Temperature and Humidity Display using Arduino

This is a working device i made which displays temperature or humidity respectively by pressing a push button switch. If the switch is pressed it displays humidity otherwise it displays temperature.

This device incorporates seven segment displays as output for the value of temperature and humidity to be displayed.

The two seven segment displays works on the principle of multiplexing which saves a lot of I/O pins on Arduino and a lot of coding time.

There is also a switch to choose if you want to view temperature or humidity according to your choice.

Step 1: Items required

The items required are :-

1. 2 X 7 Segment Displays (COMMON ANODE)

2. 1 X PUSH BUTTON SWITCH

3. 1 X DHT11 Humidity And Temperature Sensor

4. 1 X ARDUINO (UNO,Mega,Nano etc.)

5.1 X Perfboard/BreadBoard

Step 2: Circuit Diagram

Step 3: CODE

Upload the code given to your Arduino and your device should work.

If any problems persists please message me or comment below.

#include <dht.h>

dht DHT;

int choice=0;

int dhtpin = A0;

int pin1 = 2;

int pin2 = 3;                                    //                            --6--

int pin3 = 4;                                    //                         5 |     | 7

int pin4 = 5;                                    //                           |--4--|

int pin5 = 6;                                    //                         1 |     | 3

int pin6 = 7;                                    //                            --2--

int pin7 = 8;

int gnd1 = 9;                                  // for temperature

int gnd2 = 10;                                 // for temperature 

const int pixellength = 100;                                

int pinstringA[11] = {                                     

  LOW,HIGH,LOW,LOW,HIGH,LOW,LOW,LOW,LOW,LOW};         

int pinstringB[11] = {                                      

  LOW,LOW,LOW,LOW,LOW,HIGH,HIGH,LOW,LOW,LOW};

int pinstringC[11] = {

  LOW,LOW,HIGH,LOW,LOW,LOW,LOW,LOW,LOW,LOW};

int pinstringD[11] = {

  LOW,HIGH,LOW,LOW,HIGH,LOW,LOW,HIGH,LOW,LOW};

int pinstringE[11] = {

  LOW,HIGH,LOW,HIGH,HIGH,HIGH,LOW,HIGH,LOW,HIGH};

int pinstringF[11] = {                                       

  LOW,HIGH,HIGH,HIGH,LOW,LOW,LOW,HIGH,LOW,LOW};            

int pinstringG[11] = {

  HIGH,HIGH,LOW,LOW,LOW,LOW,LOW,LOW,LOW,LOW};

void setup(){

  for(byte i=2; i<12; i++){                                  

    pinMode(i,OUTPUT);

  }

  pinMode(11,INPUT);

  Serial.begin(9600);

}

void loop(){

  DHT.read11(dhtpin);     //reading values

  choice=digitalRead(11);

  

  if(choice==1){

  int y=DHT.humidity;

  byte tensh;

  byte onesh;

  tensh = y / 10;

  onesh = y % 10;  

  

  for(int j = 0; j < pixellength; j++){                     

    digitalWrite(gnd1,HIGH);

    digitalWrite(gnd2,LOW); 

    digitalWrite(pin1, pinstringE[tensh]);

    digitalWrite(pin2, pinstringD[tensh]);    

    digitalWrite(pin3, pinstringC[tensh]);

    digitalWrite(pin4, pinstringB[tensh]);

    digitalWrite(pin5, pinstringA[tensh]);

    digitalWrite(pin6, pinstringF[tensh]);                    

    digitalWrite(pin7, pinstringG[tensh]); 

    delay(10);                                         

     PORTD = PORTD & B00000011;                       

    digitalWrite(gnd1,LOW);

    digitalWrite(gnd2,HIGH);

    digitalWrite(pin1, pinstringE[onesh]);

    digitalWrite(pin2, pinstringD[onesh]);    

    digitalWrite(pin3, pinstringC[onesh]);

    digitalWrite(pin4, pinstringB[onesh]);

    digitalWrite(pin5, pinstringA[onesh]);

    digitalWrite(pin6, pinstringF[onesh]);    

    digitalWrite(pin7, pinstringG[onesh]);

    delay(10);                                

     PORTD = PORTD & B00000011;              

  }

  }

  

  else{

    int x=DHT.temperature;

     Serial.println(x); 

  byte tens;

  byte ones;

  tens = x / 10;

  ones = x % 10;  

    

  for(int j = 0; j < pixellength; j++)

  {

    digitalWrite(gnd1,HIGH);

    digitalWrite(gnd2,LOW);

    

    digitalWrite(pin1, pinstringE[tens]);

    digitalWrite(pin2, pinstringD[tens]);    

    digitalWrite(pin3, pinstringC[tens]);

    digitalWrite(pin4, pinstringB[tens]);

    digitalWrite(pin5, pinstringA[tens]);

    digitalWrite(pin6, pinstringF[tens]);                    

    digitalWrite(pin7, pinstringG[tens]); 

    delay(10);

    PORTD = PORTD & B00000011;

    digitalWrite(gnd1,LOW);

    digitalWrite(gnd2,HIGH);

    digitalWrite(pin1, pinstringE[ones]);

    digitalWrite(pin2, pinstringD[ones]);    

    digitalWrite(pin3, pinstringC[ones]);

    digitalWrite(pin4, pinstringB[ones]);

    digitalWrite(pin5, pinstringA[ones]);

    digitalWrite(pin6, pinstringF[ones]);    

    digitalWrite(pin7, pinstringG[ones]);

    delay(10);

    PORTD = PORTD & B00000011;

  }  

}

  }

Final Step: Finished

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ADMINENGR ABIOLA JOHNSON OPEYEMI

abiola.johnson@outlook.com

theyoungengineerzz@gmail.com

WhatsApp +234-8079593532

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