[Scaled_sensorWithJack11.26.52.jpg] Headphone plug turned moisture sensor. For a little while now I've been looking at how to do a diy moisture sensor that I could use for my garden project. There are a few designs, but there are drawbacks to each. For instance, one design us…

** A shot of the probe after** A shot of the probe after I added some water to the plant. Previuosly it was showing a reading of around 1.4v The battery I’m using is a 3v lithium watch cell. [Scaled_sensorWithVmeter11_26_52.jpg]

Just a sec Let me go plug my headphones into my plant and see what it has to say. :stuck_out_tongue: I like the headphone jack idea.

Redefining acoustic sensor Redefining acoustic sensor technology since…now! :smiley:

The slightly modified The slightly modified version of the circuit from sead studio…I just added a mosfet switch that allows me to enable the circuit when I need to get the adc reading. [MSC_v1_1.png]

Data Recording. The next part of this is to integrate it with a uProc adc input and save the data.This could be done simply with a picaxe and saving the data to the built in memory space, or even an arduino as there is a lot of code to interface with mem chips. I decided to pave…

Any probe corrosion? Have you tried putting the headphone probe in a glass of water? I’ve tried several moisture sensing circuits only to have the probes turn dark and frizzle after a minute in water. Here’s the only circuit I’ve found that doesn’t corrode: http://www.sentex.ca…

Actually I did put in in Actually I did put in in water as a saturation test but noticed that the voltage was actually less than the max voltage I was getting while in the soil. I need to do some long term testing to see what the corrosion factor is and which types of plugs woul…

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Moisture sensor.(Just another DIY)

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birdmun October 3, 2011, 12:33am 3

Just a sec

Let me go plug my headphones into my plant and see what it has to say.
I like the headphone jack idea.