"Thank you all for your replies. Now I have a better understanding. And will post back my results of the experiment with the can in free fall.....
I hope it will be as expected.....
Vinay"
vinay r's Discussions
Interpreting 3 axis acceleration readings
Started this discussion. Last reply by vinay r Jan 8, 2011. 8 Replies 0 Likes
Problem with Labview
Started this discussion. Last reply by vinay r Jul 27, 2009. 5 Replies 0 Likes
EM406 A Gps problem
Started this discussion. Last reply by Sgt Ric Jul 24, 2009. 2 Replies 0 Likes
vinay r's Page
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DistributorMartint BuildYourOwnDrone.co.uk replied to vinay r's discussion Interpreting 3 axis acceleration readings
"I think there was talk about this some while back, it might be worth a read
Regards
Martin"
Roy Brewer replied to vinay r's discussion Interpreting 3 axis acceleration readings"The way to mathematically model an accelerometer is to take all sources of acceleration (i.e. forces) and subtract gravity. So, in true free fall, you subtract the only force (gravity) and get zero reading (or air drag in actuality). When sitting on…"
ModeratorSebastian Gralla replied to vinay r's discussion Interpreting 3 axis acceleration readings
"you read nearly 0 g on all axis
because of airdrag, you will get a little reading, which is pointing to ground (the axis depends on the can rotation)"
vinay r replied to vinay r's discussion Interpreting 3 axis acceleration readings"Ok, but then if you consider the Z axis accelerometer in falling frame, then shouldnt you also consider the X, Y axis accelerometers in falling frame (or a frame accelerating at speed g)?
Hence when there…"
Martin Seven replied to vinay r's discussion Interpreting 3 axis acceleration readings"It is, but since accelerometers measure using inertia they wouldn't detect anything.
You can look at it from the other side: an object standing on the ground is actually accelerating upwards (at 1 g) in a falling reference frame. Once this…"
vinay r replied to vinay r's discussion Interpreting 3 axis acceleration readings"But isnt the object actualy accelerating in Z axis with magnitude of g?
"
Martin Seven replied to vinay r's discussion Interpreting 3 axis acceleration readings"Objects in freefall are weightless, experiencing zero net acceleration (so all three axes will read 0 g)."
vinay r posted a discussionInterpreting 3 axis acceleration readings
Hi, I have interfaced Freescales 7620 3 axis accelerometer and am getting the readings properly.Now I have difficulty in understanding the readings, If it is mounted on table stationary, then the X,Y read 1.65V (0g) and in Z axis 0.85V (-1g).My question is: What will be the readings in free fall condition? Assuming it wont tilt in falling. My application involves measuring forces on a can during free fall. In real world there will be airdrag, gravity acting on the can. The can will…See More
vinay r replied to vinay r's discussion Problem with Labview"I tried the VI again today, and it worked!! No changes! But i guess i should have tested it thoroughly before i posted the query,, my apologies."
vinay r replied to vinay r's discussion Problem with Labview"K i ll try that and post back the results,"
ModeratorChris Anderson replied to vinay r's discussion Problem with Labview
"You need to download and install the LabView serial drivers."
vinay r replied to vinay r's discussion Problem with Labview"No the USB to serial converter lists the USB port as a serial COM port in the device manager, Besides it also works with hyperterminal. In labview also in the "choose port i/o" list the com port is available."
Greg Fletcher replied to vinay r's discussion Problem with Labview"I am by no means an expert in thi,but do have some lab view experience. One the desktop labview is talking to a serial port
and a usb on the laptop. Maybe you need change the I/O part of the program to talk to a usb?"
vinay r left a comment for Jack Crossfire"Hi Jack, i am trying to develop a fixed plane UAV which i transmit all the data (sensor + GPS) to the ground station(computer) for processing and from the ground station send the pwm values back to the servos onboard the UAV to control the servos.…"
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