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Persistence of Vision (POV) Wands are a fun way to create interesting long exposure photographs and light displays.  The wand consists of a single row of LEDs controlled by an Arduino Uno.  When the wand is turned on it appears to be flickering in a random pattern, but if you move it quickly back and forth, you will see text or an image appear.  This wand project is incredibly customizable, I've included all CAD files, firmware, build documentation, and schematics.  Feel free to choose your own color LEDs, write personalized messages, and maybe even add something new to the project!



Parts list:

(1x) Arduino Uno REV 3 Radioshack #276-128
(20x) Amber Super-bright LED Indicator Radioshack #55050630
(1x) Arduino Proto Shield Radioshack #276-140
(1x) 9V Alkaline Battery Radioshack #23-866
(1x) Heavy-Duty 9V Snap Connectors Radioshack #270-324
(20x) 1/4 watt resistors (sample calculation below)

      from the specs of the LEDs I used:
      "Continuous forward current: 25mA"
      "Forward voltage: 3V"

      using the following relationship:
      V(volts) = I(amps) * R(ohms)
      rearranged to:
      R = V / I

      we can calculate the resistance as follows:
      voltage across resistor = 5V - 3V = 2V
      2V / 0.025A = 80ohms

      I used 100 ohm resistors so that the LEDs wouldn't be operating at their maximum ratings.  Check the datasheet of the LEDs you use to calculate these values.

I've attaching a fritzing document with a breadboard and schematic view of the circuit (and included them above) for reference.
 
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NickM339 days ago
Is there any way to make a longer wand? I haven't used arduinos before.
zack19561013 days ago

This is a really cool project!

rajatnegi14 days ago
Codes are not verifying in arduino uno. Please can you send me a correct code at my email address. rajatnegi108@gmail.com
fariyahc made it!23 days ago

it work perfectly on arduino 1.0.6 but new arduino version 1.6.5 not support it. plz correct this problem.

thank you.

my camera is not a good one ;)

Screenshot_2015-08-11-10-14-38.png
fariyahc23 days ago

hi amanda

i got a problem (error message) when uploading the program in arduino 1.6.5
can you fix it?

Arduino: 1.6.5 (Windows 7), Board: "Arduino Uno"

E:\Program Files (x86)\Arduino\hardware\tools\avr/bin/avr-g++ -c -g -Os -w -fno-exceptions -ffunction-sections -fdata-sections -fno-threadsafe-statics -MMD -mmcu=atmega328p -DF_CPU=16000000L -DARDUINO=10605 -DARDUINO_AVR_UNO -DARDUINO_ARCH_AVR -IE:\Program Files (x86)\Arduino\hardware\arduino\avr\cores\arduino -IE:\Program Files (x86)\Arduino\hardware\arduino\avr\variants\standard C:\Users\CHATHU~1\AppData\Local\Temp\build7179824887335632129.tmp\FYP1LVPH0OJ0IKJ.cpp -o C:\Users\CHATHU~1\AppData\Local\Temp\build7179824887335632129.tmp\FYP1LVPH0OJ0IKJ.cpp.o

In file included from FYP1LVPH0OJ0IKJ.pde:26:0:
FYP1LVPH0OJ0IKJ.pde:79:19: error: variable 'letterA' must be const in order to be put into read-only section by means of '__attribute__((progmem))'
FYP1LVPH0OJ0IKJ.pde:102:19: error: variable 'letterB' must be const in order to be put into read-only section by means of '__attribute__((progmem))'
FYP1LVPH0OJ0IKJ.pde:125:19: error: variable 'letterC' must be const in order to be put into read-only section by means of '__attribute__((progmem))'
FYP1LVPH0OJ0IKJ.pde:148:19: error: variable 'letterD' must be const in order to be put into read-only section by means of '__attribute__((progmem))'
FYP1LVPH0OJ0IKJ.pde:171:19: error: variable 'letterE' must be const in order to be put into read-only section by means of '__attribute__((progmem))'
FYP1LVPH0OJ0IKJ.pde:194:19: error: variable 'letterF' must be const in order to be put into read-only section by means of '__attribute__((progmem))'
FYP1LVPH0OJ0IKJ.pde:217:19: error: variable 'letterG' must be const in order to be put into read-only section by means of '__attribute__((progmem))'
FYP1LVPH0OJ0IKJ.pde:240:19: error: variable 'letterH' must be const in order to be put into read-only section by means of '__attribute__((progmem))'
FYP1LVPH0OJ0IKJ.pde:263:19: error: variable 'letterI' must be const in order to be put into read-only section by means of '__attribute__((progmem))'
FYP1LVPH0OJ0IKJ.pde:286:19: error: variable 'letterJ' must be const in order to be put into read-only section by means of '__attribute__((progmem))'
FYP1LVPH0OJ0IKJ.pde:309:19: error: variable 'letterK' must be const in order to be put into read-only section by means of '__attribute__((progmem))'
FYP1LVPH0OJ0IKJ.pde:332:19: error: variable 'letterL' must be const in order to be put into read-only section by means of '__attribute__((progmem))'
FYP1LVPH0OJ0IKJ.pde:355:19: error: variable 'letterM' must be const in order to be put into read-only section by means of '__attribute__((progmem))'
FYP1LVPH0OJ0IKJ.pde:378:19: error: variable 'letterN' must be const in order to be put into read-only section by means of '__attribute__((progmem))'
FYP1LVPH0OJ0IKJ.pde:401:19: error: variable 'letterO' must be const in order to be put into read-only section by means of '__attribute__((progmem))'
FYP1LVPH0OJ0IKJ.pde:424:19: error: variable 'letterP' must be const in order to be put into read-only section by means of '__attribute__((progmem))'
FYP1LVPH0OJ0IKJ.pde:447:19: error: variable 'letterQ' must be const in order to be put into read-only section by means of '__attribute__((progmem))'
FYP1LVPH0OJ0IKJ.pde:470:19: error: variable 'letterR' must be const in order to be put into read-only section by means of '__attribute__((progmem))'
FYP1LVPH0OJ0IKJ.pde:493:19: error: variable 'letterS' must be const in order to be put into read-only section by means of '__attribute__((progmem))'
FYP1LVPH0OJ0IKJ.pde:516:19: error: variable 'letterT' must be const in order to be put into read-only section by means of '__attribute__((progmem))'
FYP1LVPH0OJ0IKJ.pde:539:19: error: variable 'letterU' must be const in order to be put into read-only section by means of '__attribute__((progmem))'
FYP1LVPH0OJ0IKJ.pde:562:19: error: variable 'letterV' must be const in order to be put into read-only section by means of '__attribute__((progmem))'
FYP1LVPH0OJ0IKJ.pde:585:19: error: variable 'letterW' must be const in order to be put into read-only section by means of '__attribute__((progmem))'
FYP1LVPH0OJ0IKJ.pde:608:19: error: variable 'letterX' must be const in order to be put into read-only section by means of '__attribute__((progmem))'
FYP1LVPH0OJ0IKJ.pde:631:19: error: variable 'letterY' must be const in order to be put into read-only section by means of '__attribute__((progmem))'
FYP1LVPH0OJ0IKJ.pde:654:19: error: variable 'letterZ' must be const in order to be put into read-only section by means of '__attribute__((progmem))'
variable 'letterA' must be const in order to be put into read-only section by means of '__attribute__((progmem))'

fariyahc23 days ago
ruonear2 months ago

i also had the same issue even with the Arduino IDE 1.6.5. change all the boolean variables to const boolean variables. it will work ! :)

signup1 ruonear1 month ago

plz give me the .hex file for atmega8 i have a atmel board.. with isp programmer plz

we must use 1.0.5 version it is good.., the next versions cannot be used. thoose will show some errors.

still giving error "text overflowed by xxxx bytes".

Please help

signup11 month ago

can u plz send me the .hex file of this project.. I'm using the avr board with atmega8. i'v tried a lot with atmel studio 6 to get the hex file but it doesnt works .. so plz send me the .hex file for atmega8 @ yashusharma093@gmail.com plz... Thnku

ashishmarch122 months ago

This Code isn't compiling with Arduino 1.0.5.

I am using Arduino with AtMega8.

It is Showing this error.

Can you help?

Capture.JPG

hi ashish once check the digital and analog pins of atmega8. and give properly in code. then it can works..,

BollisettiS2 months ago

hi.., the project is good.., there are some mistakes in program. after the last for loop some lines must be commented or else it will not shows more then one letter. plkease check it.

1101Snehil2 months ago

hey author i made a prototpe without using the resistors. everything else is same. When i run the sketch by usb power it works well but when i use a fully chaged 9 v battery, it runs for sometime and then reboots and after that whenever the code starts running it again reboots. To see it work correctly again, i have to wait for atleast ten minutes. Then when the code runs, the same problem persists. Is it due to not adding resistors? If so then is there a way to add them onto this prototype without desoldering and resoldering it? (Like on the ground wire or something else)

Hi guys, i wanted to somehow change the Pin connections order, but i think i need the library to do that, does someone have the library so that i can change that?

ftj106 months ago

@amandaghassaei can you give me the working code cause i cant run my program there are to many error when I try to compile my codes

Paste here the error log. Before you do that try to replace "boolean" to "const boolean" in all the code, it worked for me in this way.

here's the code that occured after i changed the values,.

Arduino: 1.6.1 (Windows XP), Board: "Arduino Uno"

Build options changed, rebuilding all

FYP1LVPH0OJ0IKJ.ino:678:49: error: 'sendToWand' declared as function returning a function

FYP1LVPH0OJ0IKJ.ino:706:49: error: 'sendToWand' declared as function returning a function

FYP1LVPH0OJ0IKJ.ino:734:49: error: 'sendToWand' declared as function returning a function

FYP1LVPH0OJ0IKJ.ino:762:49: error: 'sendToWand' declared as function returning a function

FYP1LVPH0OJ0IKJ.ino:790:49: error: 'sendToWand' declared as function returning a function

FYP1LVPH0OJ0IKJ.ino:818:49: error: 'sendToWand' declared as function returning a function

FYP1LVPH0OJ0IKJ.ino:846:49: error: 'sendToWand' declared as function returning a function

FYP1LVPH0OJ0IKJ.ino:874:49: error: 'sendToWand' declared as function returning a function

FYP1LVPH0OJ0IKJ.ino:902:49: error: 'sendToWand' declared as function returning a function

FYP1LVPH0OJ0IKJ.ino:930:49: error: 'sendToWand' declared as function returning a function

FYP1LVPH0OJ0IKJ.ino:959:49: error: 'sendToWand' declared as function returning a function

FYP1LVPH0OJ0IKJ.ino:987:49: error: 'sendToWand' declared as function returning a function

FYP1LVPH0OJ0IKJ.ino:1017:49: error: 'sendToWand' declared as function returning a function

FYP1LVPH0OJ0IKJ.ino:1046:49: error: 'sendToWand' declared as function returning a function

In file included from FYP1LVPH0OJ0IKJ.ino:26:0:

FYP1LVPH0OJ0IKJ.ino: In function 'void sendToWand(const boolean*)':

FYP1LVPH0OJ0IKJ.ino:1081:33: error: 'letterArray' was not declared in this scope

FYP1LVPH0OJ0IKJ.ino:1085:33: error: 'letterArray' was not declared in this scope

FYP1LVPH0OJ0IKJ.ino:1089:33: error: 'letterArray' was not declared in this scope

FYP1LVPH0OJ0IKJ.ino: At global scope:

FYP1LVPH0OJ0IKJ.ino:1103:51: error: 'sendToWand' declared as function returning a function

FYP1LVPH0OJ0IKJ.ino:1131:49: error: 'sendToWand' declared as function returning a function

FYP1LVPH0OJ0IKJ.ino:1159:49: error: 'sendToWand' declared as function returning a function

FYP1LVPH0OJ0IKJ.ino:1187:49: error: 'sendToWand' declared as function returning a function

FYP1LVPH0OJ0IKJ.ino:1215:49: error: 'sendToWand' declared as function returning a function

FYP1LVPH0OJ0IKJ.ino:1244:49: error: 'sendToWand' declared as function returning a function

FYP1LVPH0OJ0IKJ.ino:1272:49: error: 'sendToWand' declared as function returning a function

FYP1LVPH0OJ0IKJ.ino:1301:49: error: 'sendToWand' declared as function returning a function

FYP1LVPH0OJ0IKJ.ino:1330:49: error: 'sendToWand' declared as function returning a function

FYP1LVPH0OJ0IKJ.ino:1358:51: error: 'sendToWand' declared as function returning a function

FYP1LVPH0OJ0IKJ.ino:1386:49: error: 'sendToWand' declared as function returning a function

Error compiling.

This report would have more information with

"Show verbose output during compilation"

enabled in File > Preferences.

"can you pls!! upload here the program that you used,. the program that is no need to be edited and ready to upload in an arduino"

evandrosite ftj104 months ago

try using an older version of the Arduino IDE

Hi again!! @mergim halimi. I already replace the "boolean" to "const bolean" but theres an error again

Arduino: 1.6.1 (Windows 7), Board: "Arduino Uno"

sketch_mar16a.ino:1:1: error: expected unqualified-id before '/' token

sketch_mar16a.ino:8:15: error: 'povtext' was not declared in this scope

sketch_mar16a.ino: In function 'void loop()':

sketch_mar16a.ino:858:9: error: 'povtext' was not declared in this scope

This is another error ive got can you help me to fix this??. Thank you

try using an older version of the Arduino IDE

Hi!! Did you change anything in thprogram or just the boolean to const boolean??? @mergim halimi
evandrosite4 months ago

Anyone know where I find the library < avr / pgmspace.h ????

you kids are so cool - I love this!~!

Hi guys, im doing this project but i want to change the order of my pin connections, how can i do it in the arduino code?

nrmr22225 months ago

Any One have POV project Report please send to my mail id nrmr2222@gmail.com

please it's urgent......

Hi Amanda, and others, I was wondering if we can upload a code in this project that shows the analog clock or digital clock. ( A beginner in arduino coding ) . Btw I made this, it works great, I just don't know how to make these pics, I tried to record a video but, hmm. not working, I changed the value of the refreshrate but almost the same, any suggestions ??

barrubond6 months ago

Hi Amanda, this project is great!, indeed i chose to replicate it for a school project, we do have a laser cuter, also a CNC Router to cut it out, but I can't see the adobe document to cut the wand :(, Can you tell me where it is? please, if you have the .DXF file it will be great!! Thank you very much, and great job!!

jamesbrosuk6 months ago

superb, i'll be trying this as my first project

Hi Amanda, As I said I worked on your project and it worked, but the problem is I ve to wave the Wand very fast in order to make the Alphabets visible. I even tried changing the delay, not working so fine. Wld you suggest me whether to increase the delay or to decrease to make it more attractive. Thanks in Advance

Amit_Jain7 months ago

Hi Amanda,

I used your code, but made some changes

- I drew some alien faces, ships, star etc...instead of just letters

- I used a Ardiuno Nano v3

- Used just 19 LEDs ( no space for 20th LED on my Circuit board)

http://amitjain1980.blogspot.in/2014/11/magic-wand...

Thanks

Amit

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amandaghassaei (author)  Amit_Jain7 months ago

so cool!

Finished product

IMG_20150129_155805_1422527315517.jpg
iivanovskis made it!1 year ago

Thanks, cool :)

IMG_1196.JPGIMG_1175.JPG
amandaghassaei (author)  iivanovskis7 months ago

just saw this, looks great!

Andrew Cleveland made it!1 year ago

Worked like a charm. Thanks. I saw a similar thing spinning but it was using rgb LEDs and could stream video. It was obviously bought but still pretty impressive.

IMG_7832.jpg
amandaghassaei (author)  Andrew Cleveland7 months ago

nice! yeah this pov stuff can be taken pretty far. It'd be fun to adapt this project to rgb.

remi.longin made it!12 months ago

Thank you from France, Amanda.

I love your projects. Stay happy

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amandaghassaei (author)  remi.longin7 months ago

thanks! looks awesome!

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