True IoT is not merely about "being connected" but about "perception + decision-making." In smart cities, smart home appliances, and industrial IoT, non-contact liquid level sensors (capacitive principle), diffuse infrared sensors, and human presence sensors form the most fundamental perception triangle.
Shenzhen Xingkechuang Technology Co., Ltd. has focused on this field for over ten years. Its XKC-Y29A capacitive non-contact liquid level sensor can detect water levels by adhering to the outer wall of containers; the KE200 sunlight-resistant diffuse infrared sensor is suitable for object proximity and auxiliary liquid level judgment; the XKC-LD002 60GHz mmWave static human presence sensor can identify sitting/sleeping states. These three can be connected via UART/IO to ESP32, LoRa, or WiFi modules to form a complete IoT terminal node.
In Xingkechuang's IoT reference designs, liquid level data serves for "water volume digitization," infrared for "object-in-place / anti-overflow assistance," and human presence for "space occupancy determination," all uniformly reported via MQTT/Modbus,彻底 replacing cloud-algorithm-only pseudo-intelligence.
