Phantom YoYo Arduino compatible High Sensitivity Moisture Sensor
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|Brand Name||Phantom YoYo|
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This Moisture Sensor uses Immersion Gold which protects the nickel from oxidation. Electroless nickel immersion gold (ENIG) has several advantages over more conventional (and cheaper) surface platings such as HASL (solder), including excellent surface planarity (particularly helpful for PCB's with large BGA packages), good oxidation resistance, and usability for untreated contact surfaces such as membrane switches and contact points. This Moisture Sensor can read the amount of moisture present in the soil surrounding it. It's a low tech sensor, but ideal for monitoring an urban garden, or your pet plant's water level. This is a must have tool for a connected garden! This Moisture Sensor can be used to detect the moisture of soil or judge if there is water around the sensor, let the plants in your garden reach out for human help. They can be very to use, just insert it into the soil and then read it. With help of this sensor, it will be realizable to make the plant remind you : Hey, I am thirsty now, please give me some water. This Moisture Sensor uses the two probes to pass current through the soil, and then it reads that resistance to get the moisture level. More water makes the soil conduct electricity more easily (less resistance), while dry soil conducts electricity poorly (more resistance). It will be helpful to remind you to water your indoor plants or to monitor the soil moisture in your garden. The IO Expansion Shield is the perfect shield to connect this senor to Arduino. This item have low power consumption, and high sensitivity, which are the biggest characteristics of this mdoule. This item can be compatible with Arduino UNO,Arduino mega2560,Arduino ADK etc.
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These problems could be corrected by turning off the power when the sensor isn't needed, but my system isn't sophisticated enough for that. I'm going to use simple float switches in the future.
This is a great working product, but it has its limits. Do not use in situations where the sensor is constantly powered while submerged, or it will corrode shortly.
All the sensors I buy go to the same project, and run the same code - pull 3 samples every minute, average them, and report the value. Originally, these sensors would last 6 months before becoming noticeably oxidized and reporting more false readings. Now, they last about 2.
Nothing else has changed - they're still in the same herb containers, with the same herbs, and the same general watering pattern (2x/week).
I used to have them rated at 4 stars, since they come with no documentation, but I wanted to push down to 2 stars because they die so fast, so I decided to average them out.
Readings were fairly inconsistent as well.
I'd recommend a higher quality sensor for any project that needs longevity.
However, after having it in the soil for 2.5 days it has some corrosion on the prongs - so 4 stars.
I ran a soil test using this comparing to astore bought standalone garden moisture sensor that ranged from 1-10 (dry to wet).
In a cup of water I got an ADC max of 550-560; ---> 9-10 on the store meter.
In over saturated soil I got ADC reading of 545-550 -----> 7 on the store meter
In the mid range, for well moistened soil 480-500 ------> 5
Barely wetting the soil at all still gave a 400-450 -------> 1-3 on the store bought sensor
The range for results is just not good at all.
I need the dry moisture to give significantly different results from a cup of water. Maybe spreading the probes out more, different material for the probes? Not sure what design changes could yield better spread of measurements. It's just such a tight range, I'll have to use excessive coding to make up for it and spend more time calibrating than I should. I'm curious to know if the genuine sparkfun sensor is any different. It's just way to sensitive to the slightest amount of moisture, where I wanted sensitivity as being sensitive to Change in moisture (wider range in results).