Fix screen garbage again

esp32-lora/main.py

@@ -21,10 +21,13 @@ def sensor_task():
         raw = read_light()
         percent = int((raw / 4095) * 100)
 
-        screen.clear()
-        screen.display("Light Sensor", 15, 0)
-        screen.display("Raw: {}".format(raw), 15, 20)
-        screen.display("Level: {}%".format(percent), 15, 40)
+        lines = [
+            "Light Sensor",
+            f"Raw: {raw}",
+            f"Level: {percent}%"
+        ]
+
+        screen.display_lines(lines)
 
         time.sleep(1)
 

esp32-lora/screen.py

@@ -28,5 +28,12 @@ class Screen:
         self.oled.show()
 
     def display(self, message, col=0, row=0):
+        self.clear()
         self.oled.text(message, col, row)
         self.oled.show()
+
+    def display_lines(self, lines):
+        self.clear()
+        for i, line in enumerate(lines):
+            self.oled.text(line, 15, i * 20)
+        self.oled.show()