Looking for Ideas & Components

Steve Etter

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Apr 2002
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I am a member of a non-profit organization and I want to build a football based arcade-type game. Since all the cost will come out of my own pocket, keeping those costs as low as possible is of primary importance. What I’m asking for from you guys are ideas for low-cost components of all types. For example, I will need at least eleven (11) large 7-segment displays. I am not adverse to building anything I need, if that’s the most cost effective solution, so that’s always on the table.

The basic idea is to create a game where players throw as many footballs (American footballs, not soccer balls :)) as they can through holes in a target board within 60 seconds. The game will allows two people to compete head-to-head or allow a single player to simply try for a high of score.

I envision the design to have two large target boards (probably 8' tall x 4' wide each). Each target board will have five (5) holes with a sensor behind each that trips when a ball goes through. Four of the five holes are for standard scoring and are of different sizes. The smaller the hole, the greater the value of getting a ball through it. The fifth hole, however, is for your opponent. If a ball goes in this hole, it resets your score to zero. I think this will make head-to-head competition a little more fun!

The 7-segment displays will be grouped in three groups of 3 for “Today’s High Score”, “Player A Score”, and “Player B Score”. Because the competition will be timed (60 seconds) and the four scoring holes will be worth 1, 2, 3, and 6 points, the score totals should never exceed 3-digits. The last two 7-segment displays will be grouped together to create the timer clock. If I can find or make these inexpensively enough, I may even group three more 7-segment displays to create a “All Time High Score”.

So in addition to the 7-segment displays, some of the components I need will be a processor, switches behind the holes, a “Start” pushbutton (I don’t want to use a hole switch activation to start it for head-to-head competitions), a “Reset” pushbutton.

Any thoughts or suggestions are appreciated.
Steve
 
Thanks RoTaTech. I went to the Automation Direct website and used their configuration utility to build a processor. Looks like about $460 for a system with enough I/O to handle everything. That's not too bad, I guess. I think for sensors though, I don't know if I can trust a through beam to be 100%. I'll have to ponder that one. Now I need to find my 7-segment displays.
 
tarik1978 - Thanks. That's a good link. I had originally considered this but didn't understand you could cut the strips to length. If I can find some with a little tighter LED distribution (the ones in the link are 5cm apart), I might try it. I also found a fairly inexpensive 7-segment display, 4.25" x 2.75", for $10 each.

Here is the link to that
 
For comparable pricing, the AutomationDirect P1 controller will give you access to arrays/data statistics. In a CLICK you will have to do the conversion math to emulate arrays.

Do you need all 11 of the 7-segment displays or can you use one per active player and Time and then another display to cycle thru the aggregate values and light a lamp with a label to give context to each cycled value?

something like
[Player A Score]
[Player B Score]
[Time]

then a multi-purpose display that cycles thru
[Today's High Score]
[All-Time High Score]
[*any other value you need*] with an associated label and lamp (LED)
 
Sounds like a fun one Steve.

Here are a couple of sites that have overstock/salvage components for cheap money:

https://www.mpja.com/
https://www.allelectronics.com/

I have found them to be good sources for DIY projects but their stock does change because they are buying up old lots / refurb things.

Heres a guy that made his own large 7 segment display elements (looks like a lot of work...)
http://www.mjblythe.com/hacks/2016/06/diy-large-seven-segment-display/

If you know some python or C, maybe you could use a Raspberry Pi with a PiHat and then you could find an old monitor to use for your display...

When I read your project I also had the thought of making a large display out of LED strings. Good think this guy already had that idea and documented it to boot:
https://www.instructables.com/id/Build-a-huge-7-segments-8-digits-red-LED-display/

And another big DIY 7 segment project...
https://www.instructables.com/id/Giant-Two-Digit-Countdown-Clock/

He's driving the segments directly but you can probably find a driver chip that would let you use i2c bus and then free up the I/O pins for the sensors.

Here's a cool driver https://www.maximintegrated.com/en/app-notes/index.mvp/id/3210
You would have to put transistors where they have the LED segments because of the voltage and current required for driving the LED strips.
 
Last edited:
For comparable pricing, the AutomationDirect P1 controller will give you access to arrays/data statistics. In a CLICK you will have to do the conversion math to emulate arrays.

Do you need all 11 of the 7-segment displays or can you use one per active player and Time and then another display to cycle thru the aggregate values and light a lamp with a label to give context to each cycled value?

something like
[Player A Score]
[Player B Score]
[Time]

then a multi-purpose display that cycles thru
[Today's High Score]
[All-Time High Score]
[*any other value you need*] with an associated label and lamp (LED)
Doubling up is a good thought and clearly a good way to save some money, but for the moment (no money spent so far), I think I want to stay with the dedicated displays plan. It just seems like some of the fun and attention draw would be lost without them.
Sounds like a fun one Steve.

Here are a couple of sites that have overstock/salvage components for cheap money:

https://www.mpja.com/
https://www.allelectronics.com/

I have found them to be good sources for DIY projects but their stock does change because they are buying up old lots / refurb things.

Heres a guy that made his own large 7 segment display elements (looks like a lot of work...)
http://www.mjblythe.com/hacks/2016/06/diy-large-seven-segment-display/

If you know some python or C, maybe you could use a Raspberry Pi with a PiHat and then you could find an old monitor to use for your display...

When I read your project I also had the thought of making a large display out of LED strings. Good think this guy already had that idea and documented it to boot:
https://www.instructables.com/id/Build-a-huge-7-segments-8-digits-red-LED-display/

And another big DIY 7 segment project...
https://www.instructables.com/id/Giant-Two-Digit-Countdown-Clock/

He's driving the segments directly but you can probably find a driver chip that would let you use i2c bus and then free up the I/O pins for the sensors.

Here's a cool driver https://www.maximintegrated.com/en/app-notes/index.mvp/id/3210
You would have to put transistors where they have the LED segments because of the voltage and current required for driving the LED strips.
Cool stuff. Thanks ndzied1. Looks like I have some homework now!
 
I think for sensors though, I don't know if I can trust a through beam to be 100%.

I have used thru-beam sensors on parts being ejected from a press, at a rate of 120 per minute. The parts were about 2" across.

I don't think a football would block the beam and clear it too fast for a normal sensor to respond to it.

Maybe someone here will set one up and time how long a football breaks it (I don't have a set here or a football) I am sure it will be within the scan time of a PLC - and not need a fast input or high speed counter.
 
Maybe you could time the break/make interval and award points (extra credit) for speed of the ball as it passes thru the beam.
 
Maybe you could time the break/make interval and award points (extra credit) for speed of the ball as it passes thru the beam.

You can't assume the football will go through the same way each time. If you ever watch the Dr pepper contests, some of the participants throw them sideways, and win.
 
I have used thru-beam sensors on parts being ejected from a press, at a rate of 120 per minute. The parts were about 2" across.

I don't think a football would block the beam and clear it too fast for a normal sensor to respond to it.

Maybe someone here will set one up and time how long a football breaks it (I don't have a set here or a football) I am sure it will be within the scan time of a PLC - and not need a fast input or high speed counter.
I wasn't really concerned with the sensor/PLC being able to register breakage as much as I was concerned with being certain the ball actually went through the beam. I don't want to put the sensor so close to the opening that partially inserted "almost-but-not-quite" throw is counted, so I know I need to mount whatever sensor back some distance. In other words I don't want false positives or false negatives because of sensor location.
 
How about a sock attached to the back of each hole, after a solid tube about 2/3 the length of a football. Count the ball as it slides down the sock.
 

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