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Hi,Inkjet printer will not work (different kind of toner/paint, different way of printing etc.). Only laser.Etching solutions is usually available at local electric shops (where normal components are available: resistors, leds or even plain PCB boards). Note that it is not available for on-line orders in most countries due to postage restrictions.
I agree... Most "beginner" Arduino projects are simply "forget" the necessity of current limiting resistors. (Meanwhile many sources states that the lack of these are not a real risk at all.) BTW, I suggest to use 220 R (or similar) resistors on each cathode line (pins D2~D8). For the next step, a shift register may help a lot to use less pins and better coding (MAX 7221/7219 for example).
Battery operated variable bench power supply 0-20V 0-2A
ARDUINO SOLAR CHARGE CONTROLLER ( Version 2.0)
Arduino Robotic Arm
EASY Extendable Pole Mount for ANY Camera
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125 KHz RFID OPERATED DEADBOLT
Understanding Italian Gestures
Electric Coffee Maker
cheap, nice and weird A4 graph plotter ($25 + some scrap)
Make an Oscilloscope Using the SainSmart Mega2560 with the TFT LCD shield and the 3.5 "color touch screen
Paracord Cord Reinforcement
ARDUINO SOLAR CHARGE CONTROLLER (Version-1)
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How To: Clean Your Cast Iron Pan (including how NOT to)
PC to Portable workstation/toolbox
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