Subject:
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Re: Ultrasonic sensor
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Sat, 23 Jan 1999 18:18:59 GMT
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Original-From:
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Will Bain <willbain@cs.umt.edu!NoSpam!>
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Viewed:
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2925 times
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MALTE51 wrote:
> I have bought a Ultrasonic Sensor (with Board) 2 month ago.
> Now, to christmas, I got this COOL Handy Board, but I want to use this
> Board with HB on one of these Analog Ports,
> but HOW???
Firstly, it looks like the sensor board can be powered from the HB using the motor power header (J13). This is good, because the two should share a common ground.
Based on the schematic and the web page description, it looks like this type of ultrasonic sensor will give a digital signal instead of an analog signal. The LED lights up when an object gets close enough.
Apparently, the transistor T1 provides continuity to ground for the LED/R1 combination. Try replacing the LED with a male header plug and plugging it into a digital port on the HB.
BE CAREFUL THOUGH: The ultrasonic sensor runs on 9 to 12 V, so you will need to ensure that resistor R1 is at least a few kOhms to ensure that you don't fry your digital sensor port, which is designed for 5V MAXIMUM.
> Then i have heared, that you can use HB with an external Batt.
> How can i build it? I have not seen Information about it...
I don't know about this. If you use an external battery, make sure it's compatible with the HB's charging circuitry. Probably any 9.6V NiCd battery pack would suffice.
> I try to build a robot like in this "FIRE FIGHTING ROBOT" thing.(I built
> my own Labirint, because America is far away from GERMANY!!)
> But how can my robot know if it is a candle...
> I try it with something like that... (NOT REAL IC NOT BASIC NOT PASCAL
> NOTHING!!)
>
> BRIGHT = ANALOG(0)
>
> IF BRIGHT < ANALOG(0) MAKE SOMETHING
> IF BRIGHT > ANALOG(0) PUT OUT CANDLE!!
If you use a light sensor connected to analog port 0, you first need to calibrate it. Put a candle in front of it and make a note of the sensor reading. Suppose it's about 200. The following sort of Interactive C code would probably work:
int threshold = 190;
while( 1 ) { /* (this begins indefinite loop) */
if( analog( 0 ) > threshold ) break; /* (break out of loop) */
/* search for candle for a moment */
}
/* snuff out the candle */
Good luck!
-- Will
, ,
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~~~~~~~~~ ' ` ~~~~~~~~~~~ ` ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Wendy Parson, Americans detest all lies except
Will Bain, lies spoken in public or printed lies.
& Tatoosh --Ed Howe
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Message is in Reply To:
 | | ULTRASONIC SENSOR
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| I have bought a Ultrasonic Sensor (with Board) 2 month ago. Now, to christmas, I got this COOL Handy Board, but I want to use this Board with HB on one of these Analog Ports, but HOW??? I have measured 2 days long (OK, I DO NOT KNOW MUCH ABOUT (...) (28 years ago, 22-Jan-99, to lugnet.robotics.handyboard)
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