Subject:
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Re: Stupid Sonars
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Tue, 23 Feb 1999 04:02:44 GMT
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Original-From:
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Laszlo Roska <lroska@cyberus(IHateSpam).ca>
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Viewed:
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1224 times
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Try connecting a 4.7K pull up resistor to VCC on the ECHO pin before the
diode.
the echo pin is open collector and pull up is provided by the handy
board digital input when used as described in the handy board
instruction. When you add the diode
this no longer works because the echo pin is no longer pulled up to vcc.
0 Vcc 0 Vcc
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< <
> 4.7K > 4.7K
< <
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handy Board --------|>|-------.----------|---- To Polaroid 6500 #1
| D1 1N914 |
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|---|>|------------------.---- To polaroid 6500 #2
D2 1N914
P.S. let me know if it works
Ian Hojnicki wrote:
>
> I have a extremely complicated two polaroid sensor set up going on... I
> had a diode connected to each of the ECHO lines so that I can combine the
> two lines together... However, no signal passes through this setup...
> However, I have validified the fact that they work independently... My
> question is Fred or anybody else on this god forsaken planet, can I use
> BOTH TIC2 and TIC3 for the sensors??? I would share all of the other
> lines except for the ECHO lines... If I can use both of them, what would
> be the corresponding addresses that I would need to poke and clear to
> make this work??? I have no clue as to where to look up this
> information, so I decided to just ask this question... I would
> appreciate a speedy response...
>
> Ian
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Message is in Reply To:
 | | Stupid Sonars
|
| I have a extremely complicated two polaroid sensor set up going on... I had a diode connected to each of the ECHO lines so that I can combine the two lines together... However, no signal passes through this setup... However, I have validified the (...) (26 years ago, 22-Feb-99, to lugnet.robotics.handyboard)
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