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One is the IOREF that allow the shields to adapt to the voltage provided from the board
and made a number of improvements to our EL Shield
It’s that simple
1x - 6-pin Arduino Stackable Headers
These electrical signals are then amplified and picked up by your microcontroller
SparkFun LED Rainbow Pack - 5mm PTH 3-axis One is the IOREF thatSometimes when you have too many choices, its hard to make a good decision. In fact, there are times when you just want a bag of LEDs, just one of each, thats all you want. Well too bad, you are getting two of each! The LED Rainbow Pack contains two diffused 5mm PTH LEDs of each color of the rainbow, red, orange, yellow, green, blue, and purple. This is a great way to sample each one and decide what you really need or just to add a whole bunch of
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