update

RTC/set_with_NTP.py

@@ -0,0 +1,97 @@
+"""
+Script to set the RTC using an NTP server.
+RPI needs to be connected to the internet (WIFI).
+Requires ntplib and pytz:
+sudo pip3 install ntplib pytz --break-system-packages
+
+/usr/bin/python3 /var/www/moduleair_pro_4g/RTC/set_with_NTP.py
+
+"""
+import smbus2
+import time
+from datetime import datetime
+import ntplib
+import pytz  # For timezone handling
+
+# DS3231 I2C address
+DS3231_ADDR = 0x68
+
+# Registers for DS3231
+REG_TIME = 0x00
+
+def bcd_to_dec(bcd):
+    """Convert BCD to decimal."""
+    return (bcd // 16 * 10) + (bcd % 16)
+
+def dec_to_bcd(dec):
+    """Convert decimal to BCD."""
+    return (dec // 10 * 16) + (dec % 10)
+
+def set_time(bus, year, month, day, hour, minute, second):
+    """Set the RTC time."""
+    # Convert the time to BCD format
+    second_bcd = dec_to_bcd(second)
+    minute_bcd = dec_to_bcd(minute)
+    hour_bcd = dec_to_bcd(hour)
+    day_bcd = dec_to_bcd(day)
+    month_bcd = dec_to_bcd(month)
+    year_bcd = dec_to_bcd(year - 2000)  # DS3231 uses year from 2000
+
+    # Write time to DS3231
+    bus.write_i2c_block_data(DS3231_ADDR, REG_TIME, [
+        second_bcd,
+        minute_bcd,
+        hour_bcd,
+        0x01,  # Day of the week (1=Monday, etc.)
+        day_bcd,
+        month_bcd,
+        year_bcd
+    ])
+
+def read_time(bus):
+    """Read the RTC time."""
+    data = bus.read_i2c_block_data(DS3231_ADDR, REG_TIME, 7)
+    second = bcd_to_dec(data[0] & 0x7F)
+    minute = bcd_to_dec(data[1])
+    hour = bcd_to_dec(data[2] & 0x3F)
+    day = bcd_to_dec(data[4])
+    month = bcd_to_dec(data[5])
+    year = bcd_to_dec(data[6]) + 2000
+    return (year, month, day, hour, minute, second)
+
+def get_internet_time():
+    """Get the current time from an NTP server."""
+    ntp_client = ntplib.NTPClient()
+    response = ntp_client.request('pool.ntp.org')
+    utc_time = datetime.utcfromtimestamp(response.tx_time)
+    return utc_time
+
+def main():
+    bus = smbus2.SMBus(1)
+
+    # Get the current time from the RTC
+    year, month, day, hours, minutes, seconds = read_time(bus)
+    rtc_time = datetime(year, month, day, hours, minutes, seconds)
+
+    # Get current UTC time from an NTP server
+    try:
+        internet_utc_time = get_internet_time()
+        print(f"Time from Internet (UTC)     : {internet_utc_time.strftime('%Y-%m-%d %H:%M:%S')}")
+    except Exception as e:
+        print(f"Error retrieving time from the internet: {e}")
+        return
+
+    # Print current RTC time
+    print(f"Actual RTC Time              : {rtc_time.strftime('%Y-%m-%d %H:%M:%S')}")
+
+    # Set the RTC to UTC time
+    set_time(bus, internet_utc_time.year, internet_utc_time.month, internet_utc_time.day, 
+             internet_utc_time.hour, internet_utc_time.minute, internet_utc_time.second)
+
+    # Read and print the new time from RTC
+    year, month, day, hour, minute, second = read_time(bus)
+    rtc_time_new = datetime(year, month, day, hour, minute, second)
+    print(f"New RTC Time (UTC)           : {rtc_time_new.strftime('%Y-%m-%d %H:%M:%S')}")
+
+if __name__ == "__main__":
+    main()