|Mar 02, 2014, 02:11 PM|
|Mar 05, 2014, 02:39 PM|
Joined Jun 2008
|Mar 05, 2014, 04:13 PM|
The Hubsan X4 review thread
I think dark means "no auto leveling". E.g. "No accelerometer", "rate mode", "acro mode". Flying without gyro would require some serious brain acrobatics
The gyro makes a quad fly at all, and the accelerometer makes it auto-level.
Gyro mode is also referred to as "3-axis mode", "rate mode", or "acro mode". If you hold the pitch/roll stick off center, this will result in constant attitude change. If you let go, the quad retains the current attitude.
Flying with accelerometer is referred to as "6-axis", "level mode" or "angle mode". If you hold the pitch/roll stick off center, you command a constant attitude. If you return the stick to center, the quad will return to level.
Rate mode lets you flip etc, angle mode doesn't (unless you cut throttle at the right time, but that's more like accidental panic flips..)
(Btw, I don't get why it's called "accelerometer". It's not measuring acceleration (that's what the gyro does), but absolute attitude. Someone care to educate me?)
I don't think you can fly an X4 in rate mode. I might be wrong. My first X4 is still sitting in the paint shop in Denver
|Yesterday, 08:57 PM|
Jump to: navigation, search
A depiction of an accelerometer designed at Sandia National Laboratories.
An accelerometer is a device that measures proper acceleration. The proper acceleration measured by an accelerometer is not necessarily the coordinate acceleration (rate of change of velocity). Instead, the accelerometer sees the acceleration associated with the phenomenon of weight experienced by any test mass at rest in the frame of reference of the accelerometer device. For example, an accelerometer at rest on the surface of the earth will measure an acceleration g= 9.81 m/s2 straight upwards, due to its weight. By contrast, accelerometers in free fall or at rest in outer space will measure zero. Another term for the type of acceleration that accelerometers can measure is g-force acceleration.
Accelerometers have multiple applications in industry and science. Highly sensitive accelerometers are components of inertial navigation systems for aircraft and missiles. Accelerometers are used to detect and monitor vibration in rotating machinery. Accelerometers are used in tablet computers and digital cameras so that images on screens are always displayed upright. Accelerometers are used in drones for flight stabilisation.
Single- and multi-axis models of accelerometer are available to detect magnitude and direction of the proper acceleration (or g-force), as a vector quantity, and can be used to sense orientation (because direction of weight changes), coordinate acceleration (so long as it produces g-force or a change in g-force), vibration, shock, and falling in a resistive medium (a case where the proper acceleration changes, since it starts at zero, then increases). Micromachined accelerometers are increasingly present in portable electronic devices and video game controllers, to detect the position of the device or provide for game input.
Pairs of accelerometers extended over a region of space can be used to detect differences (gradients) in the proper accelerations of frames of references associated with those points. These devices are called gravity gradiometers, as they measure gradients in the gravitational field. Such pairs of accelerometers in theory may also be able to detect gravitational waves.
|Category||Thread||Thread Starter||Forum||Replies||Last Post|
|Discussion||The Hubsan X4||youxif||Multirotor Talk||55||Jan 31, 2014 09:21 AM|
|Discussion||Hubsan x4 6axis||scousethief||Mini Multirotors||295||Jun 21, 2013 07:22 AM|
|Discussion||Hubsan X4 Mini Quad||dc9guy||Mini Multirotors||32||Feb 04, 2013 10:14 PM|
|Discussion||Hitec X4-80 eighty 4 port chager review search||Timewarp||Batteries and Chargers||4||Jun 22, 2012 04:20 PM|