This page (revision-8) was last changed on 2021-04-06 09:41 by Murray Altheim

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Page References

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Optical Flow Sensor
OpticalFlowSensor

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This page describes two __Optical Flow Sensors__ produced by Pimoroni.
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Normally the PMW3901 Optical Flow Sensor is used by flying drones to
measure the distance moved over the ground. In the case of a
Mecanum-wheeled robot, the PMW3901's camera would be mounted just over
its 80mm minimum focal distance and its x,y output used for the robot's
odometry, i.e., to measure how far the robot has traveled.
Normally the __PMW3901 Optical Flow Sensor__ is used by flying drones to measure the distance moved over the ground. In the case of a Mecanum-wheeled robot, the PMW3901's camera would be mounted just over its 80mm minimum focal distance and its x,y output used for the robot's odometry, i.e., to measure how far the robot has traveled.
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While the sensor itself provides numeric values, this video shows a test
rig using a 5x5 RGB LED matrix that indicates which direction the
sensor has moved by color: red for port movement, green for starboard,
cyan for forward and yellow for aft.
While the sensor itself provides numeric values, this video shows a test rig using a 5x5 RGB LED matrix that indicates which direction the sensor has moved by color: red for port movement, green for starboard, cyan for forward and yellow for aft.
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[{Image src='attach/OpticalFlowSensor/PAA5100JE-fab.jpg' link='attach/OpticalFlowSensor/PAA5100JE-fab.jpg' caption='Prototype fabrication of the PAA5100JE (click to enlarge)' width='400' align='right' class='imgFloatRight'}]
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The PAA5100JE-Q is PixArt Imaging's latest optical navigation chip designed to enable navigation with working range of 15 mm to 35 mm over various surfaces. It is housed in a 28-pin land-grid-array (LGA) package that provides X-Y motion information. Aided by external illumination, it is most suitable for motion and surface detection in robot application.
The PAA5100JE-Q is PixArt Imaging's latest optical navigation chip designed to enable navigation with working range of 15 mm to 35 mm over various surfaces. It is housed in a 28-pin land-grid-array (LGA) package that provides X-Y motion information. Aided by external illumination [[two built-in LEDs on the Pimoroni board --ma], it is most suitable for motion and surface detection in robot application.
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* [PAA5100JE-Q: Optical Tracking Chip|attach/OpticalFlowSensor/PAA5100JE-Q-GDS-R1.00_25072018.pdf
! Key Features
* Working range of 15 to 35 mm
* No lens focusing required during lens mounting process
* Power consumption of 6 mA typical @ run mode (chip only)
* 16-bits motion data registers
* Motion detect pin output Internal oscillator – no clock input needed
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! Applications
* Devices that require near field motion detection, e.g Robot Cleaners
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!! Links
* [PAA5100JE-Q Optical Tracking Chip Product Datasheet|https://service.robots.org.nz/wiki/attach/OpticalFlowSensor/PAA5100JE-Q-GDS-R1.00_25072018.pdf]
This page (revision-8) was last changed on 2021-04-06 09:41 by Murray AltheimTop