2 DHTS and Multiple HX711 Sensor no display on LCD I2C

Other Hardware Displays
1

Hello guys I need help. I have 2 DHTs and 4 HX711 to be displayed on LCD I2C and somehow LCD doesn't display readings. How can I fix this?


#include <DHT.h>
#include <HX711.h>
#include <Wire.h>
#include <hd44780.h>                       // main hd44780 header
#include <hd44780ioClass/hd44780_I2Cexp.h> // i2c expander i/o class header


#define DHTPin1 2
#define DHTPin2 3
#define DHTTYPE DHT22
#define LOADCELL_DOUT_PIN  5
#define LOADCELL_SCK_PIN  4
#define LOADCELL_DOUT1_PIN 7
#define LOADCELL_SCK1_PIN 6
#define LOADCELL_DOUT2_PIN 9
#define LOADCELL_SCK2_PIN 8
#define LOADCELL_DOUT3_PIN 11
#define LOADCELL_SCK3_PIN 10
HX711 (scale);
HX711 (scale1);
HX711 (scale2);
HX711 (scale3);

hd44780_I2Cexp lcd; // declare lcd object: auto locate & config exapander chip

DHT dht1(DHTPin1, DHTTYPE); // <-- CORRECT - ADD
DHT dht2(DHTPin2, DHTTYPE);
const int LCD_COLS = 20;
const int LCD_ROWS = 4;

// Define variables

float hum = 0.0;
float hum1 = 0.0;// Stores humidity value
float temp = 0.0; // Stores temperature value
float temp1 = 0.0;
void setup()
{
  Serial.begin(9600);
   dht1.begin(); 
   dht2.begin();
   lcd.begin(LCD_COLS, LCD_ROWS);
   scale.begin(LOADCELL_DOUT_PIN, LOADCELL_SCK_PIN);
   scale.begin(LOADCELL_DOUT1_PIN, LOADCELL_SCK1_PIN);
   scale.begin(LOADCELL_DOUT2_PIN, LOADCELL_SCK2_PIN);
   scale.begin(LOADCELL_DOUT3_PIN, LOADCELL_SCK3_PIN);
  scale.set_scale();
  scale.tare();
}
void loop()
{
   delay(4000);  // Delay so sensor can stabilize

   scale.set_scale(-376.0);
   scale1.set_scale(-376.0);
   scale2.set_scale(-376.0);
   scale3.set_scale(-376.0);
   hum = dht1.readHumidity();
   hum1 = dht2.readHumidity();
   delay(2500);
   temp = dht1.readTemperature();
   temp1 = dht2.readTemperature(); 

   delay(2500);
   float grams = scale.get_units(5);
   float grams1 = scale1.get_units(5);
   float grams2 = scale2.get_units(5);
   float grams3 = scale3.get_units(5);
   
   lcd.setCursor(0, 0);
   lcd.print("T:");
   lcd.print(temp);
   lcd.print("C");

   lcd.setCursor(0, 1);
   lcd.print("T:");
   lcd.print(temp1);
   lcd.print("C");
   delay(2500);
   
   lcd.setCursor(9, 0);
   lcd.print("H:");
   lcd.print(hum);
   lcd.print("%");

     lcd.setCursor(9, 1);
   lcd.print("H:");
   lcd.print(hum1);
   lcd.print("%");


   lcd.setCursor(0, 2);
   lcd.print("W:");
   lcd.print(grams);
   lcd.print(" g");

      lcd.setCursor(0, 3);
   lcd.print("W:");
   lcd.print(grams1);
   lcd.print(" g");

   
      lcd.setCursor(9, 2);
   lcd.print("W:");
   lcd.print(grams2);
   lcd.print(" g");

      lcd.setCursor(9, 3);
   lcd.print("W:");
   lcd.print(grams3);
   lcd.print(" g");
 
 
 
}
2

@dave30, your topic has been moved to a more suitable section on the forum.

Do the hd44780 examples work as expected? If not, disconnect everything except for the display and try again.

3

I tried 2 dhts and 1 hx711 and it works fine as it displays to my lcd. When i code 4 hx711s and 2 dhts, all the readings disappeared from my lcd but the codes have no errors.

4

In your Multiple DHT22 Sensors with LCD I2C display [SOLVED] topic, you mentioned that the problem was due to power; any chance that that is happening again?

How do you power everything?

5

I powered these sensors and LCD by 5v arduino supply. It is because i put 2nd DHT too far from my breadboard pins last topic.

6

But in this case, i put their pins close so i can power them but still the readings disappeared.

7

What exactly is a "5v arduino supply"?

8

5v pin on arduino

9

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