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Resistive Soil Moisture Sensor
Digital Analog Signal Output for Arduino
The probe uses analog resistance to detect the moisture content of the soil. It is a good plant helper to make you know if your plants are thirsty and it can also be used in the automatic watering system, garden, greenhouse, etc
A waterproof sensor probe with high corrosion resistance ensures a long lifetime of at least 6 months in the soil.
- For those who are not sure how to use these, we would suggest looking into how to use these online. The voltage required, analog reading, etc.
Digital Value Output
This soil moisture detector outputs a low level from the DO port when the detecting humidity reaches the threshold value. Good to work with Arduino/Raspberry Pi.
Analog Value Output
The AO port on the soil humidity sensor outputs an analog value(voltage), and you can acquire the real-time data via the AD port of your single-chip microcomputer(MCU).
Adjustable Threshold
Clockwise/counter-clockwise rotate the blue potentiometer to increase/reduce the detection threshold. On-board power and signal indicator make you know the working status of the board at a glance at any time.
Instruction:
1."+" connects power positive; "-" goes to negative. Don't connect reversely or the chip will be burnt out. There is a LED power indicator at the P mark on the board. It will be light if the module operates normally.
2.Clockwise/counter-clockwise rotate the blue potentiometer to increase/reduce the detection threshold. For example, DO outputs low level when the moisture reaches 50% now, then I clockwise rotate the potentiometer to increase the detection threshold. At this time, DO outputs a low level only when the moisture reaches a point higher than 50%.
3. If you clockwise rotate the potentiometer to an extent that the LED indicator which marked "S" is light, that means the testing threshold has been surpassed. Counterclockwise rotating to the end surpasses the threshold too. The module will not work well if the detection threshold is invalid. NOTE: The threshold adjustment only works for using the DO output.
Specifications
- Working Voltage: DC 3.3-12V
- Working Current: <20mA (Output Current: <30mA)
- Board Size: 36x15x6mm/1.42X0.59X0.23 inch (L*W*H)
- Sensor Probe Length: 8.8cm/3.46 inch
- Sensor Pin Pitch: 5 mm
- Sensor Cable Length: 1.2 meters /3.94ft
- Sensor Connecting Port: XH2.54 2P
- DO Port: digital value output (DO output current is about 10mA)
- AO Port: analog value output
Package Included
- 2x Soil Moisture Sensor Module
- 2x Sensor Probes
Edward
Reviewed in the United States on April 11, 2024
After soldering the connector, it works pretty good with damp fingers. If it doesn't work well in the soil I will change the review.
Mike/Jamie Harris
Reviewed in the United States on August 12, 2023
I was hopping the bad reviews were just simply users who didnt know how to setup the sensors code. But I tried in Arduino IDE on ESP32/ESP8266/RPi/Arduino Mega and UNO... and also tried to code in ESPHOME in Home Assistant. Issue was I could not get any real reading..... I would get a good reading when I turned the power on, and then every second, it would go up and up and up to where is bassicly the same reading as the bars touching... I tested in cup of water, a cup of potting soil and flooding it/slowly pouring water in the moisten the soil, etc.... But I could not use it... I didnt want to use the PBC sensors as PCB's and putting in moist soil forever, does not last long at all.. so I'm back to the begining trying to get to measure the moisture in my garden for my automated watering that I would like to water on and off based on soil moisture
Solo recibi un medidor y ademas dañado
Reviewed in Mexico on July 4, 2023
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JS
Reviewed in the United States on May 20, 2023
This really works well, and is simple to connect. The only issue is finding code to work. You can Google a bit, but I needed something that worked on a Pico which has limited modules. I did find this tutorial which worked perfectly:If you Google: micropython Capacitive Soil Moisture SensorYou will find the tutorial I used.
Anon1844
Reviewed in the United States on November 15, 2023
Used these as part of a project to automate my garden irrigation this grow season. The readings were nearly as accurate after ~6 months in soil, with no cleaning of the probes. They key is to NOT keep power applied 24/7. I only checked soil moisture a few times a week, giving them about an hour for the measurement to settle after applying power. So, I only ran these for a few hours a week.
Kwis
Reviewed in the United States on March 7, 2022
Good quality that wont corrode over time. Was easy to use once you figure out how to use it. There is no instructions on connecting to Arduino module through Analog or exactly what the adjustment pot does.Both mine was also missing the plastic tubes that is supposed to water-proof it.. The description shows pictures and clearly says it has "Two Transparent rubber sleeves to prevent water from entering..." - these rubber sleeves are not present and missing.Also once, integrated, there is heavy drift on the readings over time.. it takes at least 5-10 minutes to reach a stable reading, so if you turn the probe off in between readings, its very inaccurate.
Customer
Reviewed in the United States on January 13, 2022
I am still testing the repeatability and reliability of readings. Device is easy to use and connects to a Raspberry Pico.
Vince Loschiavo
Reviewed in the United States on March 2, 2020
In today’s world of microcontrollers, there have been many inventions and designs concerning the communication over a Wi-Fi network between 2 or more gadgets. Since the appearance of the ESP8266, the Wi-Fi communication between 2 (or more) µC has never been easier. **(search for esp8266 and smartphone)** it will give information and a basic example of the NodeMCU-version of the ESP866 .All pieces necessary are available on Amazon.This wonderful piece of technology can be easily programmed in the Arduino IDE and works together with the Blynk-software. To understand and make use of it, I assume you need the basic knowledge of the Arduino µC & Arduino IDE.This purchase came with 2 of the soil moisture sensors. They can be controlled (monitored) by an esp8266 wifi microcontroller. This in turn can control your irrigation system.Using amicrocontroller, makes it extremely flexible whether you just want to keep the indications local (imagine 3 LEDs one red one yellow, and one green) that you set for each point on a defined scale. Or with the ESP 8266 to your smart phone to let you know it has reached the level.Investigate ESP8266 and smartphone for any code help
Roger C. Burchett
Reviewed in the United States on January 17, 2020
This product does what it says. I is easy to use to detect the moisture condition in plant soil, either to set off an alarm, turn on automatic watering, or display an analog moisture value using an Arduino or purpose-built circuitry.The down side is, that using a DC current to measure moisture drives an electrolytic action between the probes. Long-term, this can cause surface erosion and deposits on the electrodes, which degrades resistance measurements, making automatic monitoring or watering control problematic.There are several ways to overcome this:1: Insert the probe only briefly for measurement, then remove and wipe off before the next measurement.2: Arrange to swap probe polarity frequently, via a reversible plug, DPDT switch, relay, or similar.3:Change your Resistance measuring method to use (Floating) Alternating Current instead of Direct Current - this requires more elaborate electronics but should enable long-term unattended monitoring.As a fun project or occasional tool, this device is handy. Quality is good enough to make a long-term automated system, if some modifications are made.
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