The most popular option for IoT temperature sensing is a digital temperature sensor. Digital temperature sensors are widely used in IoT devices due to their low cost, compact size, and low power consumption. They typically consist of a small integrated circuit (IC) that contains a temperature sensor, an analog-to-digital converter (ADC), and a communication interface, such as I2C or SPI. Digital temperature sensors can provide temperature readings with high accuracy and resolution, and they can be easily integrated into IoT devices and networks. Some examples of digital temperature sensors commonly used in IoT applications include the DS18B20, DHT11, and LM35.