[Swansea Hackspace] ok wont be in.

[Graham Owens]

Hi ian

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.

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.

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.

Best Regards

Graham Owens

> On 18 Nov 2014, at 06:32, Ceri Clatworthy <ceri.clatworthy at gmail.com> wrote:
> 
> PWM is very simple. 
> Connect O/P to transistor of FET an you are away. ..
> 
>> On 17 Nov 2014 19:41, "Ian Bullfrog" <sevendev.tk at gmail.com> wrote:
>> havent heard from the space, webcams down so not sure whats going on tonight, so shall give it a miss.
>> was called Emyr to see if he was going... his brake lights have failed on car, so you may/may not see him too.
>> if Dr Tim is there...say HI TIM... to him for me.
>> 
>> will try again.
>> 
>> ps.
>> 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.
>> 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.
>> and each refresh meant typing it all in again. oh joy.
>> 
>> but done now.
>> 
>> Also.
>> My cousin just asked me to make a light for his microscope with variable power with a super bright LED>
>> the flowery shaped affair.
>> 
>> easy I said! you can use an arduino to play with it and use pwm to er...umm switch something...erm.
>> 
>> then I did some googling.
>> not that straight forward.
>> 
>> curses.
>> 
>> 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.
>> 
>> and then maybe use a pic or something. Im open to ideas.
>> 
>> oh and with that sensor kit.
>> I noticed that some of the sensors, have a rectangular blue pot with a tiny 8 leg chip on them.
>> 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?
>> 
>> ok cheerio
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