I don't use an arduino myself, though I do own one and have used it. I just had a look at the ARDX kit. Looks pretty neat.It has a lot of stuff to do some fun experiments that would get a beginner started.
Just a note on your RGB temperature indicator idea. The temperature sensor in that ARDX kit is TMP36. You may end up with a scale issue.
Say you want to fade from blue to red over "room" temperature (20c-27c). 8-bit PWM there will give you 256 values each way for a total of 512 values over the range of full blue to full red representing 20c and 27c respectively. With that sensor the 7c room temp swing on a 10bit ADC is only 14 counts.
Basically, you can have 14 "fade steps" between blue and red and whatever colours in between. This will create a very noticeable color change in a very tiny voltage reading change. Noise on the ADC and how you read the ADC will be paramount.
Basically the light will probably look like it is freaking out all the time and not be useful for a visual indication of temperature. None of that should discourage you from experimenting though! Maybe if the fade idea does not give you the desired results you could display just 3 colours instead of the fade.
Say green for 23c +/-2c and hysteresis. Then red and blue for above/below. Also, there is an O'Reilly book called Making Things Talk.
ISBN 9780596510510 It has a lot of arduino experiments in it and you may find that building your own arduino starter kit is the way to go.
Depends on how much you want to spend, and if you want to spend it with a small company or a large company. Www.adafruit. Com has several levels of starter kits.
I reccomend the ARDX kit.Www.sparkfun. Com also has a version of the ARDX, called the "Sparkfun Inventors Kit". Both kits are the same on all but one project at the end.
Both will have enough parts for the idea that you have. I bought the ARDX from adafruit for my girlfriend and both of us were very happy for the money we spent on it.
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