<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div>Hi ian</div><div><br></div><div>From the description of the pot you have given, it sounds more like incremental encoder (blue 8 pin dip on the bottom) used for things like volume control (or led duty control), or it could be a buffer but that would be less lightly to be the case.</div><div><br></div><div>Is there a reason to use an arduino in your led project, as you could probably achieve the same result with a 555 timer, or a small 8 pin device like a pic12f629 (just off the top of my head as i have one) they cost about 50p compared to the price of the arduino.</div><div><br></div><div>Of course if i was building a light for my microscope i would have both pure white and rgb leds mounted to it, with a keypad to enter an rgb value because under certain colors of light different things are visible. I use my microscope to examine pcbs, but by changing the color of light i can easier detect certain faults.<br><br>Best Regards<div><br></div><div>Graham Owens</div></div><div><br>On 18 Nov 2014, at 06:32, Ceri Clatworthy <<a href="mailto:ceri.clatworthy@gmail.com">ceri.clatworthy@gmail.com</a>> wrote:<br><br></div><blockquote type="cite"><div><p dir="ltr">PWM is very simple. <br>
Connect O/P to transistor of FET an you are away. ..</p>
<div class="gmail_quote">On 17 Nov 2014 19:41, "Ian Bullfrog" <<a href="mailto:sevendev.tk@gmail.com">sevendev.tk@gmail.com</a>> wrote:<br type="attribution"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">havent heard from the space, webcams down so not sure whats going on tonight, so shall give it a miss.<br>
was called Emyr to see if he was going... his brake lights have failed on car, so you may/may not see him too.<br>
if Dr Tim is there...say HI TIM... to him for me.<br>
<br>
will try again.<br>
<br>
ps.<br>
Got the sensor kit for 23 from banggood so djd gets his points or whatever and some other stuff and then used ALi express for a couple of other things.<br>
it took me about an hour to finalise my order on banggood. order interface/address very clunky. wouldnt give me a county, no drop down and wouldnt let me carry on with order until I selected a county from the drop down it wouldnt show me! aaargh.<br>
and each refresh meant typing it all in again. oh joy.<br>
<br>
but done now.<br>
<br>
Also.<br>
My cousin just asked me to make a light for his microscope with variable power with a super bright LED><br>
the flowery shaped affair.<br>
<br>
easy I said! you can use an arduino to play with it and use pwm to er...umm switch something...erm.<br>
<br>
then I did some googling.<br>
not that straight forward.<br>
<br>
curses.<br>
<br>
any suggestions on where to start? Id like to play with the arduino and program it...because ive got one. but not sure what to drive LED with.<br>
<br>
and then maybe use a pic or something. Im open to ideas.<br>
<br>
oh and with that sensor kit.<br>
I noticed that some of the sensors, have a rectangular blue pot with a tiny 8 leg chip on them.<br>
any idea what that chip would be about and would it make the sensors voltage specific, ie, 3.3 as opposed to 5v , Pi /arduino etc?<br>
<br>
ok cheerio<br>
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