A soil moisture sensor, also called a hygrometer, measures the amount of moisture, or water, in the soil. Therefore, we can tell whether the soil has enough moisture or not. So it is a good diagnostic tool for caring for plants of all types.
The DHT22 goes by several names. The other common name is the RHT22. The data sheet says that it will run from 3.3V to 6V which makes it ideal for Arduino application. Temperature range is -40°C to 80°C with 0% to 100% relative humidity.
Liquid level sensors are used for all types of applications. They are extensively used within automobiles, which rely on a substantial amount of different fluids in order to operate to check for how much gas in the car, windshield washer fluid, oil levles.
El Si7021 es un sensor digital de humedad y temperatura digital de bajo costo y fácil de usar. Este sensor es ideal para la detección del medio ambiente y el registro de datos y es perfecto para la construcción de estaciones meteorológicas o un sistema de control del humidor.
Sonoff TH16 is a wireless temperature and humidity monitoring switch which can remotely monitor and set temperature and humidity range to turn on/off connected appliances through the iOS/Android APP eWeLink. You can buy your Temperature Sensor Here
This is a Waterproof DS18B20 Temperature Sensor/Thermometer. The probe uses original DS18B20 temperature sensor chip. It is waterproof, moisture-proof and anti-rust with the high-quality stainless steel tube encapsulated. No other components, unique single bus interface.