# VCC-GND STM32F407VET6 on SPI3 >>> from machine import I2C, Pin >>> i2c = I2C(3) # SCL=A8, SDA=C9 >>> i2c.scan() [80, 104] # 80 == 0x50 == AT24C32N EEPROM # 104 == 0x68 == DS1307 >>> import ds1307 >>> ds = ds1307.DS1307(i2c) ds.datetime() ds.datetime(now) # initial datetime value, oscillator disabled >>> ds.datetime() (2000, 1, 1, 0, 0, 0, 0, 0) # read datetime after 1 second (no change) >>> ds.datetime() (2000, 1, 1, 0, 0, 0, 0, 0) # enable oscillator >>> ds.halt(False) # read datetime after 1 second >>> ds.datetime() (2000, 1, 1, 0, 0, 0, 1, 0) # read datetime after 1 more second >>> ds.datetime() (2000, 1, 1, 0, 0, 0, 2, 0) # read datetime after 1 more second >>> ds.datetime() (2000, 1, 1, 0, 0, 0, 3, 0) # set the datetime 24th March 2018 at 1:45:21 PM >>> now = (2018, 3, 24, 6, 13, 45, 21, 0) >>> ds.datetime(now) # read datetime after 1 second >>> ds.datetime() (2018, 3, 24, 6, 13, 45, 22, 0) # read datetime after 1 second >>> ds.datetime() (2018, 3, 24, 6, 13, 45, 23, 0) # disable oscillator >>> ds.halt(True) # read datetime after 1 second >>> ds.datetime() (2018, 3, 24, 6, 13, 45, 24, 0) # read datetime after 1 second (no change) >>> ds.datetime() (2018, 3, 24, 6, 13, 45, 24, 0) # minute increment (00:00:59 -> 00:01:00) >>> ds.datetime((2018, 3, 24, 6, 0, 0, 58, 0)) >>> ds.datetime() (2018, 3, 24, 6, 0, 0, 59, 0) >>> ds.datetime() (2018, 3, 24, 6, 0, 1, 0, 0) # hour increment (00:59:59 -> 01:00:00) >>> ds.datetime((2018, 3, 24, 6, 0, 59, 58, 0)) >>> ds.datetime() (2018, 3, 24, 6, 0, 59, 59, 0) >>> ds.datetime() (2018, 3, 24, 6, 1, 0, 0, 0) # day + weekday increment (23:59:59 Sat -> 00:00:00 Sun) >>> ds.datetime((2018, 3, 24, 6, 23, 59, 58, 0)) >>> ds.datetime() (2018, 3, 24, 6, 23, 59, 59, 0) >>> ds.datetime() (2018, 3, 25, 0, 0, 0, 0, 0) # month increment (Wed 28th Feb 2018 -> Thu 1st Mar 2018) >>> ds.datetime((2018, 2, 28, 3, 23, 59, 58, 0)) >>> ds.datetime() (2018, 2, 28, 3, 23, 59, 59, 0) >>> ds.datetime() (2018, 3, 1, 4, 0, 0, 0, 0) # month increment on leap year Feb has 29 days (Sun 28th Feb 2016 -> Mon 29th Feb 2016) >>> ds.datetime((2016, 2, 28, 0, 23, 59, 58, 0)) >>> ds.datetime() (2016, 2, 28, 0, 23, 59, 59, 0) >>> ds.datetime() (2016, 2, 29, 1, 0, 0, 0, 0) # month increment on leap year (Mon 29th Feb 2016 -> Tue 1st Mar 2016) >>> ds.datetime((2016, 2, 29, 1, 23, 59, 58, 0)) >>> ds.datetime() (2016, 2, 29, 1, 23, 59, 59, 0) >>> ds.datetime() (2016, 3, 1, 2, 0, 0, 0, 0) # year increment (31st Dec 2018 -> 1st Jan 2019) >>> ds.datetime((2018, 12, 31, 1, 23, 59, 58, 0)) >>> ds.datetime() (2018, 12, 31, 1, 23, 59, 59, 0) >>> ds.datetime() (2019, 1, 1, 2, 0, 0, 0, 0) # square wave output on pin SQ - 1Hz >>> ds.square_wave(1, 0) # square wave output on pin SQ - 4.096kHz >>> ds.square_wave(4, 0) # square wave output on pin SQ - 8.192kHz >>> ds.square_wave(8, 0) # square wave output on pin SQ - 32.768kHz >>> ds.square_wave(32, 0) # logic level output on pin SQ - high >>> ds.square_wave(0, 1) # logic level output on pin SQ - low >>> ds.square_wave(0, 0)

>>> from machine import Pin >>> import onewire >>> ow = onewire.OneWire(Pin('A9')) >>> ow.scan() [bytearray(b'(\xc9E\x01\x00\x00\x80/')] >>> import time, ds18x20 >>> ds = ds18x20.DS18X20(ow) >>> roms = ds.scan() >>> ds.convert_temp() >>> time.sleep_ms(750) >>> for rom in roms: ... print(ds.read_temp(rom)) 23.8125

>>> from machine import I2C, Pin >>> i2c = I2C(3) # SCL=A8, SDA=C9 >>> i2c.scan() [80, 104] >>> import at24c32n >>> eeprom = at24c32n.AT24C32N(i2c) # read 32 bytes starting from memory address 0 >>> eeprom.read(0, 32) b'\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff' # write hello world to memory address 0 >>> eeprom.write(0, 'hello world') # read back the hello world >>> eeprom.read(0, 32) b'hello world\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff' >>> eeprom.read(0, 11) b'hello world' # write multiple pages (32 bytes per page) >>> eeprom.write(0, b'abcdefghijklmnopqrstuvwxyz0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ') # read multiple pages (32 bytes per page) >>> eeprom.read(0,64) b'abcdefghijklmnopqrstuvwxyz0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ\xff\xff' # mutliple page writes (fill pages 0 and 1 with test data) # write is performed in two steps, "0" x 32 in the first page, then "1" x 32 in the next page # memory address was at the start of a page boundary so each write is a full 32 byte page write >>> eeprom.write(0, b'0000000000000000000000000000000011111111111111111111111111111111') >>> eeprom.read(0,64) b'0000000000000000000000000000000011111111111111111111111111111111' # partial page writes # write some bytes spanning two pages, not starting at a page boundary # write is performed in two steps, "abc" in the first page then "def" in the next page >>> eeprom.write(29, b'abcdef') >>> eeprom.read(0,64) b'00000000000000000000000000000abcdef11111111111111111111111111111' # fill entire eeprom with 0xFF >>> buf = b'\xff' * 32 >>> for i in range(128): ... eeprom.write(i*32, buf) # show page boundaries >>> for i in range(128): ... eeprom.write(i*32, '|-Page-{:-<24}|'.format(i)) >>> eeprom.read(0,128) b'|-Page-0-----------------------||-Page-1-----------------------||-Page-2-----------------------||-Page-3-----------------------|' # read entire eeprom >>> eeprom.read(0,4096)

# on the PyBoard or a STM32F407 rtc = pyb.RTC() # set time rtc.datetime((2018, 3, 24, 6, 13, 45, 21, 0)) # attach battery between GND + VBAT # disconnect, reconnect # get time print(rtc.datetime())