Zee one picon transparent1/30/2023 The DS3231 RTC already has kernel support, and technically we don't need to download anything. The RPi built-in 1.8K resistance is quite strong, and should be more than enough.Īfter the first RPi boot with a pristine Raspbian lite image, I am running raspi-config to enable I2C, SPI, SSH and to configure the network access for further package downloads. For now I use R14/R15 as hook-up points to the oscilloscope, and remove them from further revisions. This means I wont need external pull-ups. When I got the Pi Zero later, I could clearly see the tiny pull-ups, they are placed next to the GPIO pins. For the first "Alpha" board I added the pull-up pair (R14,R15) to the footprint, and populated them with 10K. I wasn't sure, but all Raspberry Pi versions are said to be fitted with I2C pull-up resistors. To save PCB space, I placed the RTC IC, the backup battery holder, and the I2C pull-up resistors underneath the Raspberry Pi Zero W. The first and easiest device to test and integrate is the DS3231 realtime clock.
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