This fancy optical flow sensor detects motion of surfaces in front of it, from ~80mm to infinity! It's great for DIY drone builds, and it's compatible with Breakout Garden HAT with SPI.
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The PMW3901 is a crafty little sensor that uses a low-resolution camera and some clever algorithms to detect motion of surfaces. A great use for it is detecting and correcting for drift of a drone by looking for x/y motion of the ground below.
You can use this breakout completely solder-free with Breakout Garden HAT with SPI!
We've put together a Python Library to use with your Optical Flow Sensor Breakout. It makes reading the x/y motion values and their magnitude really straightforward.
If you're not using Breakout Garden HAT with SPI, then this is how to connect your Optical Flow Sensor Breakout up to your Raspberry Pi.
Our library is set up to use the front SPI slot by default: BCM 7 for CS, BCM 11 for SCK, BCM 10 for MOSI, BCM 9 for MISO, and BCM 19 for the INT pin.
Here's which pins to connect between your Optical Flow Sensor Breakout and your Pi's GPIO (note that it's BCM pin numbering):
You can of course use other pins but you'll have to change them accordingly when you instantiate the sensor in your code.
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