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how an accelerometer behave in acceleration and deceleration

Nakka Malesh
Prodigy 130 points
Other Parts Discussed in Thread: DRV-ACC16-EVM

Greetings,

                 Please explain me how an accelerometer behave in deceleration (is it gives +ve or _ve values) and how it behaves in acceleration(is it gives +ve or _ve values).

                 consider  object moving in single axis only.

Thank you

  • 0
    TI__Guru* 84915 points

    Hi, Nakka,

    Welcome to E2E and thank you for your interest in our products!

    I strongly recommend to take a look at one of our accelerometers solutions for three-axis acceleration measurements.

    https://www.ti.com/lit/ug/slou402/slou402.pdf

    The EVM converts the acceleration from mechanical movement to mV at a rate of 57 mVpeak per gpeak. This means that every 57 millivolts of peak voltage equals 1 g of peak acceleration and 114 mVpeak equals 2 g’s of peak acceleration. In addition, as mentioned in section 3, there's a DC offset at 1.5V. If the acceleration is positive, you should see a level above 1.5V. When the acceleration decreases, the voltage level is below 1.5V.

    Please let me know if you have additional questions or comments.

    Best regards,
    Luis Fernando Rodríguez S.

  • 0 in reply to Luis Fernando Rodriguez S.
    Prodigy 130 points

    Hi,
       Thank you for your answer,
                                                             Let us consider accelerometer is firmly fixed to a vehicle in a way that Z axis pointing to downwards, X axis pointing to vehicle forward direction and y Axis is perpendicular to the vehicle.Here X and Y axis are independent of Gravity(if the mounted surface is Ideally flat) and dependent on movement of the vehicle(Jerks).

                           I am moving in X direction , I initially started, that means Accelerated in X direction, then what is the behaviour of accelerometer in X direction only (Desired output: It should give +ve values). Please check it once

                         Now after acceleration , i am moving constant speed that means no acceleration ,Now What is the behavior of accelerometer  in X direction only (Desired Output: It should gives me output approx Zero). Please check it once.

                         At last  I want to stop the vehicle by applying the brakes , then vehicle slows down(rate of change of velocity is negative) means deceleration, At this point what is the behavior of the accelerometer in X direction only (Desired output: It should gives me Negative values). Please check it once.

    Please check these characteristics once and give me your detailed explanation.

    Thanks in Advance.

  • 0 in reply to Nakka Malesh
    TI__Guru* 84915 points

    Hi, Nakka,

    Usually, we don't support this kind of questions in this forum since there are no IC accelerometers in this product line. Actually, I think there are no accelerometers in any product line of TI (if I'm not wrong).

    The only solution we have as an accelerometer is the DRV-ACC16-EVM, but it doesn't use a TI IC solution, so we cannot provide deeper details besides the ones described in the User's Guide. In addition, this is an accelerometer designed for low power actuators, so we cannot guarantee a behavior on an automotive solution.

    Do you already have an IC accelerometer in mind? Have you contacted the IC manufacturer for details?

    Thank you.

    Best regards,
    Luis Fernando Rodríguez S.