Determining accleration due to gravity

AWOL:

There are far easier ways to measure the acceleration due to gravity using Arduino

How is that "far easier" than using an accelerometer?

I share the same doubt with AWOL. If you really want an easy method, define what equipment you have first. The easiest one that requires no electronics would be using your own pulse as a time reference as Galileo probably did in his time, or use your watch/clock. Then hang a pendulum (any heavy and compact object will do, such as a key or a stack of coins taped together) with a known string length L. Watch it oscillate say 100 periods and solve the simple T=2PIsqrt(L/g) equation to get g. The period should be fairly close to 2 seconds for 1m string. For those in the US, I know for sure you will have 5,6,7 foot references (relatively accurate) right outside most bank branches. You don't even have to own a tape measure.