83 lines
2.1 KiB
Python
83 lines
2.1 KiB
Python
#!/usr/bin/env python3
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"""Alarm example for PyPCF8523 RTC driver.
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This example demonstrates how to use the alarm functionality:
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- Setting an alarm
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- Checking alarm status
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- Clearing an alarm
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Hardware setup:
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- Connect PCF8523 to Raspberry Pi I2C bus 1
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- Optionally connect INT pin to a GPIO for interrupt handling
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"""
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import time
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from pypcf8523 import PCF8523
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def main():
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print("PCF8523 Alarm Example")
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print("=" * 50)
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# Initialize the RTC
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rtc = PCF8523(i2c_bus=1)
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# Get current time
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current = rtc.datetime
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print(f"Current time: {current.tm_hour:02d}:{current.tm_min:02d}:{current.tm_sec:02d}")
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# Set an alarm for 2 minutes from now
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alarm_minute = (current.tm_min + 2) % 60
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alarm_hour = current.tm_hour
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if alarm_minute < current.tm_min: # Handle hour rollover
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alarm_hour = (alarm_hour + 1) % 24
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print(f"Setting alarm for: {alarm_hour:02d}:{alarm_minute:02d}")
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rtc.set_alarm(minute=alarm_minute, hour=alarm_hour)
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# Enable the alarm interrupt
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rtc.alarm_interrupt = True
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print("Alarm interrupt enabled")
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# Clear any existing alarm status
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rtc.alarm_status = False
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print("\nWaiting for alarm... (Press Ctrl+C to stop)")
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print("-" * 50)
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try:
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while True:
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# Read current time
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current = rtc.datetime
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time_str = f"{current.tm_hour:02d}:{current.tm_min:02d}:{current.tm_sec:02d}"
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# Check if alarm triggered
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if rtc.alarm_status:
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print(f"\n🔔 ALARM! Triggered at {time_str}")
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# Clear the alarm
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rtc.alarm_status = False
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print("Alarm cleared")
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# Optionally disable the alarm
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# rtc.clear_alarm()
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# print("Alarm disabled")
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break
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else:
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print(f"Current time: {time_str} - Waiting for alarm...", end="\r")
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time.sleep(1.0)
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except KeyboardInterrupt:
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print("\n\nExample stopped by user")
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finally:
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# Clean up
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rtc.clear_alarm()
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rtc.close()
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print("Alarm cleared and RTC connection closed")
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if __name__ == "__main__":
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main()
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