The 3D Printing, Education, and Electronics Specialists

All orders received will ship on the 13th of Jan
We are closed for a break

MindKits Feedback

Overall Store Rating:

these guys know their product - by MMS

when i urgently needed bits for my 3d printer - they had the parts in stock and got them to me overnight.

Oh so good - by Richard

As a digi tech teacher, I use Mindkits for various classroom resources. I also have my Ultimaker serviced there and receive quality 3D printing advice when I need it. The office staff are quick to respond and very helpful.

Technician support - by Elise

Jase went out of his way to come to our home on a weekend to service our 3D printer and give our son tips on how to best use his 3D printer. Love the commitment, responsiveness and excellent knowledge.

OOD!

Optical Flow Sensor for APM Series Flight Control Board

There are no reviews yet. | Write a review

Stock on hand: 0

notify me

SKU:EL-SMS10738S

Price: $54.28

Description
Reviews (0)

This board comes with the ADNS3080 mouse sensor and a lens-mount assembly that can let your vehicles use some pretty cool features such as horizontal altitude hold for quads and helis, odometry and obstacle avoidance.

Features

High resolution: 30 x 30 pixel frames meaning it can see features that lesser mice cannot
High speed: 2000 to 6400 frames per second update rate which contributes to better low light performance than other mouse sensors
SPI interface meaning it can be interfaced to many micro controllers and co-exist with other sensors
Intended to interface with a 5v microcontroller
8mm lens with 11 deg FOV
Standard M12x0.5 lens mount meaning you can replace the lense easily

How it works

The mouse sensor returns the average movement (in the x and y directions) of surface features that it sees. A single pixel move will not cause the sensor to return ?1?. It will return a higher value around 5. This value is referred to as the scaler below. In the example below, the value returned would be about 1.6 ( (-5+5+5) / 3).

Sensor?s x and y values can be converted to real distances based on altitude

In order to convert values from the sensor to real distances moved, we need to take into account the altitude. This is necessary because as you can see from the two pictures below, if we have two quads moving the same distance, but one at a low altitude, the other at a higher altitude, the lower quad will see surface features appear to move further and this will result in a higher optical flow values.

We compensate for vehicle roll and pitch changes

Change in the vehicle?s roll and pitch will also cause changes in the x and y values returned by the sensor. Unlike the lateral movement calculations these are not dependent upon the distance of the visible objects. In the picture below you can see that as the quad has rolled 10 degrees but both flowers have moved from the center of the camera?s view in the 1st pic to the edge of the view in the 2nd pic.

The expected change in sensor values can be calculated directly from the change in roll and pitch given the formula below. We subtract these expected changes from the real values returned by the sensor.

Once we have the x/y movements we can integrate these values over time with the current yaw to arrive at an estimate of position.

Wiki & External links

Usage

Write a review!

Read all reviews