display works

platformio.ini

@@ -17,3 +17,4 @@ monitor_speed = 115200
 lib_deps = 
 	knolleary/PubSubClient@^2.8
 	bblanchon/ArduinoJson@^6.21.3
+	marcoschwartz/LiquidCrystal_I2C@^1.1.4

src/display.cpp

@@ -0,0 +1,30 @@
+#include <Arduino.h>
+#include <LiquidCrystal_I2C.h>
+#include <ESP8266WiFi.h>
+#include <PubSubClient.h>
+
+const char *ssid = "PET Aflytningsvogn #43";
+const char *password = "zwr33htm";
+
+const char *mqtt_server = "192.168.24.215";
+
+// set the LCD number of columns and rows
+int lcdColumns = 16;
+int lcdRows = 2;
+
+// set LCD address, number of columns and rows
+LiquidCrystal_I2C lcd(0x3f, lcdColumns, lcdRows);  
+
+void setup(){  
+  lcd.init();
+  lcd.backlight();
+}
+
+void loop(){
+  // set cursor to first column, first row
+  lcd.setCursor(0, 0);
+  // print message
+  lcd.print("Piss off, ghosts!");
+  // clears the display to print new message
+  lcd.clear();
+}