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lh84 / moisture_sensor_esp12

capacitive moisture sensor with ESP8266 (Wifi), powered with 18650 battery (already tested)
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Progress :-) #6

Open theopensourcerer opened 7 years ago

theopensourcerer commented 7 years ago

See attached images. I've designed a new board based on your ideas, and others, using Kicad. I got the PCBs back from Seedstudio* the other day. I tested the sensor plate and schmitt trigger before soldering the rest of the components and I'll see if I can get some code running on it over the weekend.

The oscillator frequency varies a lot when I hold the probe in my hand... If I get the variable resistor set right, the frequency changes from ~65kHz down to about 15kHz.

Once I've got some code working I will be able to to some proper tests and measurements.

The sensor plate is symmetrical on both sides of the PCB - I believe this increases the capacitance of the plate considerably.

20170323_214341 20170323_214309

PS: Seedstudio were very cheap. I had 10 boards made, and shipped, for $25.

ctripodi commented 7 years ago

Hello, I really appreciate you project. Do you have news about the current status? What about the source code? Is there some recommendation?

lh84 commented 7 years ago

Hi Alan, it looks really good! The price sound pretty good. Have you done some tests already? How stable is the frequency over weeks?

lh84 commented 7 years ago

Hi ctripodi, As software you can use the code from zentris https://github.com/Zentris/erdfeuchtemessung it worked pretty good for my case. Unfortunately my last sensor broke after 6 weeks running and I had no time to overhaul the sensor. So much to do at work :( I hope I will get back soon to this project