Re: DS1307 on rpi4B
Daniel O'Connor <[email protected]>
| Newsgroups | gmane.os.freebsd.devel.arm |
|---|---|
| Message-ID | <[email protected]> |
> On 8 Dec 2024, at 14:42, 風來散人 <[email protected]> wrote: > I'm using this module (https://www.electronicwings.com/sensors-modules/real-time-clock-rtc-ds1307-module) and there are R2 and R3 for pull-up on the module. The registers are connected to 5V. This probably harms RPI4B because the voltage is 3.3V at RPI4B side. So I removed R2 and R3. That's why internal pull-up is required. Ah that is unfortunate. There is 3.3V on the 40 pin RPi header you could connect to R2/R3 (and cut the connection to 5V obviously). -- Daniel O'Connor "The nice thing about standards is that there are so many of them to choose from." -- Andrew Tanenbaum