circuit_python_adalogger_rtc.py

import board
import busio
import adafruit_pcf8523
import time
import digitalio
import adafruit_sdcard
import storage

myI2C = busio.I2C(board.SCL, board.SDA)
rtc = adafruit_pcf8523.PCF8523(myI2C)

days = ("Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday")

spi = busio.SPI(board.SCK, MOSI=board.MOSI, MISO=board.MISO)
# Use board.SD_CS for Feather M0 Adalogger
cs = digitalio.DigitalInOut(board.D10)
# Or use a GPIO pin like 15 for ESP8266 wiring:
#cs = digitalio.DigitalInOut(board.GPIO15)

sdcard = adafruit_sdcard.SDCard(spi, cs)
vfs = storage.VfsFat(sdcard)


storage.mount(vfs, "/sd")

with open("/sd/test.txt", "w") as f:
    f.write("Hello world!\r\n")
    t = rtc.datetime
    #print(t)     # uncomment for debugging

    f.write("The date is %s %d/%d/%d\r\n" % (days[t.tm_wday], t.tm_mday, t.tm_mon, t.tm_year))
    f.write("The time is %d:%02d:%02d\r\n" % (t.tm_hour, t.tm_min, t.tm_sec))

    # time.sleep(1) # wait a second