MAKE YOUR OWN SLOT MACHINE
COIN
MECHANISMS
CONTROL
SOUND/ VIDEO AND COMPUTERS
Adding sound, video and computers
The simplest and cheapest way to add sound
and video to a slot machine or simulator used to be modified domestic CD and DVD
players. I simply soldered wires to the contacts of the play and next track
buttons to jump between tracks - and switch the power off at the end of each
cycle to reset everything. Some hard disk and flash card 'media players' are now
really cheap (particularly the Emprex, see below) and are a good alternative.
Sound
Boom boxes (CD player,
amp and speakers) cost about £20. There is a delay of about 6 seconds between
power on and it playing, but it is possible to record the first track blank so
the machine just has to skip to the next track when a coin is inserted. You
obviously need some sound software on your computer, and a CD burner to master
your CD.
Another possibility is to run MP3 files on a DV 68 video player (for details see
under video). This manages to keep up to 100 tracks playing at the right
moment, even when they are rapidly and randomly changing, which I find very
impressive. Much cheaper is the V2 music module,
sold by FTDI, with an Arduino controller. I used this on Whack a Banker and it
works really well (about £15 for the Arduino and
£22 for the V2music module) but it needs a bit more programming and electronics
skill.
For amplifying the MP3 sound, 'active' computer speakers are good value. These plug
into the phono audio out sockets of a DVD or media player. A bass speaker and amp with two satellite speakers cost
about £20. It doesn’t matter where the bass speaker is but the tweeters need
to as close to the ears of the people using the machine as possible. This
enables the sound to be easily audible without being played at high volume –
which pollutes the rest of the space (conventional amusement arcades never seem
to have applied this simple lesson).
Video
Video keeps getting cheaper and easier to incorporate. Until recently, I ran the video animation for my simulator rides from set top DVD players. Starting the DVD playing at the same time as the main controller, they keep perfectly in sync as their internal timing circuits are both quartz controlled.
My first simulators ran using the Video CD format. The quality is amazingly good for a frame size of 320x480. Video material has to be converted to MPEG1 format (I used a program called Tempgnc). Then in the menu of your CD burning software you should find an option for video CD, which you can add MPEG1 files into. Set top DVD players automatically start playing track one of a video CD, and will skip to the next track when the next button is pressed.
DVD format is 720x576 pixels so the picture does look sharper. To make a suitable DVD – without a preset ‘menu’ page - does need authoring software like Adobe Encore – not the cheap bundled software that comes with a DVD writer.
Solid state video
players, running from compact flash card memory are more reliable, and the price
has fallen dramatically. I now run most of them with a player called a DV68, made by Medeawiz.
(£165 + £35 for a switch keyboard for accessing 8 different tracks). It works
perfectly. A cheaper option is the Emprex media player (about £30
from CPC), but to get a track to play automatically when the power comes on, you
have to wire into the remote control and send 2 'left' pulses and 2 'play'
pulses to make a video play.
HD TV is now possible, and its good for arcade machines as people are watching the screen close up. However there are many electronic 'hot spots' which degrade the image between the camera and the final edited film on HD TV. Buy everything you need at the same time and try it out quickly so you can send it all back if the final image isn't HD quality. I'm still waiting for things to improve.
Video Monitors
It
is not completely straightforward to get a TV set to switch on and find the
right channel automatically. Most TVs switch on to standby mode, so I add a
delayed pulse timer (RS 365-6993), giving it an initial pulse contact to the channel+
button. Most TVs switch on the channel that
was on when the set was last switched off.
I have tried open frame industrial monitors, which are much more convenient
because they have glass screens and switch on automatically when the power comes
on. The downside is that they are much more expensive and in my experience not
as bright as ordinary TVs. In 2009, 4:3 ratio TV sets are bargains on ebay as
everyone is changing to 16:9.
Computers
I’ve tried incorporating a PC in two coin op machines. In one (the Gene Forecaster), I wired into the mouse button. This simply started a macromedia director movie. The start menu can also be set to launch any program automatically.
In the other machine (my Expressive Photobooth) other I wired external switches to 5 of the keyboard switches. Macros, called actions in photoshop, are then triggered by the keyboard switches. This is a powerful technique which has all sorts of possibilities for making elaborate machines without any programming language skills.
The disadvantages of using home computers is that when something does go wrong, there are so many levels of complexity that it’s very time consuming and expensive tracing faults. Perhaps I should be less pessimistic as the major faults I spent years tracking down weren't buried too deeply. One was simply caused by inadequate cooling – the computer was inside the machine housing. The others were caused by inadequate shielding round the keyboard interface circuit and a buggy Logicec webcam driver. However the enormous amount of time it took to pin down these faults really put me off. I recently rebuilt the Gene forecaster with a video player instead of a computer, and its worked perfectly ever since.