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1  Using Arduino / Sensors / Re: What sensor should I use to detect object going through a hole? on: March 09, 2013, 09:17:23 am
Thanks to everyone for their input. It's most appreciated. It's been made clear to me that I can't change the physical characteristics of the game itself, so changing the washer type or size, etc., isn't an option.

Another benefit of using an IR sensor is that I wouldn't have to worry about changing light conditions, correct? And do I need to do anything special to make an IR sensor work with a red LED?

Thanks again!
2  Using Arduino / Sensors / Re: What sensor should I use to detect object going through a hole? on: March 08, 2013, 09:03:24 pm
I may have been wrong with the sizes. The hole diameter may be 4". I'll have to confirm this.

RFID is a very interesting option. It would allow me to identify which player's washer went through, which would be great. But I would need to rule out washers sitting on top of the board (that did not go in the hole). And I would worry about the constant throwing and hitting of the board wrecking the RFID chip.
3  Using Arduino / Sensors / Re: What sensor should I use to detect object going through a hole? on: March 08, 2013, 05:07:19 pm
Thanks again!
4  Using Arduino / Sensors / Re: What sensor should I use to detect object going through a hole? on: March 08, 2013, 05:01:02 pm
From doing research, it looks like a laser diode seems to be the way to go, with a simple photocell receiver. If I use mirrors and wrap the \/\/ area with a shield, I shouldn't have to worry about the one laser affecting those for the other two holes. If anyone else has any other input, that's great, but otherwise this seems straightforward enough.

Thanks again for the input!
5  Using Arduino / Sensors / Re: What sensor should I use to detect object going through a hole? on: March 08, 2013, 04:39:35 pm
Thank you very much. It is appreciated. Do you (or anyone) have an opinion on using a laser + a photocell or using infrared?
6  Using Arduino / Sensors / What sensor should I use to detect object going through a hole? on: March 08, 2013, 03:03:42 pm
I'm meandering towards my first ambitious Arduino project and I have no idea what sensor(s) to use for it. The short description is that I need to detect an object going through one of three holes.

The long description is...it's a game with a 4 foot by 1 foot board with three 6 inch diameter holes in it. Points are scored by throwing a flat, metal washer (approximately 3 inches in diameter) through the holes. Different points are allotted based upon which hole the washer goes through. Not sure if this matters, but the game is played outside, in any kind of weather or light. Only one washer at a time is thrown, but multiple washers could go through the same hole in the same round (up to six per round, in theory).

I'm not sure that a motion sensor would work because: A) it's all close proximity (i.e., there's not much space on the underside between the edges of the whole and the sides of the game board), B) the washers will be flying quickly, and C) there are three holes to individually detect.

In theory, I could do a Force-Sensitive Resistor (FSR) if I added baskets to each hole, although that's less preferable.

Any thoughts or input is most appreciated! Also let me know if anything's not clear. Thanks in advance!
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