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  • When coding, I searched online to get the information about the reading levels of soil moisture sensor. 
  • After coding compiled and water added, the reading from soil moisture sensor floated among 1-3, which really confused me, so I:
  1. checked the whole circuit again and asked help from classmates, turning out nothing wrong with it;
  2. replaced the soil moisture sensor with a LED to see whether there is something wrong with the sensor, and the LED didn't light up;
  3. checked the switch...Bingo! It had a poor contact!
So I had to hold the switch all the time during running the program to keep contact.

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