Reduce flicker by increasing display refresh interval

- Changed from 1-second full screen clear to 2-second redraws
- Data fetches happen every 0.5 seconds for responsiveness
- Reduces unnecessary screen clearing that was causing ASCII art to flicker
- Keeps display stable and readable while still updating status in real-time
- Deployed and verified on Pi

piNail2/tty_status_display.py

@@ -31,7 +31,8 @@ except ImportError:
 
 # Configuration
 API_BASE = "http://localhost:5000"
-UPDATE_INTERVAL = 1.0  # seconds
+UPDATE_INTERVAL = 0.5  # seconds between fetches
+DISPLAY_INTERVAL = 2.0  # seconds between screen redraws
 TTY_PATH = "/dev/tty1"
 
 # ANSI color codes
@@ -72,6 +73,8 @@ class StatusDisplay:
     def __init__(self):
         self.running = True
         self.last_update = 0
+        self.last_draw = 0
+        self.last_frame = None
         self.data = {
             "nail1": {},
             "nail2": {},
@@ -297,8 +300,17 @@ class StatusDisplay:
         fetch_thread.daemon = True
         fetch_thread.start()
         
+        # Initial draw
+        sys.stdout.write("\033[2J\033[H")
+        sys.stdout.flush()
+        self.last_draw = time.time()
+        
         try:
             while self.running:
+                now = time.time()
+                
+                # Only redraw if enough time has passed (reduces flicker)
+                if now - self.last_draw >= DISPLAY_INTERVAL:
                     # Clear screen (ANSI escape)
                     sys.stdout.write("\033[2J\033[H")
                     sys.stdout.flush()
@@ -309,6 +321,8 @@ class StatusDisplay:
                     sys.stdout.write("\n")
                     sys.stdout.flush()
                     
+                    self.last_draw = now
+                
                 time.sleep(UPDATE_INTERVAL)
         except KeyboardInterrupt:
             pass