I bought the 200 opto transistors on trade me and will make 100 of them available to club members.<br><br>Opto transistors are really fast compared to light dependent resistors... see my blog showing some measurements on this: <a href="http://embeddedjanitor.blogspot.com/">http://embeddedjanitor.blogspot.com/</a><br>
<br>My 4-channel light sensor is progressing slowly....<br><br>-- Charles<br><br><br><br><br><div class="gmail_quote">On Fri, Jun 19, 2009 at 7:42 AM, Richard Jones <span dir="ltr"><<a href="mailto:rjtp@ihug.co.nz">rjtp@ihug.co.nz</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">Doh,<br>
<br>
I missed the opto components in 3.5" floppies. Thanks Andrew.<br>
<br>
One advantage of the Trademe components is the availability of data sheets<br>
and consistency of performance. For my wall sensors I need six reasonably<br>
matched emitter and detector pairs as I'm doing maths with the results. The<br>
data sheets tell me I can pulse the LEDs with 10A for 1us or 3A for 10us<br>
from memory. Not sure I would do that to an unknown component and expect it<br>
to survive!<br>
<br>
I also have a single 5.25" floppy drive waiting to have the stepper motor<br>
taken out. A stepper micromouse design is planned as a followup to the<br>
optical and sonar brush motor mice that I have at the moment.I think the<br>
parallax propeller will make an excellent stepper mouse controller.<br>
Dedicating a cog to each sonar and stepper motor channel still leaves 3 for<br>
other activities.<br>
<br>
Morris is all fired up on printer parts. Any other devices we should be<br>
looking out for? I know photocopiers look interesting but I've not found<br>
one to take apart yet.<br>
<br>
How is life in Korea?<br>
<font color="#888888"><br>
Richard<br>
</font><div><div></div><div class="h5"><br>
<br>
On Thu, 18 Jun 2009 18:28:05 +0900 (KST), "Andrew Errington"<br>
<<a href="mailto:a.errington@lancaster.ac.uk">a.errington@lancaster.ac.uk</a>> wrote:<br>
> On Thu, June 18, 2009 17:55, Richard Jones wrote:<br>
>> I'm using optical sensors on my micromouse for wall detectors and<br>
>> rotation sensors, hence my interest in these. The cheapest infra red<br>
> LEDs<br>
>> and photo diodes come from scrap mice. However if your supply of dead<br>
> mice<br>
>> is running out there are some components on Trademe that may be of<br>
>> interest:<br>
><br>
> Don't forget, scrap mice show up at the SuperShed regularly, and you can<br>
> get tiny slotted opto switches from 3.5" floppy drives (track 0 sensor).<br>
><br>
> Actually, mechanical mice and 3.5" drives are surely fast disappearing.<br>
> Better stock up now.<br>
><br>
> Andrew<br>
><br>
><br>
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