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ESP32 is a series of low-cost, low-power system on chip microcontrollers with integrated Wi-Fi and dual-mode Bluetooth. ESP32 is created and developed by Espressif Systems It is a successor to the ESP8266 microcontroller.
A sensor is a device that detects and responds to some type of input from the physical environment. The input can be light, heat, motion, moisture, pressure or any number of other environmental phenomena.
IEEE 802.15.4 is a wireless communication standard that was specifically designed for low-rate, short-range wireless communication among devices.