Soil Moisture Irrigation

12V Soil Moisture Sensor Controller Irrigation System Automatic Watering Module Model: XH - M214 was purchased from eBay .This module comes with a sensor printed circuit board type probe in this project the probe has been replaced with the home-made soil moisture block sensor which is placed in the root system.

Description:

This module has a digital display of the soil moisture. When the soil moisture is below the set value starting pump starts watering, when soil moisture reaches the set value to stop watering. The operation is very simple.

Parameters:

Product name:Soil Moisture Controller Module

Model: XH - M214

Power supply voltage: DC 12 V

Output Relay : Output switch

soil moisture range: 20-99%

Control precision: 1%

Control current: 10 A

Net weight: About 28 g

Size: 52 * 43 * 16 mm

Water switch off the value (F0)

Press [SET] (F0) then press [SET] again, (80) this is the settings For the water controller to be in the off state. eg (80) use the + and the - button to increase or decrease the value.

eg When the soil moisture sensor drops below

the value eg. (80) the controller Programme will Activate the next step

Water switch on (F1)

Press [SET] (F0) then [+] (F1) then [SET] (74) this is the settings to swich on the water eg (74) use the + and the - button to increase or decrease the value.

eg When the soil sensor reaches the value of (80) the controller will switch off the relay ( turn off the solenoid valve water switch)

Calibration settings (F2)

Press [set] (F0) then [+] (F1) then [+] (F2) then press [SET] (00)

set (00) use the + and the - button to increase or decrease the value this is used for a sensor offset.

If you intend to use the control module out side you must mount the module in a waterproof box with cable glands. The controller will need 12vdc power and a 12vdc solenoid valve which the controller will use to allow the water to flow in to the Irrigation tubing .

First cutoff the pcb type probe sensor then connect the new soil moisture sensor block make sure you have a long enough cable on the soil sensor to go down to the depth of the plant root system.

Next Prepare the soil moisture sensor before you use it. Soak soil moisture sensor over night in rain water then make a small hole down to the plant root system depth, push the sensor in and back fill with wet soil. Pack the hole tight as possible.

the controller as a red number display

0 =bone dry

99=saturated

The soil sensor will need to equalise to the soil moisture this may take some time. The display read out will show the wetness of the soil, keep checking the soil, you need to find the optimum wetness for your soil type and the type of plants