Rainfall refers to the depth of the water layer that falls from the sky to the ground and accumulates on the water without evaporation, infiltration, and loss. It is usually measured in millimeters, which can visually indicate the amount of rainfall. To measure rainfall, you need to choose a suitable container, usually a funnel, and then measure the amount of water captured over a period of time. Measuring rainfall usually requires a continuous period of time for a selected period of time. This experiment will use a method of continuously monitoring the amount of rainwater without having to go out.
Equipment required: DrDAQ data logger connected to PC, 50 linear potentiometer, a properly sized beaker or cylinder, a holder, sleeve and clip, material for making lever arms and floats.
Introduction: There are many devices in the industry where people must be able to detect the height or depth of a liquid at any time. The most common tanks and tanks for cars are used even in flush toilets. One of the most common methods of monitoring the level of liquid in a container is to use a float that rises and falls as the liquid level rises. If the float is connected to the spindle of the potentiometer, the movement of the float can be converted into an electrical signal. The following are two methods for detecting the movement of the float by the spindle of the rotary potentiometer.
After selecting a method for the float to rotate the rotary potentiometer spindle, simply connect the potentiometer to the resistor and ground terminal on the DrDAQ data logger. Turn on the PC and run the Picolog software setup to monitor the resistance for more than 48 hours and sample every 15 minutes.
However, please note that you must perform some calibration so that the resistance change monitored by DrDAQ can be converted into a millimeter floating motion. For example, an increase in 1k resistance is equal to a 10mm rise in the float. Then by selecting the parameter settings in the Picolog software, we can multiply our resistance by 10 to give us the depth of the rain. This "rainfall" can now be displayed in the form of a graph marked with an axis.
Further research: Wires immersed in water can cause changes in the conductivity of the submerged water. Please design your own alternative. But no matter what you do, make sure the signal is calibrated.
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