Sending data from arduino to Nextion display not working

Other Hardware Displays
1

Hello I am trying to send some numbers from my arduino leonardo to my nextion 7 inch Intelligent for a progress bar but it will not work.

int MPH;
void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
}

void loop() {
  MPH = 50;
  Serial.print("j0.val=\""); // Changing the value of box n1
  Serial.print(MPH);
  Serial.print("\"");
  Serial.write(0xff);  // We always have to send this three lines after each command sent to the nextion display.
  Serial.write(0xff);
  Serial.write(0xff);
  Serial.println("END");
}

I have connected the yellow wire RX to the TX on the arduino and the ground cable to the arduino but I have to connect the power cable to an external power source otherwise the screen flickers majorly.

2

Fixed!

3

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