July 15, 2009
about 2 years ago
Coins with different moments of inertia roll down a ramp at different rates. Moment of inertia contains information about mass and shape.
about 6 years ago
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.
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