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#1 2010-02-21 11:03:54

JSO
Community Moderator
Registered: 2007-06-23
Posts: 1000+

Trouble with the 4 resistance alligator clips =(

Hi,

I've been trying to make a 4way directional pad (similar to this) with the scratch Sensor Board.

I wanted to do this with only 5 wires going to my costum sensor. All clips were connected on one side but not on the other.

Some ASCII schematics  hmm

Code:

A-1 .___
B-1 .___|
C-1 .___|
D-1 .___|____________________
                             |
A-2 .____________/ ._________|
B-2 .____________/ ._________| 
C-2 .____________/ ._________| 
D-2 .____________/ ._________|

But, guess what? It didn't work  sad  The resistance values of multiple connectors reported a low value when only one switch was closed...

Any tips  wink

Joren

http://oi48.tinypic.com/2v1q0e9.jpg

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#2 2010-02-21 12:21:55

Lucario621
Community Moderator
Registered: 2007-10-03
Posts: 1000+

Re: Trouble with the 4 resistance alligator clips =(

Woah! A scratch balance board! That's cool! I'm reading the block post right now!

*reads*

Looks cool! But I'm not good at building things  tongue  Good luck.

http://i.imgur.com/WBkM2QQ.png

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#3 2010-02-21 12:26:38

JSO
Community Moderator
Registered: 2007-06-23
Posts: 1000+

Re: Trouble with the 4 resistance alligator clips =(

The one in the post uses 8 wires while it should be possible with 5... And I also need the 5 wire thing because I have old joysticks lying around with 5 wires  smile

http://oi48.tinypic.com/2v1q0e9.jpg

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#4 2010-02-21 22:05:02

chalkmarrow
Scratcher
Registered: 2007-05-18
Posts: 100+

Re: Trouble with the 4 resistance alligator clips =(

Joren: I think you might want different value series resistors for A-1, B-1, C-1, and D-1. Like 1K, 2K, 4K, 8K (that way you could use the resistance values to tell which switches are closed). On the other hand, why don't you just use each of the four resistive inputs for each corner?

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#5 2010-02-22 08:26:25

abee
Scratcher
Registered: 2007-05-25
Posts: 100+

Re: Trouble with the 4 resistance alligator clips =(

You may know about the following, If so please skip this.
Alligator clips for resistor look nonpolar. But these have polar. So you need to check which is GND or V+ by a circuit tester before connection.

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#6 2010-02-22 12:21:01

chalkmarrow
Scratcher
Registered: 2007-05-18
Posts: 100+

Re: Trouble with the 4 resistance alligator clips =(

Actually. Strike my last comment; I read the diagram wrong :p 
abee's note re polarity is something to think about, though.

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#7 2010-02-22 12:34:20

JSO
Community Moderator
Registered: 2007-06-23
Posts: 1000+

Re: Trouble with the 4 resistance alligator clips =(

Thanks abee, I'm quite sure that's it  big_smile

chalkmarrow wrote:

Actually. Strike my last comment; I read the diagram wrong :p 
abee's note re polarity is something to think about, though.

ASCII Art diagrams aren't always the easiest to understand - but they are fast to create  smile  Thanks a lot for your support though.

Quick fix... The Scratch community is great  lol

http://oi48.tinypic.com/2v1q0e9.jpg

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#8 2010-02-22 13:44:59

abee
Scratcher
Registered: 2007-05-25
Posts: 100+

Re: Trouble with the 4 resistance alligator clips =(

It's nice to hear that. You're welcome!
Our group had a workshop of Scratch and PicoBoard at the O'Reilly's Make: Tokyo Meeting 04 on last November. And one guy stuck the same problem. I think it's a design matter of PicoBoard.

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