Just run it through a d.c. blocking capacitor. Does this mean that the signal coming out of the accel. is not the same as the .wav file?
The voltage from the Accelerometer is 0.330 to 2.97 VDC going into the arduino ADC
Basically I find the ADC value of 1G (gravity) acting on the Z-axis (Datasheet VCC/2 or 1.65V), and subtract that as a offset to get 0G's within software
Then when the bump is hit, it is set at 0G's in software, and has negative and positive Gforce because it is zeroed in software
The sensitivity of the accelerometer is 440mv per G a -3G/+3G Accelerometer
The actual voltage coming out of the accelerometer isn't conditioned to be negative, so instead of subtracting the 1G gravity offset in software, I should "zero" the output of the accelerometer by a differential amplifier, since 1G = 1.65V If I apply 1.65 of DC offset it will be 0 volts, like it was within the software. So the signal actually gets rectified
Question, The rectifier with the opamp, I found is called a super diode, what makes this better than a single regular diode? Is it because the diode drops the signal .7 volts?
I have a KXPS5-3157 Accelerometer, that outputs 0.330 to 2.97 VDCVDC
The zero-G offset is 1.65VDC (VCC/2)
1G of gravity = 1.65VDC + 0.440 = 2.09 volts = ZERO to cancel out gravity
I want to "zero" the output of the accelerometer strictly in hardware. I was thinking of using a Differential Amplifier, and inputting -2.09 and the output of the accelerometer to zero it. Not sure if this will work, my application is as follows:
The sensitivity of the accelerometer is 440mV/G
I want to zero out of the accelerometer on the Z axis to cancel out gravity, so subtract 2.09 volts.
Then I want the output of the accelerometer to swing positive G's Positive voltage, and negative G's negative voltage.
I want the accelerometer to output negative and positive voltage corresponding to the -G and +G's, canceling out the affect of gravity also
The supply voltage is 12volts, I'm assuming a would need a rail to rail opamp?
I was doing this all in software with subtracting ADC values of the voltage within the software, but to use the filters and rectifiers I have to have positive and negative voltage