ValueError: Unable to find DS1307 at i2c address 0x68.

[soneups]

if i 'i2c.scan()' i can see the ds1307 at 0x68 however the last command to setup the rtc fails with an unable to find DS1307 at i2c address ox68 - any help or points greatly appreciated!

Adafruit CircuitPython 3.1.2 on 2019-01-07; Adafruit ItsyBitsy M4 Express with samd51g19

import busio
import adafruit_ds1307
import time
from board import *
myI2C = busio.I2C(SCL, SDA)
rtc = adafruit_ds1307.DS1307(myI2C)
Traceback (most recent call last):
File "", line 1, in
File "adafruit_ds1307.py", line 85, in init
ValueError: Unable to find DS1307 at i2c address 0x68.

[soneups]

Self resolving.

[Snudi]

@soneups : How did you solve it? im getting the same error with my RP2040 Board (Pimoroni Plasma Board) and a Sparkfun DS1307 Module. The Device Address is fine (0x68) and the SDA/SCL Pulled up but with the Adafruit DS1307 Library im getting the "ValueError: Unable to find DS1307 at i2c address 0x68." Error
Thanks a lot, Ruediger

[Snudi]

I solved it by Myself. In the Original .py File was a section to verify the correct RTC Board.
`# Try and verify this is the RTC we expect by checking the rate select
# control bits which are 1 on reset and shouldn't ever be changed.
buf = bytearray(2)
buf[0] = 0x07
with self.i2c_device as i2c:
i2c.write_then_readinto(buf, buf, out_end=1, in_start=1)

    if (buf[1] & 0b00000011) != 0b00000011:
        raise ValueError("Unable to find DS1307 at i2c address 0x68.")`

I removed it completly because i know it is the right board. Then i created a new DS1307 Library without this code. I append it on my comment. Now it works fine. Hope i could help someone with it in the Future. Best Ruediger

adafruit_ds1307.zip
.

[coplate]

I have submitted a Pull request for this issue, as the existing validation mentioned does not reflect the manufacturers documentation. Those 2 bits are intended to be alterable, not fixed.
#24