ARDUINO MOISTURE SENSOR AND IRRIGATION SYSTEM

I would like to create an automated system that uses Arduino UNO for irrigation.

I have dht sensors setup in the field, soil-moisture content should be detected and read to the Arduino. If the moisture content is below a certain value, irrigation is supposed to take place.

Anyone who can help me in how i am supposed to setup the sensors and the code. I will be using zigbee for transmission

Does this get you started ?

6v6gt:
Does this get you started ?

Thank You For that but I need something more solid like how to set-up and link zigbee with the sensor, and also, the Arduino sketch for reading sensor values

DOES THE UNIT NEED TO SHOUT AS WELL?

Johnny010:
DOES THE UNIT NEED TO SHOUT AS WELL?

YES

I have thought about traces on a board and a R/C circuit to do capacitance sensing of soil moisture. the contact/resistance sensors do not seem to be long term devices.

I am curious how you would use a DHT sensor for soil moisture. or are you just doing air humidity ?