- #1
akaliuseheal
- 53
- 8
Hello everybody,
I have made soil moisture sensor and it kinda works. It is a capacative sensor not resistive sensor based upon TLC555 which has a role to create square wave. Square wave is brought to a homemade capacitor. Capacitance changes with change of moisture. Output is measured voltage on impedance (I have included the schematics).
Since it is capacative sensor, it should work when it is not directly exposed to water (in a plastic bag for expample) but it does not. Voltage remains constant when I submerge it in water while it is in a plastic bag but works when submerged without the bag. Homemade capacitor is made of copper plate like in the video. This should work, right? Have I made a mistake soldering it together?
TLC555: http://pdf1.alldatasheet.com/datasheet-pdf/view/28905/TI/TLC555.html
Youtube link: (06:52 for capacative type sensor)
Edit: Voltage is 5V
I have made soil moisture sensor and it kinda works. It is a capacative sensor not resistive sensor based upon TLC555 which has a role to create square wave. Square wave is brought to a homemade capacitor. Capacitance changes with change of moisture. Output is measured voltage on impedance (I have included the schematics).
Since it is capacative sensor, it should work when it is not directly exposed to water (in a plastic bag for expample) but it does not. Voltage remains constant when I submerge it in water while it is in a plastic bag but works when submerged without the bag. Homemade capacitor is made of copper plate like in the video. This should work, right? Have I made a mistake soldering it together?
TLC555: http://pdf1.alldatasheet.com/datasheet-pdf/view/28905/TI/TLC555.html
Youtube link: (06:52 for capacative type sensor)
Edit: Voltage is 5V