smart implant FGBS-222 with Soil Moisture Detection

[silvertav 0]

Hello everyone
I need soil moisture sensors to manage the sprinklers in the garden.
I was thinking of using a FGBS-222 smart implant by connecting it to a humidity sensor similar to the one shown below (or others).
Unfortunately I am not able to understand if I can use the AO or DO of the sensor.
Can anyone give me suggestions?

 

 

 

 

 

Feature:
 

Size: 36 x 15 x 7mm

Voltage: 3.3-12VDC

Current: working <20ma, output <30ma

Interface: +-DO AO

DO digital quantity / AO analog quantity

Uses: to detect soil moisture

Principle: The soil moisture probe detects the humidity, and the voltage comparator determines the humidity. When the humidity is greater than the set value, the DO outputs a low level.

 

Instructions for use:

 

1. “+” is connected to the positive pole of the power supply, and “-” is connected to the negative pole of the power supply. Do not reverse the connection, otherwise the chip may be burned out. After the power is connected, the “P” power indicator lights up and the module works normally.

2. The blue potentiometer can be adjusted clockwise/counterclockwise to increase/decrease the probe detection sensitivity. Take the “thermal sensor” as an example. Assume that the default is 25°C trigger and the “DO” output is active low. After clockwise adjustment, the temperature will trigger below 25 °C. Counterclockwise triggers above 25 °C.

3. When the potentiometer is adjusted clockwise until the “S” output indicator is on, it indicates that the adjustment range has exceeded the test threshold, and the counterclockwise adjustment until the adjustment cannot be made exceeds the threshold. When adjusting, the threshold cannot be exceeded, otherwise it will not work properly. When the potentiometer is used only for the "DO" port, it is not associated with the "AO" output.

4. The “AO” output is analog (voltage), which can be directly detected by the AD port of the MCU.

 

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[Tim__ 126]

I'd say you can use either. The analag output will let you take exact measurements, while the digital output acts likes a switch where you can set the sensitivity.  The analog output will allow you more granularity and flexibility. You'll need to experiment a little, a multimeter will help you see how the outputs respond to changing moisture.

 

The smart implant online manual shows you how to connect sensors, there is a diagram for a 0-10v analog sensor connection.

 

Its an interesting project - Please post back once you get it working!

[Kage 37]

it's in dutch but meaby it helps

 

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[Tim__ 126]

7 hours ago, Kage said:

it's in dutch but meaby it helps

 

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Actually there is a button on that page to get the English version too.

 

I did some research a while ago, and the Vegetronix sensor was highly rated for reliable soil moisture measurements.

[Nandy 0]

Hi,

 

Do you have any news on your project?

I would like to to something like this for my garden.

[Iztok88 0]

Hi,

 

would anyone know if maybe this capacitive analog sensor could also be used for the same purpose:

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It has GND, VCC and AOUT connections. The problem I think would that the power voltage is 3.3 - 5.5V DC. Could it be connected to the smart implant like the DHT22 sensor?

 

[GanzConrad 7]

this is batter:

Rain sensor (on/off) with regulated dry time:

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[Sverlinger 1]

Hi,

i just used the Fibaro smart implant to read the sensor directly.

just configure it analog and let the smart implant control the water solenoid by adding something like IRFZ44N mosfet to control the additional power required for the solenoid.

my sensors consist off two screws in acid-resistant stainless steel mounted placed 1,5 cm from each others with a fence wire solded to the screws and connected directly to the smart implant.

This allows you to setup a scene switching on off sprinklers, dripping systems with easy config in the appdepending on how wet you want it. You will have a scale  0-1000 (in Fibaro 0-10.00, with 2 decimal)

each smart can handle 2 independent measurements and solenoids

Edited April 11, 2025 by Sverlinger