Digital Humidity Sensor With Lcd Display Using Microcontroller

1/20/2016

Di gital hum idi ty sensor wi th lcd displ ay using m icr ocontr ol l er

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Digital humidity sensor using PIC microcontroller  BILAL Malik  Ju Jully 28, 2014  29 Comments

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Page Contents Page Contents [hide hide]] 1 Digital humidity sensor with LCD display using PIC microcontroller 2 Applications of humidity sensors 3 Humidity sensor selection 4 How to use HS1101 humidity sensor 5 components list 6 Circuit diagram of humidity sensor 7 Coding:

DIGITAL HUMIDITY SENSOR WITH LCD DISPLAY USING PIC MICROCONTROLLER Digital humidity sensor with LCD display is used to measure relative percentage of water vapors in air. HS1101 capacitive http://mi cr ocontr ol ler sl ab.com/digi tal - humi di ty- sensor - usi ng- pi c- mi cr ocontr oll er /

PLEASE SUPPORT OUR WORK Our goal is to discover new solutions and provide working examples with 1/14

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Digital humidity sensor with lcd display using microcontroller

humidity sensor is interfaced with PIC16F877A microcontroller to measure humidity and LCD is used to display percentage humidity in air.For humans there is certain limit for water vapors

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presence in air. Above that limit relative humidity may cause problems to human health.

APPLICATIONS OF HUMIDITY SENSORS Humidity sensors have many application in industry and domestic areas. Humidity means presence of water vapors in air. Percentage of water vapors in air should be with in safety limit. Otherwise It have harmful physical and chemical effects on human beings and also in industrial products. Humidity sensors have major applications in agriculture ,chemical, oil, gas and medical industry. For example in agriculture industry humidity sensor is used to measure moisture in fields. There are also many other application of humidity sensor.You can search them in Google.

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HUMIDITY SENSOR SELECTION When you search on Google, you will come across many humidity sensors. All these humidity sensors have their advantage and disadvantage. But I used capacitive HS1101 humidity sensor in this project. What is meant by capacitive humidity sensor? All capactive senors give output in capacitive form.They change their capacitance with respect to change in sensing parameter like in HS1101 sensor sensing parameter is amount of water vapors in air. The reason why I used this humidity sensor? Because

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It can be used for highly sensitive applications. less cost easy to interface with microcontroller with small extra circuitry No calibration is required

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It can be easily used for home appliances and industrial control system.

HOW TO USE HS1101 HUMIDITY SENSOR HS1101 is a capacitive humidity sensor, so it can be used with 555 timer circuit to generate square wave of different frequency. I assume you know about 555 timer IC and its use. http://microcontrollerslab.com/digital-humidity-sensor-using-pic-microcontroller/

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microcontroller … Bluetooth module interfacing with pic microcontrollers … Line follower robot using microcontroller … Green house humidity sensor circuit with external circuitry As shown in above figure, variable capacitor is used in place of humidity sensor for simulation purpose. Becuase HS1101  simulation model is not available in Proteus. Above circuit is used as a signal conditioning circuit to convert one form of parameter to its other proportional parameter so that it can be easily interfaced with any digital system or microcontroller. It is not possible for any microcontroller to read change in capacitance directly. That why above circuit is used to convert changing capacitance of HS1101 into sqaure wave whose frequency changed according to change in capacitance . I have already post a tutorial on how to measure of square wave using PIC 16F877A microcontroller. I recommend you to go through article before going further in this project. Square wave frequency measurement using PIC16F877A microcontroller

Now you know we can easily measure square wave frequency with microcontroller. But now the question is how we will convert frequency back into relative humidity? There is a proper relationship between humidity and frequency. Go

intelligent control system … Digital Ohmmeter circuit using pic microcontroller … Automatic electronic bell for school using pic microcontroller … Automatic control of street lights … zero crossing detector circuit using pic microcontroller …

through data sheet of HS1101 humidity sensor to know more about HS1101 sensor.

COMPONENTS LIST  Category,Reference,Value,Order Code Resistors,"R1",1732k, Resistors,"R2",549k, http://microcontrollerslab.com/digital-humidity-sensor-using-pic-microcontroller/

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Resistors,"R3",1k, Resistors,"R4",49.9k, Resistors,"R44",10k, Integrated Circuits,"U1",NE555, Integrated Circuits,"U2",PIC16F877A, Miscellaneous,"LCD1",LM016L, Miscellaneous,"SENSOR",humidity sensor HS1101, crystal 20mhz

CIRCUIT DIAGRAM OF HUMIDITY SENSOR Complete circuit diagram of Digital humidity sensor with LCD display:

circuit diagram of digital humidity sensor

Simulation results using pulse generator in proteus:

http://microcontrollerslab.com/digital-humidity-sensor-using-pic-microcontroller/

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As shown in above diagram humidity is shown in percentage. 27% humidity mean air contains 27% water vapors. so you can take control actions according to your requirement. By little bit modification in this project you can also control anything according to change in relative humidity. let me know what is your requirement I will be happy to provide you solution.

CODING: Code is written in mikro c for pic: //***************[email protected]*********** // LCD module connections sbit LCD_D7 at RB2_bit; sbit LCD_D6 at RB3_bit; sbit LCD_D5 at RB4_bit; sbit LCD_D4 at RB5_bit; sbit LCD_EN at RB6_bit; sbit LCD_RS at RB7_bit; sbit LCD_D7_Direction at TRISB2_bit; sbit LCD_D6_Direction at TRISB3_bit; sbit LCD_D5_Direction at TRISB4_bit; sbit LCD_D4_Direction at TRISB5_bit; sbit LCD_EN_Direction at TRISB6_bit; sbit LCD_RS_Direction at TRISB7_bit; // End LCD module connections //******************************frequency meter variables******* int value,freq,humidity; char humid[7]; //************************************************************** void data_converstion(void) { IntToStr(humidity, humid); } void display1(void) { lcd_out(1,1,”Humidity = “); lcd_out(1,13, Ltrim(humid)); Lcd_Chr_Cp(‘%’); Lcd_Chr_Cp(‘ ‘); }


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void interrupt(void) // high portD { if(T1CON.TMR1ON==0) { T1CON.TMR1ON=1; // turn on the timer1 INTCON.INTF = 0; // clear the interrupt flag } else if(T1CON.TMR1ON==1) { T1CON.TMR1ON=0; // turn off the timer1 value=(TMR1H<<8)|(TMR1L); INTCON.INTE = 0; //Enable RB0/INT external Interrupt freq=(5018035/value); humidity = 565 – freq/13; // freq = freq /13.18; //freq = 100 – freq; TMR1H=0; TMR1L=0; INTCON.INTE = 1; //Enable RB0/INT external Interrupt INTCON.INTF = 0; // clear the interrupt flag //freq=0; } } void main() { long count; count=0; TMR1H=0; TMR1L=0; // intialization of timer one prescalar and internal clock INTCON.GIE = 1; //Enable Global Interrupt INTCON.INTE = 1; //Enable RB0/INT external Interrupt OPTION_REG.INTEDG = 0; //Interrupt on rising edge ADC_Init(); Lcd_Init(); // Initialize LCD freq=0; Lcd_Cmd(_LCD_CLEAR); // Clear display lcd_cmd(_LCD_CURSOR_OFF); lcd_out(1,4,”GREEN HOUSE”); lcd_out(2,6,”SYSTEM”); delay_ms(1000); Lcd_Cmd(_LCD_CLEAR); // Clear display http://microcontrollerslab.com/digital-humidity-sensor-using-pic-microcontroller/

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while(1) { data_converstion(); display1(); } }

If you have any problem after reading this article, comment on this post with your problem and if you need complete circuit diagram, simulation and hexa file of this project, comment on this post with your email address. If you feel this article helps you in getting some knowledge kindly don’t forget to share it with your friends on social media. enjoy coding

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About The Author we providing project services to students and industry from last 2 years and working as a freelancer. I also write technical articles related to electrical ,electronics, embedded and power electronics Engineering. Contact me if you need my project services. My email address: [email protected]

29 Comments david shalom SEPTEMBER 13, 2014

i want to know how u calculate the percentage from the frequency thanx Reply

BILAL Malik SEPTEMBER 18, 2014

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I have used the formula which is given in HS1101 humidity sensor data sheet. Formula is used to convert humidity % into frequency and vice versa Reply

ally NOVEMBER 19, 2014

Hi! Bilal I need your help can you help me to make codes for count down timer, temperature and humidity in one micro-controller I tried to do that but there is interference one not working when all reads at the same time please you can email me the hex file for that. Thanks and kind regards Ally Reply http://microcontrollerslab.com/digital-humidity-sensor-using-pic-microcontroller/

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reeza NOVEMBER 20, 2014

hey can u give me the full schematic and source code for this project? Reply

Ally NOVEMBER 22, 2014

Hi! I downloaded the code from Bilal Project for humidity sensor but is not working is not giving me 27% Please can any one give me the formula for calculating frequency in this circuit. and Bilal can you tell me how you get 27%? Thanks Ally Reply

Ally NOVEMBER 22, 2014

Hi Reeza! Sorry I generate codes from different projects and I build it in one micro controller so please if you know to separate codes help me. I need to make Incubator to control temperature,humidity and turning of the eggs automatic so if you any one can help me here the codes I will be thankfully to him. Regards Ally Reply

Abdullah Zohaib Kiani NOVEMBER 29, 2014

Assalamoalikum brother what is the capacitence of hs1101 sensor at 0% humidity and at 100% humidity?? and what is the maximum frequency generated by 555 at 100% humidity?? Reply


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Raj Kumar DECEMBER 19, 2014

Dear Mr. Bilal I would like to have the code (hex file) for humidity controller and temperature controller. Thanks. Raj Reply

ali JANUARY 5, 2015

hi please tell me the program used for coding tnx and give me the hex ofprogram very very tnx for solving my problem Reply

ali JANUARY 10, 2015

hi if any one have the hex of program please send to my mail [email protected] tnx all Reply

Nur Ikhlas FEBRUARY 14, 2015

Hello there Bilal. Can you email me complete circuit diagram, simulation and hex file of this project? please let me know that you email-ed me. Please. this is my email [email protected] Reply

smwal FEBRUARY 15, 2015

hi can i use Lm331 for convert frequency to volt in this project Reply

smwal FEBRUARY 17, 2015

Can you write equation for humidity and frequency because idont understand these please Reply


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akif MARCH 4, 2015

hi if any one have the hex of program please send to my mail [email protected] Reply

moheed MARCH 5, 2015

i need complete code Reply

ion APRIL 21, 2015

Please be so kind and email me the whole project and code I have proteus and i would like to try it Thank you Reply

foxc APRIL 21, 2015

hi Bilal. im working on something like this, where i need to get the frequency from the timer. can you email the whole project because i would like to try this out. thanks brother [email protected] Reply

BILAL Malik APRIL 21, 2015

hi code and circuit diagram is

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already available in post Reply

lam MAY 13, 2015

i need complete code of humidity use key pad control only four key start,use,enter,program .help me Reply

JOBIN GEORGE MAY 21, 2015

Please email me the whole project and code Thank you Reply http://microcontrollerslab.com/digital-humidity-sensor-using-pic-microcontroller/

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JOBIN GEORGE MAY 21, 2015

Please email me the whole project and code Thank you [email protected] Reply

omer JUNE 16, 2015

i need hex.file for humidity sensor Reply

Sarmad JULY 28, 2015

Can you please send me the hex file of this program thanks! Reply

Kalaiyarasan AUGUST 20, 2015

I am going to make water generator from air machine so i need humidity value in air . http://www.instructables.com/id/The-ArduinoWeather-Station-Thermostat/ you can see this link. i think this project value is very high cost, but i need same like as above with cheapest cost can your provide good project with program [email protected] Reply

Bilal Malik AUGUST 21, 2015

you can purchase it from our shop Reply

Romesh JANUARY 16, 2016

Do we need to ground the D0 to D3 pins in the LCD module?if we won’t do that will it work? Reply

BILAL Malik JANUARY 17, 2016

No need

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Reply


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Romesh JANUARY 17, 2016

I tried this out.But it is not displaying anything.Is display connections are correct? Reply

BILAL Malik

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JANUARY 17, 2016

yes it is correct. Connect D+ with 5 volt and D- with ground Reply

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