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+--- Thread: Soil moisture sensors (/showthread.php?tid=7951)
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Soil moisture sensors - xarouli5 - 04-18-2025
I bought the next sensor to experiment:
Soil Moisture Sensor
https://a.aliexpress.com/_ExqUPDK
Powered 3.3v, gnd and tried AO on AI (9-16) & DO on DI (1-8). No change seen on inputs of AIO when I dipped sensor in water and out.
Any ideas?
RE: Soil moisture sensors - admin - 04-19-2025
KC868-AIO analog input use by 0-5v dc or 4-20mA signal, make sure your sensor is this type.
RE: Soil moisture sensors - xarouli5 - 04-22-2025
My sensor is 0-5v.
Actually when I check with my multimeter I see 0.52v dipped in water and 3.08v out of water.
But when I plug the Analog in to Analog in 1-8, I do not see any changes in voltage in AI1-AI8.
I use the GND of analog and power from 3.3v.
Why?
RE: Soil moisture sensors - xarouli5 - 04-22-2025
My sensor is 0-5v.
Actually when I check with my multimeter I see 0.52v dipped in water and 3.08v out of water.
But when I plug the Analog in to Analog in 1-8, I do not see any changes in voltage in AI1-AI8.
I use the GND of analog and power from 3.3v.
Why?
My troubleshooting:
I tried a voltage/current generator (https://a.aliexpress.com/_EwgS75o) with external power source and I get voltage measurement on my board (868-AIO), so board is working. Also tried DI and works but that doesn’t matter.
I rechecked my soil sensor output with multimeter (when NOT connected with 868-AIO) and sensor output still works.
I tried to take sensor’s GND both from main GND of board and AI GND. Same result. No input from sensor into board.
I connected the DO of sensor to board and board reacts (change in voltage) to signal. Only of course 2 voltages not an analog out.
I messed around with sensor's potentiometer, still nothing.
I tried external power source to 4volts still the same. No input in any channel I try in the board, normal input on multimeter. Inputs of board working.
My only idea is if I can “multiply” reading of input but does not make any sense.
Any ideas?
RE: Soil moisture sensors - admin - 04-22-2025
The sensor's load-bearing capacity is weak, please choose a high-quality sensor. only 1usd for sensor, it's too cheap solution.
this is our sensor: https://shop.kincony.com/products/soil-temperature-and-humidity-sensor
RE: Soil moisture sensors - xarouli5 - 04-23-2025
How the load bearing capacity of a sensor affects that the 868-AIO does not measure input from a sensor?
Is ot possoble that it need attenuation amd/or multiply of input?
Also if we need 10 soil sensors, we cannot pay 600usd + shipping, only for your sensors. Way too expensive.
RE: Soil moisture sensors - admin - 04-23-2025
how long cable you are using?
RE: Soil moisture sensors - xarouli5 - 04-23-2025
20cm cable. Practically to test tge sensor and inputs.
RE: Soil moisture sensors - admin - 04-23-2025
it's too long.
RE: Soil moisture sensors - xarouli5 - 04-23-2025
20 CENTIMETERS! Not meters.