KCC Quizzes AQQ303 about the radius of a circle
1. Quote of the month: "When I die, I want to die like my grandfather who died peacefully in his sleep. Not screaming like all the passengers in his car" - Will Rogers
2. Quiz AQQ304 about finding the radius of a circle
Good luck, and try to be
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August Monthly Blog Quiz! Read the blog, take the quiz, and you could win a gift card
Important: Read the blog first . The quiz questions are all based on the content of the blog:
Stay in the loop and win! Read the blog Current Output Driving Industrial Loops , then take our quick five-question quiz for a chance to win a gift card
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ADXL327
Production
The ADXL327 is a small, low power, complete 3-axis accelerometer with signal conditioned voltage outputs. The product measures acceleration with a minimum...
Datasheet
ADXL327 on Analog.com
ADXL313
Recommended for New Designs
The ADXL313 is a small, thin, low power, 3-axis accelerometer with high resolution (13-bit) measurement up to ±4g. Digital output data is formatted as...
Datasheet
ADXL313 on Analog.com
Hello -
I need to sample data at a specific rate according to the Nyquist frequency, in my case, about 250Hz. I'm also sampling using an ADXL327 analog device. Once the buffer is filled I trigger a measurement analysis. I want the ADXL313 at highest sensitivity, 0.5g. Today I have a couple of questions.
In order to do this I am using a timer interrupt at exactly 250Hz, where I sample the ADC, fill the 3 axis buffer. Similarly, I want to do the same with the ADXL313 into it's own 3 axis buffer. If I am sampling at 250Hz, what should my ODR be set at when I perform a read: ADXL313_ReadXYZ(&x, &y, &); of the 16 bit values? I assume the ODR is the maximum rate that it can be read with updated values.
And one other question. Using an ADXL313 eval board, it's connected to a L476 Nucleo, and the eval board is sitting pretty much flat. When I run it, I'm getting X values around 0, Y values around 0, and Z values around 511. Is this normal, considering the 0.5g is 10 bits? When the board is upside down Z is then -511. As well, the Z axis sensitivity is almost non-existent in this range! That is - when I tap the desk in close proximity to the board the Z doesn't change, however I see X,Y bouncing around. If I change the range to +/-1g, the static Z value is around 730, and has somewhat better response to a tap on the desk. I have tried setting the DATA_FORMAT register to these values 0x08 and 0x28 (full res bit set) and there's no difference in range 0.5g, it's still at 511
Can someone shed some light on these questions?
Thanks!
Gary