From 800d003761abd35a418134a28897633f07eeb695 Mon Sep 17 00:00:00 2001
From: Kumi <git@kumi.email>
Date: Tue, 19 Mar 2024 20:21:47 +0100
Subject: [PATCH] feat: add buzzer feedback for RFID reads

Introduced an optional buzzer parameter to `read_task` and `do_read`
functions to provide audible feedback when an RFID/NFC card is
successfully read. This enhancement is aimed at improving user
interaction by providing immediate auditory confirmation of a successful
card scan. The buzzer is triggered for a short duration upon successful
card detection. This feature offers a more intuitive experience,
especially in environments where visual confirmation might be
challenging to notice.

A GPIO pin is configured as output for the buzzer control, ensuring
minimal impact on the code's structure and maintaining backward
compatibility by keeping the buzzer parameter optional.
---
 main.py | 17 +++++++++++++----
 1 file changed, 13 insertions(+), 4 deletions(-)

diff --git a/main.py b/main.py
index 6ff2c23..395ce7e 100644
--- a/main.py
+++ b/main.py
@@ -45,19 +45,19 @@ async def peripheral_task():
         except BaseException as e:
             print("Exception in peripheral_task:", e)
 
-async def read_task(rdr):
+async def read_task(rdr, buzzer=None):
     # Start listening for a card
     time.sleep_ms(1000)
     print("Waiting for RFID/NFC card...")
 
     while True:
         try:
-            do_read(rdr)
+            do_read(rdr, buzzer)
         except Exception as e:
             print("Exception in read_task:", e)
         await asyncio.sleep_ms(100)
 
-def do_read(rdr):
+def do_read(rdr, buzzer=None):
     gc.collect()
     last_uid = None
     while True:
@@ -74,6 +74,12 @@ def do_read(rdr):
             struid = "".join(['{:0>{w}}'.format(hex(i)[2:], w=2) for i in uid])
             print("Found card with UID:", struid)
             rfid_characteristic.write(uid)
+
+            if buzzer:
+                buzzer.value(1)
+                time.sleep_ms(300)
+                buzzer.value(0)
+
             last_uid = uid
         except Exception as e:
             print("Something failed:", e)
@@ -101,9 +107,12 @@ async def main():
 
         gc.collect()
 
+        buzzer = Pin(27, Pin.OUT)
+        buzzer.value(0)
+
         await asyncio.gather(
             peripheral_task(),
-            read_task(pn532)
+            read_task(pn532, buzzer)
         )
 
     except KeyboardInterrupt: