esp32 S3 DevKit C1 case

utils.py

@@ -28,6 +28,22 @@ def ask_float(prompt: str) -> float:
         except ValueError:
             print("Please enter a valid number.")
 
+def ask_optional_float(prompt: str) -> float | None:
+    """Prompt user for an optional positive float."""
+    while True:
+        raw = input(f"{prompt} [Enter = keep default]: ").strip().replace(",", ".")
+        if not raw:
+            return None
+        try:
+            value = float(raw)
+        except ValueError:
+            print("Please enter a number.")
+            continue
+        if value <= 0:
+            print("Value must be greater than 0.")
+            continue
+        return value
+
 def ask_yes_no(prompt: str) -> bool:
     """Prompt the user for a yes/no answer."""
     while True: