
I was planning to use 4 sensors with Arduino with SPI interface. I tried the blue sensors and they failed intermittently and had poor range. Then I tried the red one from Sunfounder and it worked and had more range. I ordered 8 more of them but mixed some blues with reds. The blue ones were in a box that looked the same but didn't have the same ink and cardstock colors - they looked like fakes to me. They also had slightly different components and no logo was printed on the board. So I sent the blue ones back.

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