how to make room temparature and humidity monitor

in this blog i am showing how to build your own room temparature and humidity monitering system...(a device that measures the humidity data and temperature data and logs it and displays it on a LCD screen)this system for somany applications like incubator,home automation etc....
so lets  gets started
                  

things needed

arduino uno r3
DHT11 SENSOR MODULE

16*2 lcd module
330 ohm resistor
jumper wires

first lets test the dht11 module
The DHT11 is a temperature and humidity sensor on one board, it easy to use with the arduino 
connect the arudino to the dht11 as follows
5V -- VCC of the sensor(2nd pin)
Gnd -- Gnd of the sensor(3rd pin)
D7 -- Signal or data pin of the sensor(1st pin)
after connecting upload the code and open serial moniter 
if everything works perfectly lets make our display
follow the circuit diagram
circuit diagram

again if everything works as expected  lets move to soldering
thats it.....

code and circuit

ANDROID APPLICATION CONTROLLED SIMPLE RGB LED DESKTOP LAMP

so in this tutorial i will show you how to controll rgb led with android smartphone
 RGB leds work on the basic concept of combination of the basic colors of any shade, that is, red, green and blue. All the colors have these elementary color components in them. Thus, we can make any color we want using a RGB LED
so i am going to controll the colours with my android smarphone .
things needed
1.arduino nano

2.hc 05 bluetooth module

3. common cathode rgb led

circuit diagram

breadboard testing

connect red to pin 8

green to pin 9

blue to pin10

common cathode to gnd

connect vcc of bluetooth module to 5v

connect gnd to gnd

tx to pin 2

rx to pin 3

soldering

code and circuit diagram
dowload remotexy from playstore and pair with bluetooth module
watch video

how to make arduino led desktop clock

In this blog i am going to show you how to build your own beautiful arduino clock
watch video

for this you will need following things
1) 54 LEDs. or 4 seven segment display

2) 12* 1n4148 diodes
3) 3 *470 ohm resistors
4) DS1307 real time clock IC.

to check ds1307 use thiscode 
5) 3Tact switches.

6) Prefboard 
7) ATMega328 with arduino bootloader.
8)16MHz crystal.
9) two 22pF caps.
10) 28 pin IC socket for the ATMega328.

11)10 k resistors
12)acrylic sheet
basics
The circuit uses the ATmega328p micro controller (the same as the Arduino uno board) and the DS1307 clock IC. You can easily set/change the time by pressing the setup buttons. It can be powered on with  USB cable from your computer 
circuit diagram

TESTING WITH SEVEN SEGMENT DISPLAY ON BREADBORD
FRITZING IMAGE

NOW ITS TIME TO BUILD CUSTUM BUID MATRIX DISPLAY
first we need leds  u can use any kind leds. i prefer milky ones
how to turn ordinary leds to milky leds

 using a sandpapper we can easily turn normal led to milky ones

 do this for all leds
SEE THE DIFFERENCE

NOW LETS CREATE CLOCKS FRONT PANEL
for this we need a led frame so i created a 3d model 

this print is done by eazyfab.com
you can print ur designs ineazyfab
 you download this from here front panel
now lets make led display

 arrange 3 leds as row and 5 leds for column follow the picture

 black dot represent the corresponing leds of 7 segment display
connect all anodes together(common anode)


                                                        

all didodes are 1n4148

CONNECT LED 1,2,3 TOGETHER.

CONNECT LED A AND 1 WITH 2 DIODES  THEN CONNECT TO DIGITAL PIN 2   .                                               LED  B AND 3  CONNECT   TO DP 3.

LED C AND 4 CONNECT DIRECTLY AND THEN CONNECT DP 4 WITH 470 OHM RESISTOR .

LED D CONNECT DP 5 WITH 470 OHM RESISTOR.

LED 5 AND E CONNECT TO DP 12.

LED F AND 6 CONNECT TO DP 7 .

LED G AND 5 CONECT TO DP 8.            

COMMON ANODE CONNECT TO DP PIN 6 .              

so this is the first digit of our clock for 2,3,4 digit  connect each and every led corresponds to no. and letter follow the circuit diagram

to save some  space we use standalone arduino circuit

arduino standalone circuit

now its time to soldering

now lets make the case

from black acrylic sheet i created the case and for front i used a a semitransperant sheet

finished 

final look

 arduino codeclock

happy making i will update more info soon .thanks