Moisture sensors bad value

[dxtx]

Hello, i have installed
Grove base kit with raspbery on pi4b form this tutorial:

Grove Base Kit for Raspberry Pi - Seeed Wiki

i have this sensor : https://wiki.seeedstudio.com/Grove-Moisture_Sensor/
I have a problem with numerical values
In tutorial are these values: 0-300 300-600 600- or higher.
If I put the moisture to moist soil, it comes > 1800
how can i fix it please?
Thanks

[Hansen]

Hi @dxtx:
can you give me the connection of hardware? and only sign area can be used as below pic.

[dxtx]

Hi,
i h ave all componnets from Grove base kit with raspbery pi 4b:

l2c - first port - LCD display
D5 - DHT11
D16 - grove relay
A0 - grove Moisture sensor

Python defined:

def main():
lcd = JHD1802()
teplota = DHT(‘11’, 5)
spinac = GroveRelay(16)
puda = GroveMoistureSensor(0)

I checked the soil sensor connection and pulled it up - problem is same - the sensor shows very high values.

[Hansen]

Hi @dxtx:
Can you give me the data that disconnect the soil sensor? like this.

and we can get as below data.

[dxtx]

I don’t understand your request.
Here is foto rapsberry how i have connected it.

Here is program output from sensor:

[Hansen]

Hi @dxtx :
It is a good choice to only the humidity sensor is left on the basehat and the others are unplugged then run test.py.

[dxtx]

this was, of course, the first option I tried. Unfortunately, the result is the same. The sensor shows very high values ​​in any A port. How can this be fixed, please?

[Hansen]

HI @dxtx:
did you use this code

[dxtx]

same problem

[Hansen]

Hi @dxtx:
1.Can you disconnect all elements and only connect to baseHat.like this.

2. and run the adc.py code.
I would say, I want to know the Basehat is whether damage.

[dxtx]

Here is output with disconnect all elements:

[Hansen]

Hi @dxtx:
I would say, the base-hat is normal to work. because I got the same data from my basehat.

So the wiki needs to update. thanks for your feedback.

[dxtx]

OK, thank you,
can you please write what are the new values ​​for the definition soil moisture -
In wiki is now - 0-300 dry; 301, 600 moist; > 600 wet

dry - 0 - ?
moist - ? - ?
wet - > ?

Thank you

[less]

Hi, i have exactly the same problem with the Capacitive Moisture Sensor (Corrosion-Resistant) attached to the Grove Base Hat for Raspberry Pi, did you ever fixed the problem?

[thats.insanee]

Issue still exists

Code source: Wiki

Measurements in wet soil (whole sensor part is under soil)

Can someone help me with this?

@Hansen

[macgyverops]

The problem is the NE555 timing chip requires a minimum voltage greater than 3.3. (4.8) i believe. Thus the values will always be off. These capacitive sensors are garbage. 85% of them on the market are like this.

[Seeed_Seraphina]

I have tested today and the Capacitive Moisture Sensor (Corrosion-Resistant) is working as expected

[Auzon_Apophis]

Hello all - I am using the basic moisture sensor for my student project at Uni and I’m getting the same really high values. I have no idea how to fix this.
@Seeed_Seraphina you managed to get it working. How do I get it working?

I have a RPi 3b+ and the grove hat for RasberryPi

[Seeed_Seraphina]

I use grove_moisture_sensor.py from grove.pi library. This code works fine. Which demo are you using?