Week 6 Lab - Revision history

Rtwomey: /* Homework */

2009-05-18T19:14:58Z

‎Homework

Rtwomey: /* Homework */

2009-05-09T19:34:47Z

‎Homework

Rtwomey at 16:15, 5 May 2009

2009-05-05T16:15:07Z

Rtwomey: Week 6 moved to Week 6 Lab

2009-05-05T16:12:59Z

Week 6 moved to Week 6 Lab

Rtwomey: /* Controlling the speed AND direction of a motor */

2009-05-05T16:08:34Z

‎Controlling the speed AND direction of a motor

Rtwomey: /* Controlling the speed AND direction of a motor */

2009-05-05T16:05:34Z

‎Controlling the speed AND direction of a motor

Rtwomey: /* Moving a solenoid */

2009-05-05T15:58:22Z

‎Moving a solenoid

Rtwomey: /* Controlling the speed AND direction of a motor */

2009-05-05T15:57:43Z

‎Controlling the speed AND direction of a motor

Rtwomey: /* Moving a Servo */

2009-05-05T15:56:28Z

‎Moving a Servo

Rtwomey: /* Controlling the speed AND direction of a motor */

2009-05-05T15:53:38Z

‎Controlling the speed AND direction of a motor

@@ Line 89: / Line 89: @@
 Over the course of the next two weeks, we are going to do a mid-term project.  Consider it a rehearsal for the final.  Your mission: find an object and control it.  This could be a toy (see Robosapien example below), a car, a clock (see clock example below), a blender (see blender example below).  For this week's homework, you will identify the object you want to control, and write up a preliminary diagram describing how you will control it.  A block diagram or flow diagram is a good example: are there inputs coming from sensors, into the microprocessor?  If so, put them in the diagram.  What are the actuators that are going to produce the output: motors + servos for moving parts, lights for blinking parts (are we bored with this yet), sound, smells.  Think expansively!  Can you make something bigger than 4x4x4 feet?  Something heavier than you are?
-This is going to be a two week project, and a rehearsal for the final.  We are going to get our first ideas out of our system with this project, letting you either build on this project or go in a new direction for the final.  E-mail me if you are concerned whether or not your idea is feasible.  But plan to come to class next week with three things:
+This is going to be a two week project, and a rehearsal for the final.  We are going to get our first ideas out of our system with this project, letting you either build on this project or go in a new direction for the final.  E-mail me if you are concerned whether or not your idea is feasible.  Please post these three things to your User page on the wiki:
 # A written proposal (2 paragraphs)

@@ Line 87: / Line 87: @@
 ASSIGNMENT:
-Over the course of the next two weeks, we are going to do a mid-term project.  Consider it a rehearsal for the final.  Your mission: find an object and control it.  This could be a toy (see Robosapien example below), a car, a clock (see clock example below), a blender (see blender example below).  For this week's homework, you will identify the object you want to control, and write up a preliminary diagram describing how you will control it.  A block diagram or flow diagram is a good example: are there inputs coming from sensors, into the microprocessor?  If so, put them in the diagram.  What are the actuators that are going to produce the output: motors + servos for moving parts, lights for blinking parts (are we bored with this yet), sound, smells.  Think expansively!  Can you make something bigger than 4x4x4'?
+Over the course of the next two weeks, we are going to do a mid-term project.  Consider it a rehearsal for the final.  Your mission: find an object and control it.  This could be a toy (see Robosapien example below), a car, a clock (see clock example below), a blender (see blender example below).  For this week's homework, you will identify the object you want to control, and write up a preliminary diagram describing how you will control it.  A block diagram or flow diagram is a good example: are there inputs coming from sensors, into the microprocessor?  If so, put them in the diagram.  What are the actuators that are going to produce the output: motors + servos for moving parts, lights for blinking parts (are we bored with this yet), sound, smells.  Think expansively!  Can you make something bigger than 4x4x4 feet?  Something heavier than you are?
-This is going to be a two week project, and a rehearsal for the final.  We are going to get our first ideas out of our system with this project, letting you either build on this project or go in a new direction for the final.  E-mail me if you are concerned whether or not your idea is feasible.  But plan to come to class next week with a written proposal (2 paragraphs), some diagrams, and the thing you want to control.
+This is going to be a two week project, and a rehearsal for the final.  We are going to get our first ideas out of our system with this project, letting you either build on this project or go in a new direction for the final.  E-mail me if you are concerned whether or not your idea is feasible.  But plan to come to class next week with three things:
-Next week, in class, we will consider your projects in small groups, and come up with technical implementations (i.e. what circuits/chips/devices do you need) to make your project work. This project will count for part of your final and as homework, approx 25%.  Final will remain 35%.
+# A written proposal (2 paragraphs)

← Older revision		Revision as of 16:15, 5 May 2009
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	[[Image:Lamp_fader.png]] [[Image:Solenoid_control.jpg\|300px]]		[[Image:Lamp_fader.png]] [[Image:Solenoid_control.jpg\|300px]]
		+
		+	== Switching a Relay ==
		+
		+	WHY: For really high current loads. To interface digital logic (5V) and AC powered (120v AC) devices. To control the mythical blender.
		+
		+	Use the same circuit as with the solenoid (i.e. diagram above), simply swap the solenoid with a Relay. An electromechanical relay has a giant wire-coiled magnet inside, same as a solenoid.

	== Moving a Servo ==		== Moving a Servo ==

@@ Line 22: / Line 22: @@
 You will also need to run +12V, +5V and GND from the arduino to your breadboard.  The two grounds (at the top and the bottom row of your breadboard) will still need to be tied together, as usual.
-[[Image:12vpower_off_arduino.jpg|300px]] [[Image:12vpower_to_breadboard.jpg|300px]]
+[[Image:12vpower_off_arduino.jpg|300px]] [[Image:12vpower_to_breadboard.jpg|300px]] [[Image:Common_ground.jpg|300px]]
 # Connect PWM output (pin 9) to Pin 1 on L293. This is the Enable (EN) input.  PWM here will turn on/off the motordriver, accomplishing speed control.

← Older revision		Revision as of 16:05, 5 May 2009
Line 19:		Line 19:

	[[Image:External_power.jpg\|300px]]		[[Image:External_power.jpg\|300px]]
		+
		+	You will also need to run +12V, +5V and GND from the arduino to your breadboard. The two grounds (at the top and the bottom row of your breadboard) will still need to be tied together, as usual.
		+
		+	[[Image:12vpower_off_arduino.jpg\|300px]] [[Image:12vpower_to_breadboard.jpg\|300px]]

← Older revision	Revision as of 16:12, 5 May 2009
(No difference)

@@ Line 32: / Line 32: @@
 Use the same high-current load driver circuit (with TIP120) from earlier labs.  The diagram below, substituting the Solenoid for the lamp in the diagram below.  Also, you will need to hook up external power, +12V instead of +5V to drive the solenoid.
-[[Image:Lamp_fader.png]]
+[[Image:Lamp_fader.png]] [[Image:Solenoid_control.jpg|300px]]
 == Moving a Servo ==

@@ Line 16: / Line 16: @@
 [[Image:Arduino_serialtest.png|200px]]
-Cautions: powering off of external power supply (12V instead of USB power 5V).
+Caution: powering off of external power supply (12V instead of USB power 5V). This means you need to move the power select jumper from "USB" to "EXT", and connect your +12V supply to the power jack.
 # Connect PWM output (pin 9) to Pin 1 on L293. This is the Enable (EN) input.  PWM here will turn on/off the motordriver, accomplishing speed control.

@@ Line 39: / Line 39: @@
 Set up potentiometer input
-[[Image:Pot_in]]
+[[Image:Pot_in.png]]
   // potentiometer_servo

@@ Line 19: / Line 19: @@
 # Connect PWM output (pin 9) to Pin 1 on L293. This is the Enable (EN) input.  PWM here will turn on/off the motordriver, accomplishing speed control.
-# Make two simple Active High digital input switches, and hook them up to Pins 1A and 2A.  Pressing 1A will spin it one way, pressing 2A will spin it the other way, and both at once will do a "Fast Stop".  This is described in the logic table above. [[Image:D_in.png]][[Image:D_in.png]]
+# Make two simple Active High digital input switches, and hook them up to Pins 1A and 2A.  Pressing 1A will spin it one way, pressing 2A will spin it the other way, and both at once will do a "Fast Stop".  This is described in the logic table above.
 == Moving a solenoid ==