This document describes a temperature monitoring device that uses 4 LM35 temperature sensors to measure temperature in each corner of a room. The temperatures are displayed on an LCD screen and recorded by an Arduino Uno onto a micro SD card stored in .txt files. The summaries are stored minute-by-minute for long term monitoring and analysis of temperature changes in the room.

1. MONITORING TEMPERATURE
RUANGAN DENGAN DISPLAY LCD
DAN RECORDING
MOCH. REZKI SELAMET
MOKH IMAM NUGROHO
SITI HARYANI
YUDA WARDIANA

2. LATAR BELAKANG
Dalam suatu pengukuran temperature kita biasanya
menunggu guna memperoleh data tiap menit. Tetapi
kadang kala kita selalu meniggalkan pengukuran karena
ada kegiatan lain yang sama penting. Karna itu alat ini dibuat
untuk menyimpan data temperature supaya data pengukuran
tersimpan walaupun kita tinggalkan.

3. TUJUAN
 Dapat mengetahui suhu ruangan yang terukur
 Dapat menyimpan data temperature
 Dapat mengetahui perubahan suhu ruangan
 Dapat menganalisis data yang tersimpan guna
keperluaan akademik

4. DESKRIPSI ALAT
Alat ini mempunyai 4 buah sensor LM35 yang
ditempatkan pada tiap sudut ruangan ditampilkan pada
display LCD dan di record oleh arduino uno. Penyimpanan
data dengan micro sd module shield dan di simpan oleh
memori micro sd menit permenit temperaturenya. Data
yang disimpan oleh micro sd module berbentuk
.txt(notepad).

5. Alat Dan Bahan
 Arduino Uno

6. LM 35
LM35 TEMPERATURE SENSOR IS ONE TYPE OF SENSOR THAT
CONVERTS ELECTRICAL QUANTITIES TO THE TEMPERATURE SCALE
IN THE FORM OF VOLTAGE. LM35 HAS 3 PIECES PIN LEGS, PIN TO
INPUT POSITIVE VOLTAGE (+), PIN OUTPUT, INPUT PIN NEGATIVE
VOLTAGE / GND (-).

8. LM 35
HOW the LM 35 measure???
Can operate at a voltage of 4 volts to 30 volts. Each
temperature of 1 degree Celsius will show a voltage of 10
mV.
equation:
Vout = 10 mV / 1ºC
That is, if the read voltage Vout = 500 mV, then the
temperature = 500mv / 10mV = 50ºC.

9. 35 ºC
Vout = 10 mV / 1ºC
That is, if the read voltage Vout = 500 mV, then the temperature = 500mv
/ 10mV = 50ºC.
EXAMPLE

10. Arduino use sensor LM 35
Read the output of LM35 goes into analog pin, Read data
already in the form of ADC conversion
Converting ADC = Vout / Vref * 1023
So it's not in the form of voltage magnitude again If
you want to know the LM35 output voltage using the
formula above:
Read voltage = Conversion ADC voltage reference * /
1024

11. MICRO SD SHIELD
The module (MicroSD Card Adapter) is a Micro SD card reader
module, and the SPI interface via the file system driver, microcontroller
system to complete the Micro SD card read and write files. Users can
directly use the Arduino IDE comes with an SD card to complete the
library card initialization and read-write

12. Features:
 Support Micro SD Card, Micro SDHC card (high-speed card)
 The level conversion circuit board that can interface level is 5V or 3.3V
 Power supply is 4.5V ~ 5.5V, 3.3V voltage regulator circuit board
 Communication interface is a standard SPI interface
 4 M2 screw positioning holes for easy installation
 Control Interface: A total of six pins (GND, VCC, MISO, MOSI, SCK, CS), GND to ground, VCC is the power
supply, MISO, MOSI, SCK is the SPI bus, CS is the chip select signal pin;
 3.3V regulator circuit: LDO regulator output 3.3V as level converter chip, Micro SD card supply
 Level conversion circuit: Micro SD card into the direction of signals into 3.3V, MicroSD card toward the
direction of the control interface MISO signal is also converted to 3.3V, general AVR microcontroller
system can read the signal
 Micro SD card connector: yes since the bomb deck for easy card insertion and removal
 Positioning holes: 4 M2 screws positioning hole diameter of 2.2mm, the module is easy to install
positioning, to achieve inter-module combination
Mirco SD Card Interface Module :(the last picture show)
 -Control Interface : A total of six pins (GND, VCC, MISO, MOSI, SCK, CS), GND to ground , VCC is the
power supply , MISO, MOSI, SCK is SPI bus , CS is the chip select signal pin
 3.3V voltage regulator circuit : LDO regulator output is 3.3V level converter chip , Micro SD card supply
 Level conversion circuit : Micro SD card into the direction of the signal is converted to 3.3V, MicroSD card
interfaces to control the direction of the MISO signal is also converted into 3.3V, general AVR
microcontroller system can read the signal ;
 Micro SD card connector : a self- bomb deck , easy card insertion .
 Positioning holes : 4 M2 screws positioning hole diameter is 2.2mm, the positioning of the module is easy
to install , to achieve inter- module combination ;

13. LCD AND BACKPACK
This is another great LCD display compatible with I2C
bus and Gadgeteer modules. With limited pin resources,
your project will quicly run out of resources using normal
LCDs. With this I2C interface LCD module, you only need
2 lines (I2C)to display the information.If you already have
I2C devices in your project, this LCD module actually cost
no more resources at all. The adress can be set from
0x20-0x27.Fantastic for Arduino or gadgeteer based
projects.

14. Specifications LCD
•Supply voltage: 5V
•I2C Address:0x20-0x27(0x20 default)
•Back lit (Blue with white char color)
•Interface:I2C/TWI x1,Gadgeteer interface x2
•Adjustable contrast
•Size:82x35x18 mm
Specifications Bacpack PCF8574
• Compatible With Most Microcontrollers
• Low Standby-Current Consumption10 mA Max
• Latched Outputs With High-Current Drive
• I2C to Parallel-Port Expander Capability for Directly
Driving LEDs
• Open-Drain Interrupt Output
• Latch-Up Performance Exceeds 100 mA Per
JESD 78, Class II

15. RTC DS1302
A Real Time Clock Module with battery backup using the easy to
use DS1302 chip. The DS1302 chip uses a simple serial interface (see
datasheet) and example code is available for Arduino, Raspberry Pi
and many others.

16.  Features
 Real-Time Clock Counts Seconds, Minutes, Hours, Date of the
Month, Month, Day of the Week, and Year with Leap-Year
Compensation Valid Up to 2100
 Serial I/O for Minimum Pin Count
 2.0V to 5.5V Full Operation
 Uses Less than 300nA at 2.0V
 Single-Byte or Multiple-Byte (Burst Mode) Data Transfer for Read
or Write of Clock or RAM Data
 Board Size: 44mm x 24mm

17. Desain Project

18. LANGKAH MERANGKAI
 Siapkan alat dan bahan termasuk wadah misting
 Wadah misting lubangi untuk keperluan shield micro
sd dan arduino
 Buat jalur rangkaian pcb untuk pembagian tegangan
dan konektor pin arduino
 Rangkai seperti gambar
 Up load script data pada arduino.

19. SCRIPT ARDUINO#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <SD.h>
#include <DS1302.h>
File myFile;
LiquidCrystal_I2C lcd(0x27, 16,2);
float tempc;
float tempc1;
float tempc2;
float tempc3;
int tempin = 0;
int tempin1 = 1;
int tempin2= 2;
int tempin3 = 3;
int a=1;
int b;
DS1302 rtc(2, 3, 5);

20. void setup()
{
lcd.begin();
Serial.begin(9600);
while (!Serial) {
; // wait for serial port to connect. Needed for Leonardo only
}
Serial.print("Initializing SD card...");
// On the Ethernet Shield, CS is pin 4. It's set as an output by default.
// Note that even if it's not used as the CS pin, the hardware SS pin
// (10 on most Arduino boards, 53 on the Mega) must be left as an output
// or the SD library functions will not work.
pinMode(10, OUTPUT);
if (!SD.begin(4)) {
Serial.println("initialization failed!");
return;
}
rtc.halt(false);
rtc.writeProtect(false);
}

21. void loop()
{
tempc= analogRead(tempin);
tempc= (5*tempc*100)/1024;
tempc1= analogRead(tempin1);
tempc1= (5*tempc1*100)/1024;
tempc2= analogRead(tempin2);
tempc2= (5*tempc2*100)/1024;
tempc3= analogRead(tempin3);
tempc3= (5*tempc3*100)/1024;
b=a++;
lcd.backlight();
lcd.setCursor(0,0);
lcd.print(b);

22. lcd.setCursor(3,0);
lcd.print(tempc,1);
lcd.setCursor(10,0);
lcd.print(tempc1,1);
lcd.setCursor(3,1);
lcd.print(tempc2,1);
lcd.setCursor(10,1);
lcd.print(tempc3,1);
Serial.println("initialization done.");
myFile = SD.open("T1A1.txt", FILE_WRITE);
if (myFile)
{
Serial.print("Writing to T1A1.txt...");

23. myFile.println(rtc.getDOWStr());
myFile.println(" ");
myFile.println(rtc.getDateStr());
myFile.println(" -- ");
myFile.println(rtc.getTimeStr());
myFile.println("T('C)= ");
myFile.println(tempc);
myFile.print("T1 ('C)= ");
myFile.println(tempc1);
myFile.print("T2 ('C)= ");
myFile.println(tempc2);
myFile.print("T3 ('C)= ");
myFile.println(tempc3);
myFile.println("---------------------------------------------------");
myFile.close();
Serial.println("done.");
}

24. else
{
Serial.println("error opening T1A1.txt");
}
myFile = SD.open("T1A1.txt");
if (myFile) {
Serial.println("T1A1.txt:");
while (myFile.available()) {
Serial.write(myFile.read());
}
myFile.close();
} else {
Serial.println("error opening T1A1.txt");
}
delay(5000);
}

25. LANGKAH PENGUJIAN DAN
DATA PENGUJIAN
Selama 2 jam pengukuran dengan waktu 1 menit
penyimpanan data yang tersimpan 21 kb sedangkan
memori 1.949.302kb.
1hari data=24jam/2jam=12x21kb=252kb/hari
1.949.302kb/252kb/hari=7.735hari
7.735/365=21 tahun

26. KESIMPULAN DAN SARAN
 Data temperature lm35 yang terbaca oleh arduino
harus di ubah ke ADC supaya bisa terukur suhunya
oleh arduino.
 Data yang tersimpan oleh shield micro sd berupa
txt(notepad)
 Backpack yang terpasang pada lcd berguna untuk
memperkecil pin pada lcd
Saran
Untuk mempermudah sambungan pin dan untuk
menempel dengan benar seharusnya dipasan terminal
untuk memperkuat sambungan