The xmas-box has 8 Channels (power outlets) where different light modes can be played: vu meter style, ascending, descending, split, merge, sequence and random. During each song one of these modes is used randomly every 10 seconds (to make the show less monotonous).
I started my research right after Halloween and I came across a couple different options, but I settled with the following combination of hardware : arduino + adafruit wave shield + ioBridge + wifi bridge + solid state relays (SSRs).
The xmas-box is enclosed in a small plastic tool box. I have place it on my deck under a roof ( it is not completely weather proof). The tool box has "3 levels." The bottom is where all the SSRs and AC wiring are located. The middle (the inside tray) contains the wall warts for the arduino (9v), ioBridge (5v) and Wifi Bridge with power. The top level contains the Arduino board, the ioBridge module and the FM transmitter.
This is the first time I lit my house so I was just able to put 3,300 mini lights, 3 spotlights,1 LED Rope, 4 LED (40 led each) branch trees and 1 reindeer. I hope the lights last so I can keep adding each year.
Step 1: BoM - Bill of Materials
Step 2: Relay Setup
You will be dealing with AC power. If you don't feel comfortable or you are not sure how to handle AC, please consult a licensed electrician before starting to wire the relays.
A great advantage of using SSRs instead of mechanical relays is that I did not have to add any diodes, transistors, or resistors. Also since there there is no mechanical dependency the switching will be smoother. I would advise to use a breadboard with 1k resistors and different color LEDs during your prototyping. Then when you are ready you can use the SSRs and real Christmas lights.
The connections are pretty straight forward. I daisy chained the ground coming from the Arduino to each of the 8 SSRs. Then 8 digital outputs from the Arduino were connected to each positive of the 8 SSRs.
I gutted the PowerSquid Power Multiplier and removed the 10 outgoing outlets (5 per PowerSquid) as well as the AC plugs. The 5 outgoing outlets came nicely attached together so I cut one from each that used to power the arduino, ioBridge and Wifi bridge.
I connected all the Neutrals (white) together, all the Grounds (green) and then I took the Live (black) and daisy chained to each of the 8 SSRs. Then I individually wired each SSR Live wires to one of the 8 outlets.
I decided to have two power plugs to make the wiring a bit nicer and less bulky. So basically the SSRs on the left are connected to one wall outlet and the SSRs on the right to the other.
Step 3: Arduino Sketch
You will need the following Arduino Libraries:
- AF_Wave and Wave
- String (formerly TextString)
Here is a run down for the pin connections on the Arduino with WAVE shield on top.
D0(RX) -> ioBridge Serial Board TX
D1(TX )-> ioBridge Serial Board RX
D2-D5 are used by the WAVE shield (they could be changed)
D2 -> LCS
D3 -> CLK
D4 -> DI
D5 -> LAT
xmas-box first 3 channels
D6 -> Channel 1
D7 -> Channel 2
D8 -> Channel 3
FM transmitter ON/OFF
D9 -> 10k resistor -> 2N2222 Base -- Collector and Emitter to FM transmitter switch
SD card WAVE shield communication (cannot be changed)
Gnd -> Relay daisy chain.
5v pin -> FM transmitter positive
Gnd -> FM transmitter ground
Gnd -> ioBridge Smart Serial Board
A0 -> R7 1.5K on the WAVE shield to measure output from amplifier. See image.
Analog pins 1-5 are used as digital out for xmas-box channels
A1 = D15 -> Channel 4
A2 = D16 -> Channel 5
A3 = D17 -> Channel 6
A4 = D18 -> Channel 7
A5 = D19 -> Channel 8
Wave shield speaker (mono) to FM transmitter input
Step 4: IoBridge Configuration
I also created a series of widgets with predefined xmas-box commands for a one-click input.
Here is the syntax to communicate with the xmas-box through serial communication. The semi-colon indicates the end of the command.
Put on queue
Put on queuewith specific light mode
Change light mode
Turn all lights on/off
Turn individual channel on/off
Step 5: FM Transmitter
I'm powering the FM transmitter with the 5v coming out from the Arduino. This would probably not be a good idea if I was powering the Arduino with a 9v battery but since I'm using a wall wart I'm not too concerned.
I am bypassing the ON/OFF switch by connecting a 2N2222 transistor connected to a 10k resistor coming from a digital output from the Arduino. To turn on I just send a fast HIGH/delay/LOW and that's all I need to start the FM transmitter.
I also soldered a wire as an antenna to the ground of the battery power pin.
Step 6: Web Interface
I have 2 main tables:
SONGS - It stores the name and artist of the song
QUEUE - it stores the song requests
Then another jQuery calls my web application REST service and sends the track number. The REST service returns the song name,artists and name of the person that requested the song.
If the song was not on the queue it means that its just looping through the play list. So in this case the requester will be Santa Claus itself! And it will show Santa's current location by retrieving it from http://www.noradsanta.org/ feed.
The page might have a live view and live sound, but I'm still working on that...
Step 7: Alternatives
One of the easiest ways to do an Arduino based light/sound show is by using a combination of Proccessing + Minim+ Firmata. All you need is to have serial communication from your pc to your arduino. These instructables rely on Minim's beat detection and could be adapted for Christmas lights:
LED Dance Room
Music Synchronized LED Pumpkin
Relay board fabrication
You can follow the Arduino Christmas Light Controller Instructable if you prefer to build your own relay board. Note that this will be using mechanical relays instead of SSRs.
Another alternative for the web control part is to have a secondary Arduino with a Ethernet shield or a wi-fi shield (it will be absolutely necessary to have a second Arduino board). But as a side note I really like using the ioBridge module. Their servers manage all incoming/outgoing connections and the Data Feeds and APIs offers great flexibility.
animatedlighting.com (they got a Christmas In A Box 4 channel for $500!!)