Final version ready to ship. Circuit protected with water proof molded case. Sensor totally water proof and can be buried. No more adjusts needed, just plug and play. It will be shipped final version!

What is it?

A capacitive soil sensor capable of detecting water content / moisture of soil. Based on 80MHz operation transparent to minerals. Stable over many soils including biological soil. Very precise. Based on cylindrical field measuring. Ultra low power 25mA power consumption. 2.8V to 5V supply A simple soil sensor to get same precision of other high cost sensors on market. High quality four layer probe pcb (copper coplanar traces inside pcb, ultra durable probe, water proof, wear resistant (other moisture sensors use 2 layer pcb and scratch will expose outside copper damaging probe and unpredictable readings ))

Why did you make it?

Plants need care and precise sensor to measure water content of soil. Most soil sensors use low frequency (few KHz to few MHz) and get influenced by minerals/nutrients inner soil giving un-precise measurements and do not have any range (low frequency only measure near close to pcb, no range so measuring is non precise and influenced by minerals/nutrients available on soil). This one is low cost, low power, precise, non sensible to minerals availability on soil.

What makes it special?

• Operation at 80MHz transparent to minerals/nutrients availability on soil. Stable on many soils including sand, biological soil etc. Detects water content /moisture ( volumetric water content ).
• Low power consumption only 25mA at 3.3V
• Voltage range 2,8V to 5V
• Output voltage 0V to 1V or 0 to 3V
• Suitable for measuring surrounding dielectric (equivalent to soil moisture).
• Plant watering based on precise reflectometry measure ( Frequency Domain Reflectometry FDR / capacitance ) .

-See all pictures to better understand concept of volumetric(cylindrical) water content measure and mineral transparency linear graph at higher frequencies.

EU stock. Shipped from Portugal. Around 2week delivery

Contact for questions or ideas or if you have any question about electronics: vitomj at sapo.pt

Thank you for your time. Please see my other great items on my store Click here to visit my store

Also, check out my video from a wireless network of sensors and outputs project.