I don t understand.......... why do I get in the red circle 5V when I measure with the voltmeter? it should be D4 there that means no voltage. The 5V should be in the blue circle. I followed this tutorial but my LED from the optical sensor board is not on when I plug it into the ramps.
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The order of the pins in this videos is the same. D4 and GND on the edges and the middle pin 5V.
[www.youtube.com]
The order of the pins in this videos is the same. D4 and GND on the edges and the middle pin 5V.