Thirsty Plant Project

Thirsty Plant Project
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  • First, we planted the seeds. We made sure that they received enough water and sunlight so they could germinate. Germinating means to begin to grow.
  • Every class, we measured how tall our plants grew. We kept a measurements log.
  • To make sure our plants were getting enough water, we needed a DIY Thirsty Plant Kit. 
  • The sensor was created by using plaster of Paris; by grinding and heating gypsum, it gives up some of its water as steam. Then by adding water to the plaster, we are able to put some heat back in. 
  • Using a plastic marker, 1 LED, 1 Mosfet, 1 resistor, a solar panel, sensor cable, rectangular acrylic casing, 2 acrylic casings, and double sided tape, we created a circuit that would tell us when our plant needed water. We knew the circuit worked when the LED flashed as we touched wires. 
  • 2CaSO4.2H2O (s) ---> CaSO4 . (1/2)H2O (s) + 3H2O (g)
  •  We tested it by holding the solar cell under the light to see if the LED flashed. Our circuit worked! After testing it, we put it in Jamie's plant.  
  • With the Thirsty Plant sensor in the pot, we are now able to determine when our plant needs to be watered. We can also tell how much water is needed each time. 
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