AUTOMATIC DC FAN USING LM35

Base on Arduinofor Green House

English version

made by :

M. Daddy Refa M (151611015)Nurlatifa Haulaini (151611019)

Ronito Halason (151611027)

Description

– We used LM35 as a temperature censor, the result of the measurements are displayed on the LCD

– We used 2 DC Fan 12 volt, one for exhaust fan and another fan as a supply fan

– When the value of temperature under 20°C, LED white will shine and no fan is working

– When the value of temperature around 26°C until 29°C, LED white and yellow will shine, and supply fan will be working

– When the value of temperature above 30°C, LED red and white will shine, supply fan and exhaust fan will be working

Source

– https://www.youtube.com/watch?v=18krZsFRzzY

The Equipment

Arduino UNO LED : white, red and

yellow LCD Diode Resistor Wire Trafo

DC Fan 12 volt PCB Relay Module Solder LM35

Arduino UNO R3

Consists of : 14 pin digital input/output 6 input analog Mikrokontroler ATmega328 Koneksi USB Power jack ICSP header Reset button

Arduino UNO is a microcontroller board based on ATmega328

Diode

Diode are used for a half wave rectifier

AC current wave must be rectified because we need a dc current

The negative part connected to the fan and positive part to the relay to occur forward current

LED are diode that can emit light LED are used as an indicator in

green house Red light indicates that the

temperature gets too hot Yellow light indicates that the

temperature in the normal condition

White light indicates that the program are working

LM35

The function : to change the temperature scale into electrical quantities in the form of voltage

The value of voltage : 5V Has a calibration accuracy of 0.5°C

when the temperature 25°C Has a maximum range of temperature

around -55°C until 150°C Has a three plugs, the right side

connected to GND, the left side connected to 5V, and the middle to A0

LCD

Liquid Crystal Display (LCD)

LCD is a flat panel display or other electronic visual display that use the light modulating properties of liquid crystals.• Consist 16 character and 2 row• can be observe with a 4 bit mode or

8 bit mode• Equipped with back light• In this project, LCD use to display the

value of temperature

Resistor

Resistor is electronic component that serve to hold electric current.

Because of electrical currents connected to electric voltage so that

when voltage is passed across the resistor, there will be a decrease in

that voltage.

Trafo

Fan

• DC fan 12 volt• The size : 12 cm x 12 cm• We used 2 fan, one for

exhaust fan and another one for supply fan

Relay Module

• Relay is switch are operated electrically

• Relay has two electromechanical components, witch consist of two main parts they are electromagnetic (coil) and mechanical (set contact switches)

• Principle of electromagnetic relay use to move the switch contacts so that when the electric current is small (low power), it can conduct electricity with a higher voltage

Wood Jumper

Object Censor LM35

Arduino UNO

Actuator Supply fan Exhaust fan

DisplayLCD

IndicatorLED white

LED redLED yellow

To control the Arduino, we must input the program by using software Arduino IDE. First we should adapt the COM of the Arduino with our software. Then, we should choose the same board between the Arduino and the software . F.or example : Board Arduino Genuino, COM 3)

The trouble when making “Automatic DC Fan”

– We must add the trafo and diodes because the current sources from Arduino UNO only 5V but we need current sources more than that

– It takes a lot of wire to connected the LCD with Arduino, so we decide to change the wire and we use I2C

– we need to change the program on IDE because we use I2C