Silverman
Member Since: July 15, 2009
Country: United States
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Coins with different moments of inertia roll down a ramp at different rates. Moment of inertia contains information about mass and shape.
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The boards that are shipping now don't match the photo or the schematic. They're red instead of green, which is awesome, but the resistors marked "not populated" are now populated. I had a frustrating time figuring out that the pull-down resistor on SCK was sinking enough of my clock that the sensor itself was ignoring it.
So test the board in your circuit before you install it in a way that blocks those resistors from being removed.
Also, I recommend Mouser 651-1725672 as a really tidy connector that solders directly onto this board. It dwarfs the sensor, but if you're running a cable to the sensor mounted inside an enclosure, it's nice to have screw terminals.
