DHT22 Temperature and Humidity Module IDC It has I2C bus interface

It has I2C bus interface to communicate with the micro controllers

It does not "automatically prevent the operation of the power supply"

56MHz RFID IC Key Tag

and effectively protect MCU

This Solar charger provide you with the ability to get the most possible power out of your solar panel or other photovoltaic device and into a rechargable LiPo battery

DHT22 Temperature and Humidity Module IDC It has I2C bus interfaceThe DHT22 is a basic, low cost digital temperature and humidity sensor. It uses a capacitive humidity sensor and a thermistor to measure the surrounding air, and spits out a digital signal on the data pin (no analog input pins needed). It's fairly simple to use, but requires careful timing to grab data. The only real downside of this sensor is you can only get new data from it once every 2 seconds, so sensor readings can be up to 2 seconds old. Simply