Well all acc-sensors I have seen so far do return the earth acceleration when not moving. Also they are usually not accurate enough to measure any other acceleration that is a lot smaller then 1G.
If you want to know the acceleration of your car I would try the GPS. You should be able to get enough satellites in your car.
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
Well all acc-sensors I have seen so far do return the earth acceleration when not moving. Also they are usually not accurate enough to measure any other acceleration that is a lot smaller then 1G.
If you want to know the acceleration of your car I would try the GPS. You should be able to get enough satellites in your car.