Soil moisture module is most sensitive to the ambient, generally used to detect the moisture content of the soil.When the module can not reach the threshold value, DO port output high, when the the soil humidity exceeds a set threshold value, the module D0 output low;The small board digital output D0 can be connected directly to the MCU, MCU to detect...
Raspberry Pi 5 MP Wide Angle Camera with Night Vision sensor IR
On board photoresistor, on board adjustable resistor; Operation: connect LED board and PCB board of camera w/ screw, adjust resistor of LED board (IR light auto work when it is dark and auto off if it is bright)
The RTC module is specifically designed for Raspberry Pi. It communicated with Raspberry Pi through I2C bus. There is a Maxim DS1307 and CR1220 button cell on the board to keep the real time for a long time after the Raspberry Pi has its power down. Set a serial port, TTL convenient way online debugging.
The DHT-22 is a low cost humidity and temperature sensor with a single wire digital interface. The sensor is calibrated and doesn't require extra components so you can get right to measuring relative humidity and temperature.
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