From: Mike Poulton
Subject: Re: 0-100s timer using 555 IC and panel LED
Date: 16 Sep 2002 19:46:45 GMT
Organization: MTP Technologies
On 16 Sep 2002, dansimon@REMOVExmission.com (Daniel Simon) said:
> On 10 Sep 2002 11:27:42 -0700, email@example.com (Jeff
> Lawlis) wrote:
>> I am a Physics teacher with a basic understanding of electronic
>>circuits. I would like to build an elevated ramp with adjustable
>>slope, whereby an object would be allowed to roll down the slope. At
>>5 places along the ramp, I would like to incorporate phototransistor -
>>LED (focused) pairs, such that when the light beam is interrupted, it
>>activates a relay. The main goal would be to time the object at
>>different locations, in order to caluculate the velocity at each
>>position. I would like to use four digit LED diplays, displaying time
>>to the nearest hundredth of a second.
Sounds like an application for a microcontroller to me. I would suggest
a PIC, but I can't get mine to work right now, so... A BASIC Stamp
would be easier if you've never used a microcontroller before. The
stamps are very easy to program and offer enough I/O lines to do what
you want. Displaying the timing data on an LCD screen would be easier
than LEDs, since LCD units are available with one-wire serial
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