do you have a library for the arduino? How do I calibrate these? Getting an analog reading does not mean anything..

Take a reading while they are dry (that's your 0% reading), then take a sample of your soil and put it in a pot, insert the sensor and then water the pot until it can't hold any more water, then take another reading that's 100% saturated. If you want you can put the sensor near a plant and see what level it reads when the plant looks stressed from to little water and make sure you keep it wetter than that. Note: unless you are measuring pots, the moisture level near the surface is about useless for most plants unless they have very shallow roots.. for plants with deeper roots you probably want to waterproof the top portion of the sensor and bury it about 18" down.

What is the max distance from a pi using 3v3 and using cat5 cable can the sensor be and still work ok?

so not sure if you still need this answered or not, but for others it might help. Im using an Arduino 5v, I used about 10 feet of cat5 cable from arduino to sensor. it changed the value some but you just need to calibrate it for that change. example, Arduino to senor without cat 5 = wet "850" / dry "450" arduino to sensor with 10 feet cat 5 = wet "700" /dry "300"

how does this work? do i have to connected to something else?

Yes. Depends on what you want to do with it. The output is a voltage value. You can connect to an Adruino type device to display it as analog or convert it to a calibrated digital display of percent moisture.

Will this work (as is) with the Micro:bit?

I dont know understand your question. I plugged it into a data port on a esp 8266 read the data using C+ and calibtrated it to meet my needs and transmitted it to a Blynk Control Panel on the internet.

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Songhe Capacitive Soil Moisture Sensor Module Corrosion Resistant W/Gravity for Arduino Moisture Detection Garden Watering DIY 3.3~5.5V 5pcs

Songhe Capacitive Soil Moisture Sensor Module Corrosion Resistant W/Gravity for Arduino Moisture Detection Garden Watering DIY 3.3~5.5V 5pcs

Product ID: 446470936

Details

Brand
Songhe
Item dimensions L x W x H
9.8 x 2.3 x 1
Material
Ceramic Metal
Item weight
90 Grams
Style
Modern

⚡3.3~5.5V wide voltage range

🌱Corrosion-resistant ceramic & metal build

📏Compact 98mm x 23mm size

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Description

🌿 Stay ahead in smart gardening with precision you can trust!

DURABLE LONG LASTING - Corrosion-resistant materials ensure your sensor thrives season after season in any soil condition.
PRECISION SOIL SENSING - Capacitive sensing delivers reliable moisture data, avoiding corrosion pitfalls of resistive sensors.
WIDE VOLTAGE FLEXIBILITY - Operates smoothly between 3.3V and 5.5V, fitting a variety of microcontroller setups without fuss.
PLUG PLAY COMPATIBILITY - Supports Gravity 3-pin interface for seamless Arduino integration—DIY smart gardening made easy.
REAL TIME GARDEN INSIGHTS - Instant analog output lets you monitor soil moisture live, empowering smarter watering decisions.

The Songhe Capacitive Soil Moisture Sensor Module V1.2 offers accurate, corrosion-resistant soil moisture detection via capacitive sensing technology. Designed for Arduino and compatible with Gravity 3-pin interfaces, it operates within a flexible 3.3 to 5.5V range. Its compact size and durable materials make it ideal for intelligent agriculture and garden plant monitoring, delivering real-time analog output for optimized watering control.

Specifications

ASIN	B07SYBSHGX
Best Sellers Rank	45,775 in Garden ( See Top 100 in Garden ) 66 in Soil Meters
Brand	Songhe
Country Of Origin	China
Customer Reviews	4.2 out of 5 stars 212 Reviews
Item Dimensions	9.8 x 2.3 x 1 centimetres
Item Weight	90 Grams
Item dimensions L x W x H	9.8 x 2.3 x 1 centimetres
Item weight	90 Grams
Manufacturer	Songhe
Manufacturer Part Number	F24
Material	Ceramic , Metal
Maximum Supply Voltage	5.5 Volts (DC)
Maximum supply voltage	5.5 Volts (DC)
Measurement Accuracy	±15%
Model Number	F24
Mounting Type	Soil Insertion
Number of Items	5
Output Type	Analog
Specific Uses For Product	Intelligent agriculture, Moisture detection, Garden plants
Style	Modern
Style Name	Modern
UPC	738678030462
Unit Count	5.0 count
Upper Temperature Rating	55 Degrees Celsius

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₪93

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In stock

Sold byAmazon IsraelDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Israel.

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TrustScore 4.5 | 7,300+ reviews

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