cwhaticando.com home DIY • Do it Yourself • Weekend Projects • BIG Projects • LITTLE Projects
become a creator share your how-to about cWhatIcanDo  

 

 

close window

How Do I Share My How-To?

It's really pretty easy, pictures and videos of the steps it takes to complete your project are stored on YouTube and picasaWeb. Once your "final" video is stored on YouTube, your project will show in the listings on the site. All this is controlled by our Creator's Tools. Basically, you start a project by writing up the project idea.

Step 1. Sign up for a free Creator's Account to gain access to the Creator's Tools.

Step 2. Login

Step 3. Push the "Create New Project" button on the Creator's Tools. Make a name (you can change it later) for your project. And describe your plans to use as notes to guide the creation of the steps.

Step 4. When you've finished providing all the steps to your project, shooting the videos and saving to google video via the Creator's Tool Panel, you are ready to write the introductory paragraph with an interesting story of how you did it, or how you do it in the case of a professional services presentation.

Step 5. Last but not least create and upload the video (to YouTube) which is the video that will be used to summarize the project. If you were building a robot, this final video would show the robot running around, doing fun things that will inspire others to create their version of your project.

That's it... Watch the views and ratings for your project pile up along with the sales commissions! Or get a customer because you showed how you remodel a house.

close window

FAQ About Becoming A Creator

Q. Why would I go to all that work, building something, then put it on a website like C What I Can Do? What's the point?

A. Actually, there are a couple of forms for a reward:

  1. You get rated as an author. Lots of good ratings looks good on your resume.
  2. You Make Money!

YOU Make Money when someone buys a part from You, and builds it into Their Version of your project. And, if YOU have a basement full of red leds and build a red led project - we'll send you customers who are inspired to build your blinking light device. If you sell PC boards, you may link to your own sales. Or sell your own kit online through your e-Bay store.

The same with books! We encourage project builders to make books. In fact, CwhatIcanDo is a great place to get rated as an author. 'Betcha get a better deal from your publisher...

Of course, it is possible that your project won't make you any money, because someone built something even cooler than yours (maybe even inspired by your project.) Maybe you just want to show your version of another project... It's done in the spirit of the web: Sharing ideas. And it's fun building a project on your own.


+ Creator's Login:
User Name:
Password:
 
+ Sign Up For Free and Become a Creator:
First Name:
Last Name:
User Name:
Email :
Password:
 

Light A 5X7 LED Matrix with picAxe 18M2      ...     15977 Views
Author's name: weRbots       

This project grew out of an idea I got when I found a couple of 2057 Giant LED Matrix`s. I thought it would be fun to make faces for robots that could monitor the bot like a piece of test gear that sat right on the bot.

I came up with a few ideas for dot matrix "faces" but it wasn`t just ultra-simple to wire in the matrices. They were designed to be driven row/column with the plus lines tied to column and the cathodes individually running out to pins on the display.

Blah... I put it away for a while. Till the other day when the M2 parts arrived to replace the 18X part I blew up while fiddling around. Hey! These 18M2`s are pretty amazing. You can find a robot project right here on this site, and other information on the 18M2.

My brain blasted when I realized as a consequence of being able to run four 4mHz processes at the same time, you could run one process at 4 X 4 16mHz. And the chip designers through in a treat, the setFreq m32 command. Now I had some speed, so I dragged out the 2057 and my soldering iron and went to work. The result is a dandy little 5X7 display that is crammed in behind the display so you could, if you wanted, stack `em in a message display.

Thus this project was born!

It is cool!
It is Cheap!

What a great project for CwhatIcanDo makers, hackers and circuit benders!
Schematic     
Here`s the way I wired it. I`m including this plus the software just so you can trouble shoot. I recommend you take the other wiring approach so there will be a relationship between the numbers on the picAxe chip (B.0, C.0) and the row numbers.

SOFTWARE LISTING:



``````````````````````````````````````````````````
` Faces for Robots
` Uses picaxe 18M2 to create a face screen for robots
`
` Rel 1.0
` Needs serial interface to program
` Analog Input for data logging/comparison
` Digital Input for pcm control, or ser port for motor ctl
` Extra Output if you choose to chain more displays
` Uses: stopped, forward, turn signals, battery,
` Non-Robot uses: Walking Letters 90 degree rotation,
`
`
`--------------------------------------------------
` PicAxe 18M2
`
` Pinout and Definition of Legs
` By Functional Definition
`=======================================
`(SRI / Out / In) B.0 leg 6 `
`(i2c sda / Touch / ADC / Out / In) B.1 leg 7 `
`(hserin / Touch / ADC / Out / In) B.2 leg 8 `
`(pwm / Touch / ADC / Out / In) B.3 leg 9 `
`(i2c scl / Touch / ADC / Out / In) B.4 leg 10 `
`(hserout / Touch / ADC / Out / In) B.5 leg 11 `
`(pwm / Touch / ADC / Out / In) B.6 leg 12 `
`(Touch / ADC / Out / In) B.7 leg 13
`---------------------------------------
`(Touch / ADC / Out / In) C.0 leg 17 `
`(Touch / ADC / Out / In) C.1 leg 18 `
`(DAC / Touch / ADC / Out / In) C.2 leg 1 `
`(SRQ / Out) Serial Out / C.3 leg 2* `
`(In) / Serial In / C.4 leg 3* `
`(In) old reset is now signal C.5 leg 4
`(Out / In) C.6 leg 15 `
`(Out / In) C.7 leg 16 `
`=======================================
`
`----------````````````````````````````````------------------
` The ideal wiring will hook it up this way: Your
` programming life will get so much easier
`
` B.0 B.1 B.2 B.3 B.4 B.5 B.6 Row 1 through 7
` C.0 C.1 C.2 C.6 C.7 Col 1 through 5

` ------------------------------------------------------------
` Program Wide Symbols


`Kick Butt! set it for extreme speed,
` sure it`ll eat more batteries, but you`re using rechargables!
setfreq m32

`pins
`here i discovered the importance of naming and wiring appropriately
symbol row1 = B.3 `B.1
symbol row2 = B.0 `B.2
symbol row3 = B.2 `B.3
symbol row4 = B.1 `B.4
symbol row5 = B.4 `B.5
symbol row6 = B.6 `B.6
symbol row7 = B.5 `B.7 gives orderly bit alignment

symbol col1 = C.6 `C.0, C.0
symbol col2 = C.1 `C.7, C.2
symbol col3 = C.2 ` , C.6
symbol col4 = C.7 `C.1, C.7
symbol col5 = C.0 `C.6 so much need -- so few bits

symbol serialOut = C.3
symbol serialIn = C.4

` system inputs : C.5 - pulsin/on_off and B.7 - analog/pulsin/on_off
symbol p_button = C.5
symbol anaIn = B.7

symbol delay = 5000 ` just kept having to make it bigger
symbol disp = 10

` get going: set data direction registers for brute force!
let dirsC = %11000111 ` 1 outputs, 0 inputs
let dirsB = %01111111 ` 1 outputs, 0 inputs

` set up initial values for predictable operation
let pinsC = %11000111 ` make all C outputs Low
let pinsB = %01111111 ` turns the lights off :-)

` KEEP THIS TABLE HANDY
` Font making tools
`w1 = %01000000 ` Column 1
`w1 = %00000010 ` Column 2
`w1 = %00000100 ` Column 3
`w1 = %10000000 ` Column 4
`w1 = %00000001 ` Column 5

`w2 = %01110111 ` Row #1
`w2 = %01111110 ` Row #2
`w2 = %01111011 ` Row #3
`w2 = %01111101 ` Row #4
`w2 = %01101111 ` Row #5
`w2 = %00111111 ` Row #6
`w2 = %01011111 ` Row #7
`w2 = %01111111 ` turns the lights off

` For my next act, I will simply OR these babies then blip
` `em a screenful at a time??? Nice experiment.

hello:
for b0 = 1 to 30
gosub H
pause 100
next b0
for b0 = 1 to 30
gosub E
pause 100

next b0
for b0 = 1 to 30
gosub el

pause 100
next b0
`letter space time eater
for b0 = 1 to 30
gosub zero

pause 100
next b0

for b0 = 1 to 30
gosub el

pause 100
next b0
for b0 = 1 to 30
gosub O

pause 100
next b0
`word space
for b0 = 1 to 100
gosub zero

pause 100
next b0

world:
for b0 = 1 to 30
gosub W
pause 100
next b0
for b0 = 1 to 30
gosub O
pause 100
next b0
for b0 = 1 to 30
gosub R
pause 100
next b0
for b0 = 1 to 30
gosub el
pause 100
next b0
for b0 = 1 to 30
gosub dee
pause 100
next b0
`word space
for b0 = 1 to 100
gosub zero

pause 100
next b0


goto hello

H:
let pinsC = %01000000 ` Cols High to enable Rows
let pinsB = %00000000 ` light row
pause disp
gosub zero
let pinsC = %00000010 ` Cols High to enable Rows
let pinsB = %01111101 ` light row
pause disp
gosub zero
let pinsC = %00000100 ` Cols High to enable Rows
let pinsB = %01111101 ` light row
pause disp
gosub zero
let pinsC = %10000000 ` Cols High to enable Rows
let pinsB = %01111101 ` light row
pause disp
gosub zero
let pinsC = %00000001 ` Cols High to enable Rows
let pinsB = %00000000 ` light row
pause disp
gosub zero

return

E:
let pinsC = %01000000 ` Cols High to enable Rows
let pinsB = %00101001 ` light row
pause disp
gosub zero
let pinsC = %00000010 ` Cols High to enable Rows
let pinsB = %01011100 ` light row
pause disp
gosub zero
let pinsC = %00000100 ` Cols High to enable Rows
let pinsB = %01011100 ` light row
pause disp
gosub zero
let pinsC = %10000000 ` Cols High to enable Rows
let pinsB = %01011100 ` light row
pause disp
gosub zero
let pinsC = %00000001 ` Cols High to enable Rows
let pinsB = %00111001 ` light row
pause disp
gosub zero
return

el:
let pinsC = %01000000 ` Cols High to enable Rows
let pinsB = %01111111 ` light row
pause disp
gosub zero
let pinsC = %00000010 ` Cols High to enable Rows
let pinsB = %01111111 ` light row
pause disp
gosub zero
let pinsC = %00000100 ` Cols High to enable Rows
let pinsB = %00000000 ` light row
pause disp
gosub zero
let pinsC = %10000000 ` Cols High to enable Rows
let pinsB = %01011111 ` light row
pause disp
gosub zero
let pinsC = %00000001 ` Cols High to enable Rows
let pinsB = %01011111 ` light row
pause disp
gosub zero
return


O:
let pinsC = %01000000 ` Cols High to enable Rows
let pinsB = %00101001 ` light row
pause disp
gosub zero
let pinsC = %00000010 ` Cols High to enable Rows
let pinsB = %01011110 ` light row
pause disp
gosub zero
let pinsC = %00000100 ` Cols High to enable Rows
let pinsB = %01011110 ` light row
pause disp
gosub zero
let pinsC = %10000000 ` Cols High to enable Rows
let pinsB = %01011110 ` light row
pause disp
gosub zero
let pinsC = %00000001 ` Cols High to enable Rows
let pinsB = %00101001 ` light row
pause disp
gosub zero

return


zero:
let pinsB = %01111111 ` turns the lights off :-)
return




W:
let pinsC = %01000000 ` Cols High to enable Rows
let pinsB = %00000000 ` light row
pause disp
gosub zero
let pinsC = %00000010 ` Cols High to enable Rows
let pinsB = %00111111 ` light row
pause disp
gosub zero
let pinsC = %00000100 ` Cols High to enable Rows
let pinsB = %01101111 ` light row
pause disp
gosub zero
let pinsC = %10000000 ` Cols High to enable Rows
let pinsB = %00111111 ` light row
pause disp
gosub zero
let pinsC = %00000001 ` Cols High to enable Rows
let pinsB = %00000000 ` light row
pause disp
gosub zero

return
R:
let pinsC = %01000000 ` Cols High to enable Rows
let pinsB = %00001001 ` light row
pause disp
gosub zero
let pinsC = %00000010 ` Cols High to enable Rows
let pinsB = %01111011 ` light row
pause disp
gosub zero
let pinsC = %00000100 ` Cols High to enable Rows
let pinsB = %01111110 ` light row
pause disp
gosub zero
let pinsC = %10000000 ` Cols High to enable Rows
let pinsB = %01111110 ` light row
pause disp
gosub zero
let pinsC = %00000001 ` Cols High to enable Rows
let pinsB = %01111011 ` light row
pause disp
gosub zero

return
Dee:
let pinsC = %01000000 ` Cols High to enable Rows
let pinsB = %00101101 ` light row
pause disp
gosub zero
let pinsC = %00000010 ` Cols High to enable Rows
let pinsB = %01011011 ` light row
pause disp
gosub zero
let pinsC = %00000100 ` Cols High to enable Rows
let pinsB = %01011011 ` light row
pause disp
gosub zero
let pinsC = %10000000 ` Cols High to enable Rows
let pinsB = %01011011 ` light row
pause disp
gosub zero
let pinsC = %00000001 ` Cols High to enable Rows
let pinsB = %00100000 ` light row
pause disp
gosub zero

return
Programming Your LED Matrix     
It`s pretty simple. You have to keep refreshing this to fool the eye into thinking all the lights are lit at once. Really, all the Row Leds are what light up at any one time. Comment out the SETFREQ command and you can watch it run slowly...

Make the column you want to energize a logic one... on a picAxe you can say high C.0, for example.

While you hold the high state on the column select the rows that should be on.
For "H", you would turn all rows high in col 1, counting left to right:
LOW Row1,Row2,Row3,Row4,Row5,Row6,Row7 or, if you use the suggested schematic:
let pinsB = %00000000

When column 1 shows up, it simply lights up all the LEDs in a row by shorting through a 47 Ohm resistor. Remember you are pulsing the LED`s so you can hit them with more current at once, they are only on for 1/5 the time anyway.

You can imagine with all seven rows Low, and all seven LEDs lit, things will get dimmer in that column. That`s why the setFreq m32 command is in there, everything happens so fast, you hardly notice the flickering (in the video, things are actually running slow at times).

If you still can`t let go of the math, you will still have problems with brighter bars appearing where there is only one or two LED`s in the stream. To fix this, you would need a constant current generator to supply 10ma to only one LED, and jack up the voltage to supply 10ma more each time another LED is called into service.

In the real world there will be limits, and I originally started out here just to make faces, these work great and I simply keep refreshing the face so it looks like all the dots are on all the time to human`s who are watching. For this, the cheap and dirty approach works great...
Next Steps N Suggestions     
I`m gonna see if I get a picAxe 20m2 to replace the 18 pin model. Or maybe a 28m2? I like the 20 because it`s very inexpensive. I think I want one of those. And, I think I will drive more matrices either by using the extra pins to enable the other matrices.

I`ll put a voltage divider into the analog input and use the value to choose "how happy" the face really is....
become a creator
close window

It's Easy To:

C - What - I - Can - Do

• Sign up - Get ID and Password

• Plan and Create a Project That Someone Might Enjoy and May Even Want to Build

• Link to your creation on your favorite social networking site or blog.

• Become famous! Because your projects get a lot of Hits!

 

No parts list with this project. Scan the 'Junkbox Reviewer' below! Find projects by clicking on their parts. Got something in your junkbox? Here's your spot to find something fun to make or build!

 

Junk Box Reviewer
Itching To Start Building A DIY Do It Yourself Project? Got Some Parts of Your Own in your JunkBox? Find projects by Surfing' the Parts List!
  
  
  
  
  
 
Andrei And Jim
Web Developers
Visit the project:

CwhatIcanDo Website


 
  
  
 
L 298 Compact Motor Driver Kit
Solarbotics
Visit the project:

Build the L298 H-Bridge Motor Control


 
  
 
Account On CwhatIcanDo
CwhatIcanDo.com
Visit the project:

HELP :: How To Create a Project


 
  
  
 
Microrobot Avoider Jr
Microrobot
Visit the project:

Robot Man: With Robot Demos


 
  
  
  
 
Brilliant Blue/Green LED
Surplus
Visit the project:

Converting a Flashlight to LED


 
  
 
PICAXE 8 Pin Motor Driver Board
SparkFun
Visit the project:

Easy Cheap Robot Weekend Project


 
  
 
Tracked Vehicle Chassis Kit
Tamiya
Visit the project:

Build Your Own Track Drive Robot


 
  
  
 
PICAXE 8 Pin Motor Driver Board
SparkFun
Visit the project:

Build Your Own Track Drive Robot


 
  
 
Infrared Proximity Sensor Short Range - Sharp GP2D120XJ00F
Sharp
Visit the project:

Build Your Own Track Drive Robot


 
  
 
PICAXE 8 Pin Motor Driver Board
SparkFun
Visit the project:

Build a Robot In 5 Minutes


 
  
 
Infrared Proximity Sensor Short Range - Sharp GP2D120XJ00F
Sharp
Visit the project:

Build a Robot In 5 Minutes


 
  
 
Gear Motor 2 - 224:1 Offset Shaft
SolarBotics
Visit the project:

Build a Robot In 5 Minutes


 
  
 
4 X AA Cell battery holder plus on/off switch
Powerize
Visit the project:

Build a Robot In 5 Minutes


 
  
 
PICAXE 8 Pin Motor Driver Board
SparkFun
Visit the project:

picAxe 8 bit Motor Controller: Look Inside


 
  
 
Infrared Proximity Sensor Short Range - Sharp GP2D120XJ00F
Sharp
Visit the project:

picAxe 8 bit Motor Controller: Look Inside


 
  
 
4 Section In-Ground Batting Net
battingnets.com
Visit the project:

Home Installation of a 4 Section In-Ground Batting Cage


 
  
  
  
  
  
  
  
 
Transformer 1k:8 ohm
xicon
Visit the project:

Pong)))))


 
  
 
PICAXE 8 Pin Motor Driver Board
SparkFun
Visit the project:

Robots Almost Anyone Can Afford


 
  
  
  
 
Morphibian Land Shark
Kid Galaxy
Visit the project:

Morphibian Land Shark


 
  
  
  
  
  
  
 
Parallax (Futaba) Continuous Rotation Servo
futaba (modified)
Visit the project:

How To Build a Robot in a Box


 
  
 
Parallax (Futaba) Standard Servo
futaba
Visit the project:

How To Build a Robot in a Box


 
  
  
  
 
PICAXE 8 Pin Motor Driver Board
SparkFun
Visit the project:

Weekend Project: Get Started With Robots


 
  
  
 
L298 Compact Motor Driver
Solarbotics
Visit the project:

Build a Respectable Autonomous Robot


 
  
 
Infrared Proximity Sensor Short Range - Sharp GP2D120XJ00F
Sharp
Visit the project:

Weekend Project: Get Started With Robots


 
  
  
 
PICAXE 18 Pin Power Project Board
picAxe
Visit the project:

Build a Robot From A Power Wheelchair


 
  
 
PICAXE 18M2 Microcontroller
picAxe
Visit the project:

Build a Robot From A Power Wheelchair


 
  
  
  
  
  
 
Solderless Breadboard For Uno
Jameco Valupro
Visit the project:

Arduino Development VS PicAxe Development


 
  
 
USB 2/0Video Capture Device
SIIG
Visit the project:

On Line Neighborhood Watch


 
  
  
  
 
Eurocard IC Pattern
Velleman
Visit the project:

On Line Neighborhood Watch


 
  
 
40 kHz Weatherproof Transducer
Audiowell Electronics
Visit the project:

Pong)))))


 
  
 
PICAXE 18M2 Microcontroller
picAxe
Visit the project:

Autonomous Robot PVC "Pickup Truck"


 
  
 
Power Amplifier
ST Micro
Visit the project:

Pong)))))


 
  
  

By Creators
WeRbots: i-Mon App
WeRbots: Pong)))))
By Keywords
Ajax: battle
Android: battle
BEAM Robots: battle
Convert Your Flashlight to LED: Converting a Flashlight to LED
How To Build Cheap Bots: Robots Almost Anyone Can Afford
How To Build Cheap Bots: How To Build a Robot in a Box
How To Website: CwhatIcanDo Website
How To Website: Tour This Website
Infrared Proximity Sensor: Build Your Own Track Drive Robot
Quick Build Robot: Build a Robot In 5 Minutes
robot bending: Morphibian Land Shark
Robot Motor Control: Buggy Bot: Wire Frame Bot Body
Robot Motor Control: Robot Basics
Robots: Robot Basics
Rumble Bot Conversions: Robots Almost Anyone Can Afford
Select or type in a Keyword: Converting a Flashlight to LED
web 2.0 site: CwhatIcanDo Website
Weekend Project Robots: Easy Cheap Robot Weekend Project

Click To Expand / Contract Menus. View by Creator, Category, Keywords or Number of Views.

©Copyright 2008 - , CwhatIcanDo.com, all rights reserved.