Green technology : build an electronic soil moisture sensor to conserve water
Posted: Thu Oct 25, 2018 10:46 am
Why will the bulb glow when the soil is dry ? And not when it is wet even though when wet soil offers less resistance.
Hi,
Please take a look at the explanation for "Q: How does the circuit actually work? What is the circuit diagram?" (about half way down the page)
https://www.sciencebuddies.org/science- ... water#help
Hope this helps. Please post again if there's anything else we can help explain, etc...
Good Luck and Have fun with your experiment!
Willey