> **Source:** Core Electronics is an Australian maker-electronics retailer and manufacturer based in Newcastle, NSW, run by a team of makers and educators. We design and manufacture our own product lines (PiicoDev, CE originals) and are official retailers for iconic maker and industrial brands including Raspberry Pi, Arduino, Adafruit, SparkFun and DFRobot. Orders ship Australia-wide from our Newcastle warehouse. Prices are in AUD and include GST. Pricing, stock and dispatch on this page are generated from the store's live catalog. Full machine-readable index: https://core-electronics.com.au/llms.txt

# Capacitive Soil Moisture Sensor (v2.0)

**Type:** Product page · **SKU:** CE09640 · **Brand:** [Core Electronics](https://core-electronics.com.au/brands/core-electronics-australia)
**Page:** https://core-electronics.com.au/capacitive-soil-moisture-sensor-v20.html ([markdown](https://core-electronics.com.au/capacitive-soil-moisture-sensor-v20.html.md))

Check-in with your plant friends, this sensor is great for detecting soil moisture levels!

> ⚠ If you are after a full plant automation kit - [check out Plant\_io](https://core-electronics.com.au/plant-io-plant-cultivation-kit.html)

## Pricing

- **Price:** $2.95 (inc GST) — $2.68 AUD, exc GST
- **Quantity discounts:** 5+ $2.63 (exc GST) · 15+ $2.55 (exc GST)

## Availability & dispatch

- In stock, ships same business day if ordered before 2PM (Australia/Sydney).
- We can dispatch 256 today; more stock is typically available with a 8–12 day lead time.

## How to buy

- **Build a cart:** compose `https://core-electronics.com.au/cart/link?items=CE09640:1` (comma-separated SKU:qty pairs) and share the link. Opening it shows a confirmation page with live pricing and stock before anything is added to the cart.
- **Verify the cart first:** fetch `https://core-electronics.com.au/cart/link/CE09640:1.md` for live line prices (inc & exc GST, quantity discounts applied), stock and dispatch estimates, and totals. Append `/to/{AU-postcode}` (or `/to/{country-code}:{postcode}`) before `.md` for delivery options and prices to that destination. Unknown, retired, or out-of-stock SKUs are flagged. (Query form `cart/link.md?items=...` also works but some robots parsers refuse query strings here.)
- **Checkout** is completed on-site and includes a captcha at the payment step. Share the cart link; checkout takes it from there.
- **Search the catalogue:** `https://core-electronics.com.au/search/{query}.md` (URL-encode the query; pages 2-3 at `search/{query}/{page}.md`; `search.md?q=` also works)
- **Payment methods, purchase orders, policies and contact details:** https://core-electronics.com.au/llms.txt
## Description

Tired of wilted plants? Automate your troubles away with this soil moisture sensor!

This sensor reduces corrosion by sensing water capacitively instead of resistively, so water never comes into direct contact with the metal portion of the sensor.

You'll need [an analog-to-digital](https://core-electronics.com.au/breakout-boards-and-modules.html#category_203) converter to get this sensor working with [a Raspberry Pi](https://core-electronics.com.au/raspberry-pi.html#category_272).

To calibrate the sensor, record the reading when completely dry, and immerse the sensor in water, recording the result (making sure not to get the capacitors and resistors wet).

Map between the two values and experiment with thresholds for each plant!

### Specifications

- Operating voltage: 3.3V - 5.0V
- Current Consumption: 5.68mA
- Analog output that varies between 0V and your supply voltage (so if your ADC can only handle 3.3V, supply this module with 3.3V)
 
### Shipping List

- Soil moisture sensor
- Dupont adapter cable

### Examples

#### Raspberry Pi Pico - Micropython

 ```
import machine
from time import sleep

soil_moisture = machine.ADC(28)

# A handy function for mapping values
def map_range(x, in_min, in_max, out_min, out_max):
    mapped = (x - in_min) * (out_max - out_min) / (in_max - in_min) + out_min
    return int(max(min(mapped, out_max), out_min))

while True:
    soil_moisture_raw_reading = soil_moisture.read_u16()
#     print(soil_moisture_raw_reading)

    soil_moisture_filtered_reading = map_range(soil_moisture_raw_reading, 15000, 50000, 0, 100)
    print(soil_moisture_filtered_reading)
    sleep(0.5)
```

## Images

- [Product image 1](https://core-electronics.com.au/media/catalog/product/s/n/sny09804-edit.jpg)