(Video) As we are plowing through the last of our chip-shortage-recovery revisions, next up we’re about to do a bunch of Raspberry Pi HAT displays. HATs are 9 years old, and are a standardized way of Attaching Hardware on Top of RPi’s.
Given the RPi shortage is also over, thankfully, it’s time to look at more HATs! One feature that HATs have is an onboard EEPROM that helps identify the board via a set of extra I2C pins – this EEPROM can be used to load device tree fragments, contain MAC addresses, calibration details or other non-secured unique data. We’ve covered 25Q series SPI Flash memory before, and 24-series looks soooo similar but they are not! Let’s look at some options for adding generic 32Kbit / 4 KByte I2C EEPROMs including some things to watch out for so you don’t make mistakes we have.
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