refactor: optimize sleep durations for RFID reading

Reduced initial sleep time before card detection and adjusted sleep
intervals within read loops to enhance responsiveness and resource
efficiency in RFID/NFC reading routines. This adjustment aims to
minimize unnecessary delays, improving the user experience by making
card detection more prompt without compromising system stability. Moved
consistent sleeping to a `finally` block in `do_read` to ensure regular
timing intervals, regardless of read success or exceptions, contributing
to a more predictable and reliable operation.

main.py

@@ -47,7 +47,6 @@ async def peripheral_task():
 
 async def read_task(rdr, buzzer=None):
     # Start listening for a card
-    time.sleep_ms(1000)
     print("Waiting for RFID/NFC card...")
 
     while True:
@@ -61,7 +60,6 @@ def do_read(rdr, buzzer=None):
     gc.collect()
     last_uid = None
     while True:
-        time.sleep_ms(100)
         try:
             uid = rdr.read_passive_target(timeout=0.2)
             if last_uid == uid:
@@ -81,10 +79,14 @@ def do_read(rdr, buzzer=None):
                 buzzer.value(0)
 
             last_uid = uid
+
         except Exception as e:
             print("Something failed:", e)
             pass
 
+        finally:
+            time.sleep_ms(100)
+
 async def main():
     try:
         i2c = machine.I2C(0, scl=machine.Pin(1), sda=machine.Pin(0))
@@ -103,7 +105,7 @@ async def main():
         print("Found PN532 with firmware version: {0}.{1}".format(ver, rev))
         pn532.SAM_configuration()
 
-        time.sleep_ms(1000)
+        time.sleep_ms(100)
 
         gc.collect()