rtc udpate

RTC/read.py

@@ -20,6 +20,8 @@ def bcd_to_dec(bcd):
     return (bcd // 16 * 10) + (bcd % 16)
 
 def read_time(bus):
+    """Try to read and decode time from the RTC module (DS3231)."""
+    try:
         data = bus.read_i2c_block_data(DS3231_ADDR, REG_TIME, 7)
         seconds = bcd_to_dec(data[0] & 0x7F)
         minutes = bcd_to_dec(data[1])
@@ -27,13 +29,20 @@ def read_time(bus):
         day = bcd_to_dec(data[4])
         month = bcd_to_dec(data[5])
         year = bcd_to_dec(data[6]) + 2000
-    return (year, month, day, hours, minutes, seconds)
+        return datetime(year, month, day, hours, minutes, seconds)
+    except OSError:
+        return None  # RTC module not connected
 
 def main():
     # Read RTC time
     bus = smbus2.SMBus(1)
-    year, month, day, hours, minutes, seconds = read_time(bus)
-    rtc_time = datetime(year, month, day, hours, minutes, seconds)
+    # Try to read RTC time
+    rtc_time = read_time(bus)
+    # If RTC is not connected, set default message
+    if rtc_time is None:
+        rtc_time_str = "not connected"
+    else:
+        rtc_time_str = rtc_time.strftime('%Y-%m-%d %H:%M:%S')
 
      # Get current system time
     system_time = datetime.now() #local
@@ -46,7 +55,7 @@ def main():
 
      # Create JSON output
     time_data = {
-        "rtc_module_time": rtc_time.strftime('%Y-%m-%d %H:%M:%S'),
+        "rtc_module_time":rtc_time_str,
         "system_local_time": system_time.strftime('%Y-%m-%d %H:%M:%S'),
         "system_utc_time": utc_time.strftime('%Y-%m-%d %H:%M:%S')
     }