Datasheet

Usage

To demonstrate the usage of the PCF8523 module you can connect to your board's serial REPL to see the output while

saving our example sketch to main.py

Next connect to the board's serial REPL so you are at the CircuitPython >>> prompt.

Then save this script to main.py (back up or remove whatever was there before)

Setting the time

The first time you run the program, you'll need to set the time

import busio

import adafruit_pcf8523

import time

import board

myI2C = busio.I2C(board.SCL, board.SDA)

rtc = adafruit_pcf8523.PCF8523(myI2C)

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

if False: # change to True if you want to write the time!

# year, mon, date, hour, min, sec, wday, yday, isdst

t = time.struct_time((2017, 10, 29, 15, 14, 15, 0, -1, -1))

# you must set year, mon, date, hour, min, sec and weekday

# yearday is not supported, isdst can be set but we don't do anything with it at this time

print("Setting time to:", t) # uncomment for debugging

rtc.datetime = t

print()

while True:

t = rtc.datetime

#print(t) # uncomment for debugging

print("The date is %s %d/%d/%d" % (days[t.tm_wday], t.tm_mday, t.tm_mon, t.tm_year))

print("The time is %d:%02d:%02d" % (t.tm_hour, t.tm_min, t.tm_sec))

time.sleep(1) # wait a second