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Amazon.com: Serial Expansion HAT I2C Interface 2-ch Extra UART Plus 8 programmable GPIOs for Raspberry Pi Zero W WH 2B/3B/3B+/4B @XYGStudy : Electronics
Amazon.com: DB9M RS232 Serial Hat Port Expansion PCB Board for Raspberry Pi A+/ B+/ 2/3/ 4 /Zero/ZeroW, UART Port to Male DB9M RS232 Socket, Compact GPIO TX/RX/GND Solder Points : Electronics