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 for long life

📏Precise analog output 0~3.0V

€ 23.93

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Description

🌿 Upgrade your garden IQ with precision moisture sensing!

WIDE OPERATING VOLTAGE - Supports 3.3 to 5.5V, compatible with a broad range of microcontrollers and DIY projects.
REAL TIME SOIL INSIGHTS - Get instant, reliable moisture data to optimize watering schedules and boost plant health effortlessly.
ACCURATE CAPACITIVE SENSING - Measures soil moisture with ±15% accuracy, avoiding false readings common in resistive sensors.
PLUG PLAY GRAVITY INTERFACE - Seamlessly integrates with Arduino and Gravity I/O shields for instant smart gardening.
DURABLE CORROSION RESISTANT BUILD - Engineered with premium ceramic and metal to withstand harsh soil conditions season after season.

The Songhe Capacitive Soil Moisture Sensor Module V1.2 offers a corrosion-resistant, analog capacitive sensing solution for accurate soil moisture detection. Compatible with Arduino and Gravity 3-pin interfaces, it operates within a 3.3 to 5.5V range and delivers real-time moisture data, making it ideal for intelligent agriculture and DIY garden automation projects.

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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