Library problem or code problem

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1

im having a problem with my code i dont know how to fix it because im still an amateur at arduino coding and i have been tasked in making a code using a dht library and a liquid crystal library and mix them up so that a measurement shows on the lcd screen but i have been on this for over a week and i cant seem to find the error can someone pls help me

this is my last code i made

#include <LiquidCrystal.h>
#include <DHT.h>
#include <DHT_U.h>
#include <Adafruit_Sensor.h>

LiquidCrystal.h lcd(0x3F, 16, 2);

DHT dht;
const int DHT11_PIN = 4;

void setup()
{
lcd.begin();
lcd.backlight();
}

void loop()
{
dht.read11(DHT_PIN);
lcd.setCursor(0, 0);
lcd.print("Temp: ");
lcd.print(dht.temperature, 0);
lcd.print(char(223));
lcd.print("C");
lcd.setCursor(0, 1);
lcd.print("Humidity: ");
lcd.print(dht.humidity, 0); lcd.print(" %");
delay(200);
}

using a liquid crystal by 2006-2008 Hans-Christoph Steiner
a dht by adafruit

and this was my first one using the same libraries

#include <LiquidCrystal.h>
#include <DHT.h>
#include <DHT_U.h>
#include <Adafruit_Sensor.h>
DHT dht11(6);

const int rs = 12, en = 11, d4 = 5, d5 = 4, d6 = 3, d7 = 2;
LiquidCrystal lcd(rs, en, d4, d5, d6, d7);

char message[] = dht11.readTemperatureHumidity;
int messageLength;
int scrollPosition = 0;

void setup() {
lcd.begin(16, 2);
lcd.print( dht11.readTemperatureHumidity);
messageLength = strlen(message);
delay(1000);

Serial.begin(9600);

}

void loop() {

lcd.clear();

for (int i = 0; i < 16; i++) {
int charIndex = scrollPosition + i;
if (charIndex >= messageLength) {
charIndex -= messageLength;
}
lcd.setCursor(i, 0);
lcd.print(message[charIndex]);
}

scrollPosition++;
if (scrollPosition >= messageLength) {
scrollPosition = 0;
}

delay(300);

  int temperature = 0;
int humidity = 0;

int result = dht11.readTemperatureHumidity(temperature, humidity);

if (result == 0) {
    Serial.print("Temperature: ");
    Serial.print(temperature);
    Serial.print(" °C\tHumidity: ");
    Serial.print(humidity);
    Serial.println(" %");
} else {
    Serial.println(DHT11::getErrorString(result));
}

}

i would really appreciate the help

2

to start with...

3

As per forum requirements, please aways enclose the code lines in a "code" block, to make it more readable and allow us to get an easier copy to test with.

So please Edit your first post, select each the code blocks and press the editor "<CODE/>" top button (repeat for each block), then save. Thanks.

1 Like
4 
#include <LiquidCrystal.h>
#include <DHT.h>
#include <DHT_U.h>
#include <Adafruit_Sensor.h>

LiquidCrystal.h lcd(0x3F, 16, 2);

DHT dht;
const int DHT11_PIN = 4;

void setup() {
  lcd.begin();
  lcd.backlight();
}

void loop() {
  dht.read11(DHT_PIN);
  lcd.setCursor(0, 0);
  lcd.print("Temp: ");
  lcd.print(dht.temperature, 0);
  lcd.print(char(223));
  lcd.print("C");
  lcd.setCursor(0, 1);
  lcd.print("Humidity: ");
  lcd.print(dht.humidity, 0); lcd.print(" %");
  delay(200);
}

==================================================

#include <LiquidCrystal.h>
#include <DHT.h>
#include <DHT_U.h>
#include <Adafruit_Sensor.h>
DHT dht11(6);

const int rs = 12, en = 11, d4 = 5, d5 = 4, d6 = 3, d7 = 2;
LiquidCrystal lcd(rs, en, d4, d5, d6, d7);

char message[] = dht11.readTemperatureHumidity;
int messageLength;
int scrollPosition = 0;

void setup() {
  lcd.begin(16, 2);
  lcd.print( dht11.readTemperatureHumidity);
  messageLength = strlen(message);
  delay(1000);
  Serial.begin(9600);
}

void loop() {
  lcd.clear();
  for (int i = 0; i < 16; i++) {
    int charIndex = scrollPosition + i;
    if (charIndex >= messageLength) {
      charIndex -= messageLength;
    }
    lcd.setCursor(i, 0);
    lcd.print(message[charIndex]);
  }
  scrollPosition++;
  if (scrollPosition >= messageLength) {
    scrollPosition = 0;
  }
  delay(300);
  int temperature = 0;
  int humidity = 0;
  int result = dht11.readTemperatureHumidity(temperature, humidity);
  if (result == 0) {
    Serial.print("Temperature: ");
    Serial.print(temperature);
    Serial.print(" °C\tHumidity: ");
    Serial.print(humidity);
    Serial.println(" %");
  } else {
    Serial.println(DHT11::getErrorString(result));
  }
}
5

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