My lcd display not showing anything

[yabedibedoo]

im doing an energy meter that i saw from the internet and i follow the right step.i'm clueless as to how does the lcd display doesnt display.Please share some insights

the code

#include <LiquidCrystal_I2C.h>
// Set the LCD address to 0x27 for a 16 chars and 2 line display
LiquidCrystal_I2C lcd(0x27, 16, 2);
#define BLYNK_PRINT Serial
#include "EmonLib.h"
#include <WiFi.h>
#include <WiFiClient.h>
#include <BlynkSimpleEsp32.h>

EnergyMonitor emon;

#define vCalibration 83.3
#define currCalibration 0.50

BlynkTimer timer;

char auth[] = "apYc_VS8FMFL6SWw5TMM4HXZRWN4ee4p";
char ssid[] = "Omar";
char pass[] = "password";

float kWh = 0;
unsigned long lastmillis = millis();

void myTimerEvent()
{
  emon.calcVI(20, 2000);
  kWh = kWh + emon.apparentPower * (millis() - lastmillis) / 3600000000.0;
  yield();
  Serial.print("Vrms: ");
  Serial.print(emon.Vrms, 2);
  Serial.print("V");

  Serial.print("\tIrms: ");
  Serial.print(emon.Irms, 4);
  Serial.print("A");

  Serial.print("\tPower: ");
  Serial.print(emon.apparentPower, 4);
  Serial.print("W");

  Serial.print("\tkWh: ");
  Serial.print(kWh, 5);
  Serial.println("kWh");

  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Vrms:");
  lcd.print(emon.Vrms, 2);
  lcd.print("V");
  lcd.setCursor(0, 1);
  lcd.print("Irms:");
  lcd.print(emon.Irms, 4);
  lcd.print("A");
  delay(2500);

  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Power:");
  lcd.print(emon.apparentPower, 4);
  lcd.print("W");
  lcd.setCursor(0, 1);
  lcd.print("kWh:");
  lcd.print(kWh, 4);
  lcd.print("W");
  delay(2500);

  lastmillis = millis();

  Blynk.virtualWrite(V0, emon.Vrms);
  Blynk.virtualWrite(V13, emon.Irms);
  Blynk.virtualWrite(V2, emon.apparentPower);
  Blynk.virtualWrite(V3, kWh);
}

void setup()
{
  Serial.begin(9600);
  lcd.begin();
  lcd.backlight();
  Blynk.begin(auth, ssid, pass);
  emon.voltage(35, vCalibration, 1.7);
  emon.current(34, currCalibration);
  timer.setInterval(5000L, myTimerEvent);
  lcd.setCursor(3, 0);
  lcd.print("IoT Energy");
  lcd.setCursor(5, 1);
  lcd.print("Meter");
  delay(3000);
  lcd.clear();
}

void loop()
{
  Blynk.run();
  timer.run();
}

[sterretje]

Start by only using the lcd and the microcontroller board. Get that working first.

Your topic has been moved to a more suitable location on the forum. Installation and Troubleshooting is not for problems with (nor for advice on) your project See About the Installation & Troubleshooting category.

[yabedibedoo]

i think its from my code because on other code that involves an lcd works but this doesnt

[anon56112670]

Do you have a simple "hello world" sketch for the LCD?
Does that work?

[FernandoGarcia]

This wiring of LCD seems wrong for ESP32.

With this library changing lcd.begin to lcd.init your code can print on LCD with this wiring.

Here the pinout for ESP32

[yabedibedoo]

when i change to lcd.init

[FernandoGarcia]

Install the library from my link or try your current code after fix the wiring.

[camsysca]

@yabedibedoo Diagram illegible. Is the red trace connected to Vin, or 5V, on the Arduino and GND/0V on the LCD? It's impossible to tell.

[yabedibedoo]

still the same error

[FernandoGarcia]

Post good pictures showing how it's wired and show us your current code.

Also tell us if it can work with some example from library.

[yabedibedoo]

#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 16, 2);
#include "EmonLib.h"
#include <EEPROM.h>
#define BLYNK_PRINT Serial
#include <WiFi.h>
#include <WiFiClient.h>
#include <BlynkSimpleEsp32.h>
 
EnergyMonitor emon;
#define vCalibration 83.3
#define currCalibration 0.50
 
BlynkTimer timer;
char auth[] = "nrexz-lNuB963age87Dlm7GvtmGure2y";
char ssid[] = "prateeksingh";
char pass[] = "kumar@12345";
 
float kWh = 0;
unsigned long lastmillis = millis();
 
void myTimerEvent()
{
  emon.calcVI(20, 2000);
  kWh = kWh + emon.apparentPower * (millis() - lastmillis) / 3600000000.0;
  yield();
  Serial.print("Vrms: ");
  Serial.print(emon.Vrms, 2);
  Serial.print("V");
  EEPROM.update(0, emon.Vrms);
  delay(100);
 
  Serial.print("\tIrms: ");
  Serial.print(emon.Irms, 4);
  Serial.print("A");
  EEPROM.update(1, emon.Irms);
  delay(100);
 
  Serial.print("\tPower: ");
  Serial.print(emon.apparentPower, 4);
  Serial.print("W");
  EEPROM.update(2, emon.apparentPower);
  delay(100);
 
  Serial.print("\tkWh: ");
  Serial.print(kWh, 5);
  Serial.println("kWh");
  EEPROM.update(3, kWh);
 
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Vrms:");
  lcd.print(emon.Vrms, 2);
  lcd.print("V");
  lcd.setCursor(0, 1);
  lcd.print("Irms:");
  lcd.print(emon.Irms, 4);
  lcd.print("A");
  lcd.setCursor(0, 2);
  lcd.print("Power:");
  lcd.print(emon.apparentPower, 4);
  lcd.print("W");
  lcd.setCursor(0, 3);
  lcd.print("kWh:");
  lcd.print(kWh, 4);
  lcd.print("W");
 
  lastmillis = millis();
 
  Blynk.virtualWrite(V0, emon.Vrms);
  Blynk.virtualWrite(V1, emon.Irms);
  Blynk.virtualWrite(V2, emon.apparentPower);
  Blynk.virtualWrite(V3, kWh);
}
 
void setup()
{
  Serial.begin(115200);
  Blynk.begin(auth, ssid, pass);
  lcd.begin();
  lcd.backlight();
  eepromState();
  emon.voltage(35, vCalibration, 1.7);  // Voltage: input pin, calibration, phase_shift
  emon.current(34, currCalibration);    // Current: input pin, calibration.
 
  timer.setInterval(5000L, myTimerEvent);
  lcd.setCursor(3, 0);
  lcd.print("IoT Energy");
  lcd.setCursor(5, 1);
  lcd.print("Meter");
  delay(3000);
  lcd.clear();
 
 
  void loop()
  {
    Blynk.run();
    timer.run();
  }

[FernandoGarcia]

@FernandoGarcia

Also tell us if it can work with some example from library.