coil 1</td><td>Coil 2</td>		<td>Coil 1</td><td>Coil 2</td>

2012-03-06T15:59:37Z

Code

← Older revision		Revision as of 10:59, 6 March 2012
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	The following code, [[Media:NU32_stepper_example.c \| NU32_stepper_example.c]], uses timer 2 to step through the stepping sequence at 25Hz, resulting in 1 revolution of the output shaft ever 16s. Press and hold the USER button to reverse direction.		The following code, [[Media:NU32_stepper_example.c \| NU32_stepper_example.c]], uses timer 2 to step through the stepping sequence at 25Hz, resulting in 1 revolution of the output shaft ever 16s. Press and hold the USER button to reverse direction.

			Try increasing the frequency of timer 2. At above 100Hz stepping (1 rev per 4s), my motor starts missing steps, and at 100Hz has almost no torque. Increasing the battery voltage would allow you to increase the motor speed and torque.
	Try increasing the frequency of timer 2.

	== Details ==		== Details ==

2012-03-06T15:54:21Z

Code

← Older revision		Revision as of 10:54, 6 March 2012
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	== Code ==		== Code ==
			The following code, [[Media:NU32_stepper_example.c \| NU32_stepper_example.c]], uses timer 2 to step through the stepping sequence at 25Hz, resulting in 1 revolution of the output shaft ever 16s. Press and hold the USER button to reverse direction.

			Try increasing the frequency of timer 2.

	== Details ==		== Details ==

2012-03-06T15:50:37Z

← Older revision		Revision as of 10:50, 6 March 2012
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	== Wiring ==		== Wiring ==
	[[Image:NU32_stepper_wireup.png\|thumb\|600px\|center]]		[[Image:NU32_stepper_wireup.png\|thumb\|600px\|center]]

			== Code ==


	== Details ==		== Details ==

2012-03-06T15:49:52Z

Overview

@@ Line 4: / Line 4: @@
 == Overview ==
 [[Media:TB6612.pdf|H-Bridge datasheet for driving the stepper motor]]
 == Wiring ==

2012-03-03T20:26:13Z

Overview

← Older revision		Revision as of 15:26, 3 March 2012
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	== Overview ==		== Overview ==

	[[Media:TB6612.pdf\|~~Datasheet~~]]		[[Media:TB6612.pdf\|H-Bridge datasheet for driving the stepper motor]]

	The TB6612 is a MOSFET based motor driver.		The TB6612 is a MOSFET based motor driver.

2012-03-03T20:24:39Z

← Older revision		Revision as of 15:24, 3 March 2012
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	The TB6612 is a MOSFET based motor driver.		The TB6612 is a MOSFET based motor driver.

		⚫	== Wiring ==
		⚫	[[Image:NU32_stepper_wireup.png\|thumb\|600px\|center]]

	== Details ==		== Details ==
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	[[Image:TB6612.png\|thumb\|600px\|The TB6612 logic table\|center]]		[[Image:TB6612.png\|thumb\|600px\|The TB6612 logic table\|center]]


⚫	== Wiring ==
⚫	[[Image:NU32_stepper_wireup.png\|thumb\|600px\|center]]

2012-03-03T20:24:26Z

← Older revision		Revision as of 15:24, 3 March 2012
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	[[Image:TB6612.png\|thumb\|600px\|The TB6612 logic table\|center]]		[[Image:TB6612.png\|thumb\|600px\|The TB6612 logic table\|center]]

			== Wiring ==
			[[Image:NU32_stepper_wireup.png\|thumb\|600px\|center]]