This document presents three methods for hand gesture recognition using MEMS accelerometer sensors: 1) A sign sequence and Hopfield network model that extracts features from acceleration data, encodes gesture sequences, and uses a Hopfield network for recognition. 2) A velocity increment model that normalizes acceleration data based on sign and calculates velocity increments for comparison. 3) A sign sequence and template matching model similar to the first but without a Hopfield network. Experimental results found the third model had the highest accuracy. The research aims to enable natural human-computer interaction through gesture recognition using low-cost MEMS sensors.