#2 Tilt Sensor [Post Homework Here]

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ThePyroElectro
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#2 Tilt Sensor [Post Homework Here]

Postby ThePyroElectro » Thu May 07, 2015 5:05 pm

A new lesson was posted today:
http://www.pyroelectro.com/edu/sensors/tilt/

Post your homework answers here to compare with everyone else!

electricspatula
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Re: #2 Tilt Sensor [Post Homework Here]

Postby electricspatula » Fri May 08, 2015 2:15 pm

[1] What is the purpose of the two balls inside of the tilt sensor?
The balls inside the tilt sensor close the circuit between the two wires when gravity pushes them down to their resting position.

[2] Why can the tilt sensor we are using also double as a vibration sensor?
When the balls are not being pressed against the two wires, the circuit is open. Vibrating the sensor causes the balls to jump up and down, closing and opening the circuit.

[3] What are 2 example applications of a tilt sensor?
1. A tilt sensor can be used inside a smart phone to determine if the screen should be displayed vertically or horizontally.
2. A tilt sensor can be used in an aircraft to warn the pilot when approaching an angle-of-attack potentially resulting in an aircraft stall.

blipton
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Re: #2 Tilt Sensor [Post Homework Here]

Postby blipton » Sat May 09, 2015 12:10 am

Hi just a general question about tilt sensors.. how do they differ from accelerometer ?

Most projects seem to use a combination of an accelerometer for slow tilt measurements, and then a gyroscope for fast vibrations capture. Any ideas why/how that's done?

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Re: #2 Tilt Sensor [Post Homework Here]

Postby ThePyroElectro » Mon May 11, 2015 4:19 pm

blipton wrote:Hi just a general question about tilt sensors.. how do they differ from accelerometer ?

Most projects seem to use a combination of an accelerometer for slow tilt measurements, and then a gyroscope for fast vibrations capture. Any ideas why/how that's done?


It is popular to combine accelerometer data and gyroscope data together to create an IMU (inertial measurement unit). If you use control theory, for example PID, to clean the combined data, you can get very accurate outputs because the benefits of each sensor is included in the control loop and error minimized.

This white paper goes through the details: https://www.cl.cam.ac.uk/techreports/UCAM-CL-TR-696.pdf

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Re: #2 Tilt Sensor [Post Homework Here]

Postby ThePyroElectro » Mon May 11, 2015 4:20 pm

electricspatula wrote:[1] What is the purpose of the two balls inside of the tilt sensor?
The balls inside the tilt sensor close the circuit between the two wires when gravity pushes them down to their resting position.

[2] Why can the tilt sensor we are using also double as a vibration sensor?
When the balls are not being pressed against the two wires, the circuit is open. Vibrating the sensor causes the balls to jump up and down, closing and opening the circuit.

[3] What are 2 example applications of a tilt sensor?
1. A tilt sensor can be used inside a smart phone to determine if the screen should be displayed vertically or horizontally.
2. A tilt sensor can be used in an aircraft to warn the pilot when approaching an angle-of-attack potentially resulting in an aircraft stall.


Good answers!


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