
Home Automation using Smartphone
This project will show you how to automate your home using your Smartphone.
Monitoring plant health is very important for their fast growth. In this busy world, people usually forget to water their plants which leads to bad growth and health of their plants. For ensuring complete development of plants it is necessary to develop proper surrounding conditions in which plants grow. We are now going to make a small DIY Plant Monitoring system whose data will be displayed on the evive screen. The evive screen will display the following data:
Image | Component | Quantity | Available in Kit |
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![]() | evive | 1 | |
![]() | 12C 2A DC Adapter | 1 | |
![]() | USB A-B Cable | 1 | |
![]() | Temperature and Humidity Sensor | 1 | |
![]() | evive | 1 | |
![]() | Soil Moisture Sensor | 1 | |
![]() | 10 kOhm Resistor | 1 | |
![]() | Male to Female Jumper Cable 20cm | 6 | |
![]() | Male to Male Jumper Cable 20cm | 3 |
LDR (wikipedia) are light sensitive devices most often used to indicate the presence or absence of light or to measure the light intensity. An LDR can be applied in light-sensitive detector circuits and light-activated and dark-activated switching circuits.
How does LDR sensor work?
The resistance of a photoresistor decreases with increasing incident light intensity. In other words, it exhibits photoconductivity. A photoresistor is made of a high resistance semiconductor. In the dark, a photoresistor can have a resistance as high as several megohms (MΩ), while in the light, a photoresistor can have a resistance as low as a few hundred ohms.
The circuit of LDR sensor is explained below
One end of LDR is connected through jumper wire(red wire ) to the 5V power supply in the evive board.
Another end of LDR is soldered with 10K resistor. Through the common junction of LDR and 10K resistor, a jumper wire is taken and hooked into the analog input(here we have used A1 pin number in the evive board) of the evive board.
The free end of the resistor is grounded with the help jumper wire(to make it more attractive the circuit can be placed inside the straw).
Soil moisture sensors (Wikipedia) measure the volumetric water content in the soil. The two probes of moisture sensor are connected to LM293 comparator. This sensor uses the two probes to pass current through the soil, and then it reads that resistance to get the moisture level.
How does soil moisture sensor work?
The Soil Moisture Sensor uses capacitance to measure the water content of soil (by measuring the dielectric permittivity of the soil, which is a function of the water content).M393 IC do the voltage comparing here, a reference voltage (UR) is set by the adjustable potentiometer, when the analog output value over this value, the LM393 comparator will output a digital value to indicate this sensor is triggered by reaching this setup threshold.For more visit soil-moisture-sensor-interfacing-evive
The circuit of soil moisture sensor is explained below:
DHT11 is a temperature and humidity sensor which uses a capacitive humidity sensor and a thermistor to measure the surrounding air and spits out a digital signal on the data pin (no analog input pins needed).
How does Humidity and temperature sensor work?
The DHT11 Humidity and Temperature Sensor consists of 3 main components. A resistive type humidity sensor, an NTC (negative temperature coefficient) thermistor (to measure the temperature) and an 8-bit microcontroller, which converts the analog signals from both the sensors and send out single digital signal.
The connections between humidity and temperature sensor are explained below
After the circuit has been set up upload the Arduino code. The data will be displayed on your evive screen.
The values of the soil moisture sensor, plant temperature and humidity and energy state is displayed on the evive screen.
Description | Circuit Diagram |
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The sensors are connected as shown in the circuit diagram. Moisture sensor and LDR sensor are connected to analog pin A0 and A1 respectively whereas Humidity Temperature sensor is connected to digital pin 2. | ![]() |
Description | Download Code |
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Arduino Code for Plant Monitoring System and required Libraries | Download |
evive Library | Download |
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