OLED not updating display

Question

I'm trying to connect a GPS unit (GY-GPS6MV2) and an OLED screen as in the diagram below (green connector is GPS; VCC, RX, TX, GND left to right):

enter image description here

Here's the code I've come up with:

#include <Wire.h>
#include <Adafruit_SH1106.h>
#include <TinyGPS++.h>
#include <SoftwareSerial.h>
#define OLED_RESET 4
Adafruit_SH1106 display(OLED_RESET);
static const int RXPin = 5, TXPin = 3;
static const uint32_t GPSBaud = 9600;
float vkph;
float vmps;
TinyGPSPlus gps;
SoftwareSerial ss(RXPin, TXPin);
void setup(){
 Serial.begin(9600);
 ss.begin(GPSBaud);
 display.begin(SH1106_SWITCHCAPVCC, 0x3C);
 display.display();
 delay(2000);
 display.clearDisplay();
}
void loop(){
 while (ss.available() > 0){
 gps.encode(ss.read());
 vkph = gps.speed.kmph();
 vmps = gps.speed.mps();
 if (gps.location.isUpdated()){
 Serial.print("Position: "); 
 Serial.print(gps.location.lat(), 6);
 Serial.print(" : "); 
 Serial.println(gps.location.lng(), 6);
 Serial.print("Speed: ");
 Serial.print(vmps); 
 Serial.print(" m/s");
 Serial.print(", ");
 Serial.print(vkph);
 Serial.println( " km/hr"); 
 
 display.clearDisplay();
 display.setTextSize(2);
 display.setTextColor(WHITE);
 display.setCursor(0,0);
 display.println("Hello"); // Changing this to display.println(vmps);
 display.setTextSize(2);
 display.setTextColor(WHITE);
 display.println("World"); // Changing this to display.println(vkph);
 display.display();
 delay(1000); 
 }
 }
}

The GPS outputs to the serial monitor fine, and the screen displays "Hello \n World" as expected. But when I make the changes indicated in the comments to the display part of the code, the display just shows its splash screen, flashing when the GPS updates.

How can I get the display to show the speeds in m/s and km/hr?

Answer 1

Maybe you need to add delay() in your code,I am not sure.

display.clearDisplay();
 display.setTextSize(2);
 display.setTextColor(WHITE);
 display.setCursor(0,0);
 display.println("Hello"); // Changing this to display.println(vmps);
 display.setTextSize(2);
 display.setTextColor(WHITE);
 display.println("World"); // Changing this to display.println(vkph);
 display.display();
 delay(1000);

• Jim421616: Why, and where?
• Memba: Because OLED doesn't have a time to keep showing.
• chrisl: Is this an answer or a question? Also please elaborate more, so that the answer is really helpful
• Jim421616: I tried this, even before you posted the edit. Same problem, only now it takes 1000 milliseconds to flash the splash screen.
• chrisl: Have you also added the delay after the GPS display code?