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Arduino based Automatic Plant Irrigation System with Message Alert

Whenever we go out of town for few days, we always used to worry about our plants as they need water on regular basis. So here we are making Automatic Plant Irrigation System using Arduino, which automatically provides water to your plants and keep you updated by sending message to your cell phone.

Whenever we go out of town for few days, we always used to worry about our plants as they need water on regular basis. So here we are making Automatic Plant Irrigation System using Arduino, which automatically provides water to your plants and keep you updated by sending message to your cell phone.  In This Plant Watering System, Soil Moisture Sensor checks the moisture level in the soil and if moisture level is low then Arduino switches On a water pump to provide water to the plant. Water pump gets automatically off when system finds enough moisture in the soil. Whenever system switched On or off the pump, a message is sent to the user via GSM module, updating the status of water pump and soil moisture. This system is very useful in Farms, gardens, home etc. This system is completely automated and there is no need for any human intervention.

In This Plant Watering System, Soil Moisture Sensor checks the moisture level in the soil and if moisture level is low then Arduino switches On a water pump to provide water to the plant. Water pump gets automatically off when system finds enough moisture in the soil. Whenever system switched On or off the pump, a message is sent to the user via GSM module, updating the status of water pump and soil moisture. This system is very useful in Farms, gardens, home etc. This system is completely automated and there is no need for any human intervention.

Required Components:

  • Arduino Uno
  • GSM Module
  • Transistor BC547 (2)
  • Connecting wires
  • 16×2 LCD (optional)
  • Power supply 12v 1A
  • Relay 12v
  • Water cooler pump
  • Soil Moisture Sensor
  • Resistors (1k, 10k)
  • Variable Resister (10k, 100k)
  • Terminal connector
  • Voltage Regulator IC LM317

GSM Module:

Here we have used TTL SIM800 GSM module. The SIM800 is a complete Quad-band GSM/GPRS Module which can be embedded easily by customer or hobbyist. SIM900 GSM Module provides an industry-standard interface; the SIM800 delivers GSM/GPRS 850/900/1800/1900MHz performance for voice, SMS, Data with low power consumption. The design of this SIM800 GSM Module is slim and compact. It is easily available in the market or online from eBay.

  • Quad – band GSM/GPRS module in small size.
  • GPRS Enabled
  • TTL Output
Arduino based Automatic Plant Irrigation System with Message Alert

Learn more about GSM module and AT commands here. Also check our various projects using GSM and Arduino for properly understand their interfacing.

Circuit Explanation:

In this Plant Irrigation System, we have used a Homemade Soil Moisture Sensor Probe to sense the soil moisture level. To make probe, we have cut and etched a Copper clad Board according to the Picture shown below. One side of the probe is directly connected to Vcc and other probe terminal goes to the base of BC547 transistor. A potentiometer is connected to the base of the transistor to adjust the sensitivity of the sensor.

Arduino is used for controlling whole the process of this Automatic Plant Watering System. The output of soil sensor circuit is directly connected to digital pin D7 of Arduino. A LED is used at the sensor circuit, this LED’s ON state indicates the presence of moisture in the soil and OFF state indicates the absense of moisture in the soil.

GSM module is used for sending SMS to the user. Here we have used TTL SIM800 GSM module, which gives and takes TTL logic directly (user may use any GSM module). A LM317 Voltage regulator is used to power the SIM800 GSM module. LM317 is very sensitive to voltage rating and it is recommended to read its datasheet before use. Its operating voltage rating is 3.8v to 4.2v (please prefer 3.8v to operate it). Below is the Circuit Diagram of Power Supply given to the TTL sim800 GSM Module:

Required Components:      Arduino Uno     GSM Module     Transistor BC547 (2)     Connecting wires     16x2 LCD (optional)     Power supply 12v 1A     Relay 12v     Water cooler pump     Soil Moisture Sensor      Resistors (1k, 10k)     Variable Resister (10k, 100k)     Terminal connector     Voltage Regulator IC LM317  GSM Module:  Here we have used TTL SIM800 GSM module. The SIM800 is a complete Quad-band GSM/GPRS Module which can be embedded easily by customer or hobbyist. SIM900 GSM Module provides an industry-standard interface; the SIM800 delivers GSM/GPRS 850/900/1800/1900MHz performance for voice, SMS, Data with low power consumption. The design of this SIM800 GSM Module is slim and compact. It is easily available in the market or online from eBay.

If user wants to use SIM900 TTL Module then he should use 5V and if the user wants to use SIM900 Module then apply 12v in the DC Jack slot of the board.

A 12V Relay is used to control the 220VAC small water pump. The relay is driven by a BC547 Transistor which is further connected to digital pin 11 of Arduino.

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