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### Author Topic: Accelerometer Use  (Read 2652 times)

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#### vidam

• Supreme Robot
• Posts: 423
• Robotronics.org
##### Accelerometer Use
« on: January 26, 2008, 07:30:32 AM »
Dimension Engineering has a 3D Accelerometer which I would like to experiment on using for velocity controlling a robot on different terrain type hills, flat and so forth. Is this a good use for an accelerometer?

http://www.dimensionengineering.com/DE-ACCM3D.htm

#### vidam

• Supreme Robot
• Posts: 423
• Robotronics.org
##### Re: Accelerometer Use
« Reply #1 on: January 26, 2008, 09:19:17 AM »
I just found Admin's tutorial on accelerometers: http://www.societyofrobots.com/sensors_accelerometer.shtml
Is it just me but I see no mention of controlling motor speed with an accelerometer by taking the square root of acceleration and you get the velocity of the robot right?

#### paulstreats

• Supreme Robot
• Posts: 1,381
##### Re: Accelerometer Use
« Reply #2 on: January 26, 2008, 09:28:44 AM »
not exactly.
if you get an initaial reading of say 4m/s, as your robot starts moving along say the x axis, this reading should become less and less until it is 0 m/s, at this point your robot is moving at 4m/s but has stopped accelerating

• Supreme Robot
• Posts: 11,696
##### Re: Accelerometer Use
« Reply #3 on: January 26, 2008, 04:45:44 PM »
Quote
using for velocity controlling a robot on different terrain type hills
how will your accelerometer know the difference between robot acceleration and the gravity vector? it can't . . .

you will need other sensors . . . an IMU actually . . .

#### vidam

• Supreme Robot
• Posts: 423
• Robotronics.org
##### Re: Accelerometer Use
« Reply #4 on: January 26, 2008, 07:01:24 PM »
This is not what I would like to hear. An IMU means more \$\$\$. :-/

#### SmAsH

• Supreme Robot
• Posts: 3,959
• SoR's Locale Electronics Nut.
##### Re: Accelerometer Use
« Reply #5 on: January 26, 2008, 08:37:51 PM »
yea well thats what you get for choosing robotics for a hobby. \$_\$

~smash
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