Certain aspects direct to systems and methods for preventing water pipe freeze. A water supply system includes a water pipe and an Internet of Things (IoT) tap device switchable between an open state and a closed state. An IoT temperature sensor is disposed on the water pipe to detect an environmental temperature of the water pipe and generate a corresponding temperature signal. The IoT tap device is communicatively connected to the at least one IoT temperature sensor. In operation, the IoT tap device requests and receives the temperature signal from the temperature sensor, and determines the environmental temperature based on the temperature signal. When the environmental temperature is at or below a threshold temperature, such as a freezing point of water, the IoT tap device controls its tap to switch to the open state such that water flows or drips out from the tap.