Have you played with cacti? I think that would be a better solution for you than MRTG because it can capture damn near any data and display in a graph or just log it for you. It has a pretty steep learning curve, but VERY powerful.
Have never played with that board. Damn! It's really small! What OS / version you using? I've been doing a lot with RPIs and found dietpie to be the meanest / leanest headless distro out there. Worth a look.
There is no OS, you just write a loop of code, flash it, and it runs. Arduino micros are really handy and you can get a 10 pack for like 15 bucks. Also if you are doing anything with pulse width modulation they can't be beat for the price.
Really?!? Wow! I had no idea! What kind of code we talking? Programming or just like shell script level stuff?
Here ya go. (arduino.cc) You can build a board from scratch or buy one. Open source hardware design so there are a lot of chingChong manufacturers and that drives the price down.
I have to admit that I didn't really know about pulse width modulation so did some reading. Another mind blowing thing. So THAT'S how voltage regulators work! Cool shit man! Thanks for sharing this!
I actually do a lot with modulation, but more in the RF realm and some fiber optic. Not sure yet how / if this could apply or fit in.
Pwm is a important thing to learn about, I would recommend reading up and the lm555 timer as you can do PWM analog and at 25 cents per timer it is a deal.
This (pcsilencioso.com) is a good basic design for light dimming or motor control you can do on the cheap.
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