The MQ-2 Gas sensor can detect or measure gasses
It is use of optics , through the liquid
Ultrasonic Distance Sensor
The moisture sensor consists of two probes measure the volumetric
It detects motion by measuring changes in the infrared levels
It is used for rain detection. It is also for measuring rainfall
Having a pair of infrared transmitter and the receiver tube
ESP8266 Serial Wi-Fi Wireless Transceiver
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It is based on the ESP32 microcontroller
Easy to use Lua scripting, You can simply command