- Connect RAK2247 Concentrator module to Pi with this HAT – RAKwireless Store
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- Amazon.com: SparkFun Qwiic HAT for Raspberry Pi -Connect sensors & to a standard GPIO header Pi Tin compatible 4 Qwiic Daisy chain sensors & accessories Useful GPIO pins
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- Adafruit Ultimate GPS HAT for Raspberry Pi A+/B+/Pi 2/3/4/Pi 5 [Mini Kit] ID 2324 : $29.95 : Adafruit Unique & fun DIY electronics and kits
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- Adafruit Perma-Proto HAT for Pi Kit - No EEPROM : ID : $4.95 : Adafruit Unique & fun DIY electronics and
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- Best Raspberry Pi HATs 2023: Expansion for Every Project | Tom's Hardware