Good day! I'm currently working on a device with Arduino UNO, NFC/RFID Module v3, esp8266 and LCD with i2c adapter. The process is TAP card, read card data then send via wifi.

Here's the scenario, the code is working fine without the LCD library. I have used the LEDs as my indicators whether my data has been sent or not. Then I decided to use LCD as my visual indicator.I put the library of the LCD i2c and its corresponding code in my previous sketch (which is perfectly working). Successfully compiled and uploaded the sketch. Although it appears that the data has been successfully sent, but the data were not received by the web.

I have tried removing the code of the LCD i2c again, then the device is really working. Successfully sent the data and all.

Here's the link LCD library that Im using: https://github.com/fdebrabander/Arduino-LiquidCrystal-I2C-library/tree/master/examples

What are the possible ways to correct this problem? Thank you very much.

Here's some part of my code: https://i.stack.imgur.com/XVkyx.jpg

Everytime I add the code for LCD like this one:


,data has been sent successfully but was not received. Removed that part again and data was received.

  • 1
    Show us your code with the LCD – chrisl May 23 '18 at 9:11
  • Are you using the Arduino Uno or the Arduino Uno WiFi? – sa_leinad May 23 '18 at 11:18
  • Have you tested the LCD by itself? – Craig May 23 '18 at 18:52
  • I used Arduino UNO and esp8266 wifi module.Then LCD has been tested and its working fine. Here's my code for LCD: #include <Wire.h> #include <LiquidCrystal_I2C.h> LiquidCrystal_I2C lcd(0x3F,16,2); then in the void setup : lcd.init(); lcd.backlight(); lcd.setCursor(4,0); lcd.print("RELOADER"); lcd.setCursor(0,1); lcd.print(" Beach Festival"); } – Jovanie Española May 24 '18 at 0:48
  • I have added my code in LCD. – Jovanie Española May 24 '18 at 1:04

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