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Lets start off by saying that I am a noob to micro controllers like Arduino. After looking through instructables for a while I saw the things that arduino could do. That is when I realized that I had to get one and learn the whole process of programming. So having said that I will now move onto my first instructable build.

UPDATE!!   IF YOU HAVE UPGRADED TO ARDUINO 1.0 THE WAVE LIBRARY WILL NOT WORK!!! I AM CURRENTLY LOOKING FOR A FIX TO THIS. IN THE MEAN TIME PLEASE USE THE OLDER VERSION OF ARDUINO SOFTWARE OR IF YOU CAN HELP WITH THE FIX PLEASE POST!! 


I decided to create a singing pumpkin display for Halloween. I got the idea from http://www.instructables.com/id/Singing-PumpkinsParallel-Port-Relay-Box/ I did't have a parallel port but I had an arduino, sound shield and lots of patience. I used the song "This is Halloween" from Nightmare Before Christmas, wrote the code and built a relay board. I will go over how I did this later. Even though it took a lot of work the final result is well worth it! Video is posted in last step.

CAUTION!! CAUTION!! CAUTION!! CAUTION!! CAUTION!! CAUTION!! CAUTION!! CAUTION!! CAUTION!! CAUTION!! CAUTION!!

THIS PROJECT DEALS WITH HIGH VOLTAGE. IF YOU ARE NOT CAREFUL YOU COULD GET SERIOUSLY INJURED.
IF YOU ARE NOT COMFORTABLE WITH THAT PORTION OF THE PROJECT, PLEASE GET SOMEONE TO HELP.

Step 1: Things you will need

Things you will need:


Tools:

Drill
Dremel
Solder Iron
Solder
Screwdriver
Utility Knife






Supplies:
Arduino ( I used the uno with smd chip)
Wave shield
8 pumpkins with light socket and cord( the more styles the better )
flicker bulb set ( available at HD Christmas isle)
5 outlets
relays
wire ( low voltage, electrical cord )
Preff board
9 diodes- Vr/50v Io/1A T/R. Mfg P/N: 1N4001
9 10k OHM 5% 1/4W carbon film resistors
9 330 OHM 1/6W carbon film resistors
9 transistors- 600mA 75V NPN ON Semi Bipolar Small Signal Mfg P/N; P2N2222AG
9 leds 3v
Plastic box ( for relay board and outlets )
Small plastic box ( protection for arduino and sound shield )
Masking Tape
Electrical tape
9v wall wart (adapter)



For the relay board set up I needed 9 relays that control 110v. That 's 8 for the pumpkins and 1 for the flicker bulbs that will run In standby mode. The relays I used are 5v input and 110v 12a output. The relays are wired to be controlled by the arduino but they are powered by a wall wart ( transistors are perfect for using a low voltage to control a higher voltage ). The circuit is simple( as you will see in upcoming steps). The arduino sends a signal to the 10k resistor which is connected to the center pin of the transistor. This will use the transistor as a switch to connect the negative from the wall wart to the relay pin by switching the ground.
video blocked by Disney ...fun killers.
Thank you for the great feedback!
Check out some of the hardware these guys have come up with. A great reference for future projects. The wiki is packed full of ideas for DIY lighting controls: <a href="http://www.doityourselfchristmas.com/wiki/index.php?title=Main_Page">WIKI Link</a><br> <br> Also on the forum there is a Halloween sections as well: <a href="http://doityourselfchristmas.com/">DoItYourSelfChristmas</a><br> <br> Enjoy...
This is great. Got my vote.
This is genius!
Love it!

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