I have soil Moisture sensor inserted into the pot soil, wet in state. (not too damp) and soil moisture sensor is connected to Arduino Mega 2560.
This is the soil moisture sensor I am using:
Soil Moisture Sensor VCC is fed by 4.95 coming from Mega's 5 volt power out and soil moisture signal is connected to A0.
below are the readings
+---------------------+-------------------+-----------------------+
| timeStamp | pot1_soilMoisture | pot1_avg_soilMoisture |
+---------------------+-------------------+-----------------------+
| 2017-01-26 14:31:19 | 825 | 80 |
| 2017-01-26 14:32:19 | 816 | 80 |
| 2017-01-26 14:33:20 | 828 | 83 |
| 2017-01-26 14:34:20 | 826 | 82 |
| 2017-01-26 14:35:20 | 820 | 79 |
| 2017-01-26 14:36:20 | 833 | 83 |
| 2017-01-26 14:37:20 | 463 | 46 |
| 2017-01-26 14:38:21 | 546 | 32 |
| 2017-01-26 14:39:21 | 156 | 26 |
| 2017-01-26 14:40:21 | 157 | 22 |
| 2017-01-26 14:41:21 | 509 | 23 |
| 2017-01-26 14:42:22 | 204 | 25 |
| 2017-01-26 14:43:21 | 226 | 26 |
| 2017-01-26 14:44:21 | 190 | 30 |
| 2017-01-26 14:45:22 | 1023 | 84 |
| 2017-01-26 14:46:22 | 604 | 83 |
| 2017-01-26 14:47:22 | 773 | 79 |
| 2017-01-26 14:48:22 | 1023 | 80 |
| 2017-01-26 14:49:23 | 599 | 77 |
| 2017-01-26 14:50:23 | 766 | 82 |
| 2017-01-26 14:51:23 | 579 | 81 |
| 2017-01-26 14:52:23 | 729 | 74 |
| 2017-01-26 14:53:24 | 1023 | 82 |
| 2017-01-26 14:54:24 | 795 | 80 |
| 2017-01-26 14:55:24 | 651 | 77 |
| 2017-01-26 14:56:24 | 765 | 83 |
| 2017-01-26 14:57:25 | 1023 | 81 |
| 2017-01-26 14:58:25 | 0 | 60 |
| 2017-01-26 14:59:25 | 921 | 30 |
+---------------------+-------------------+-----------------------+
1439 rows in set (0.02 sec)
I got three kind of readings of the sensor:
pot1_soilMoisture
reading from 825 to 833 is when the sensor was dipped in water.pot1_soilMoisture
reading from 463 to 190-1023 is when soil moisture sensor was in air.pot1_soilMoisture
reading from 604 to last 921 is when soil moisture sensor is in soil. The soil is moist/wet.
I don't understand how to be definitive state of soil with such values?