PIC PWM Motor Driver - Revision history

NealEhardt: /* Overview */

2009-02-10T18:25:23Z

Overview

2008-07-25T18:56:34Z

2006-07-24T21:17:29Z

2006-07-24T21:16:44Z

PCB Example

2006-07-24T21:13:56Z

Circuit

2006-07-24T19:23:48Z

TO DO

2006-07-24T17:17:12Z

Signal Conditioner (Optional)

2006-07-24T17:08:27Z

Low Power

2006-07-17T20:58:57Z

Signal Conditioner (Optional)

2006-07-17T20:58:39Z

Signal Conditioner (Optional)

@@ Line 1: / Line 1: @@
 ==Overview==
-DO NOT USE THIS PAGE.   USE THE OTHER PWM PAGE.
+DO NOT USE THIS PAGE.   USE [[PIC18F4520: PWM Motor Control|THE OTHER PWM PAGE]].
 This motor controller was designed for use as cheap, simple motor controller for [[Brushed DC Motor Theory|brushed DC motors]].  It uses a [[PIC Microcontroller]] to convert a low-power analog control signal to a [[Pulse Width Modulation|PWM]] duty cycle which is amplified using a full-bridge to drive a motor.  A block diagram of this is shown below.  This document gives the circuitry and programming needed to make such a controller.

@@ Line 1: / Line 1: @@
 ==Overview==
+DO NOT USE THIS PAGE.   USE THE OTHER PWM PAGE.
 This motor controller was designed for use as cheap, simple motor controller for [[Brushed DC Motor Theory|brushed DC motors]].  It uses a [[PIC Microcontroller]] to convert a low-power analog control signal to a [[Pulse Width Modulation|PWM]] duty cycle which is amplified using a full-bridge to drive a motor.  A block diagram of this is shown below.  This document gives the circuitry and programming needed to make such a controller.

@@ Line 50: / Line 50: @@
 Another way around this is to add an enabling input.  Whenever the controller isn't running, the circuit can be disabled so the motors won't be accidentally driven in either direction.
-===PCB Example===
+==PCB Example==
-You can download CircuitMaker and TraxMaker files here for this circuit using the L293.  The PCB design is shown below.  It is not optimized for space, but to be easy to read.  You can edit it as you like.
+You can download CircuitMaker and TraxMaker files here for this circuit using the L293.  The PCB design is shown below.  It is not optimized for space, but to be easy to read.  You can edit it as you like.  It is suited to use with the PC/104 stack.
 * [[media:PIC PWM Circuit Files.zip]]
 [[image:PIC PWM Traxmaker.jpg|center|400px]]
-==Using with PC/104==

@@ Line 52: / Line 52: @@
 ===PCB Example===
-You can download CircuitMaker and TraxMaker files here for this circuit using the L293:
+You can download CircuitMaker and TraxMaker files here for this circuit using the L293.  The PCB design is shown below.  It is not optimized for space, but to be easy to read.  You can edit it as you like.
 * [[media:PIC PWM Circuit Files.zip]]

@@ Line 49: / Line 49: @@
 Another way around this is to add an enabling input.  Whenever the controller isn't running, the circuit can be disabled so the motors won't be accidentally driven in either direction.
+===PCB Example===
+You can download CircuitMaker and TraxMaker files here for this circuit using the L293:
+* [[media:PIC PWM Circuit Files.zip]]
+[[image:PIC PWM Traxmaker.jpg|center|400px]]
 ==Using with PC/104==

@@ Line 56: / Line 56: @@
 ==TO DO==
+# Find out why circuit causes motors to make high-pitch noise.
 # Add "brake" functionality to the PIC.  This will require at least one additional input.  For example, a single digital input pin could cause the motor to "brake" when it's set high.  To "brake", the PIC will have to disable the PWM mode and set the two output pins equal to eachother.
 # Add "sensing" capability for better control.

@@ Line 43: / Line 43: @@
 [[image:PWM PIC Input Conditioner.png|center]]
+[[image:PWM PIC Input Circuit.jpg|400px|center]]
 This circuit can accomodate inputs of either <math>\pm\,</math>5V or <math>\pm\,</math>10V.  The two potentiometers can be adjusted to give the correct gain.  Diodes were added to protect the PIC from too low or too high voltage inputs.

@@ Line 26: / Line 26: @@
 ===Low Power===
-The low-power circuit uses the L293B push-pull driver ([[media:L293.pdf|datasheet]]).
+The low-power circuit uses the L293B push-pull driver ([[media:L293.pdf|datasheet]]).  This circuit can be used for the 6W Maxon motors in the lab.
 [[image:PIC PWM L293.png|center]]
+[[image:PIC PWM L293 CIRCUIT.jpg|center|400px]]
 ===High Power===