This document describes a smart home alarm system designed using an Arduino microcontroller and Zigbee wireless technology. The system design uses various sensors - an LM35 temperature sensor, MQ-2 gas sensor, and infrared radiation sensor - connected to a sensor node that transmits sensor data to a base station using Zigbee. The base station receives the sensor data and can activate an alarm system if the sensor data indicates abnormal conditions. The system was implemented and tested successfully, providing a low-cost and low-power solution for remote home monitoring and alarm functions.