Modbus RTU Raspberry Pi Arduino and all that stuff - heliosoph
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Pi Links
Gpio Expansion Board Raspberry Pi B | Raspberry Pico Gpio Board - Raspberry Pi - Aliexpress
A more complete Raspberry Pi GPIO ALT function table : r/raspberry_pi
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Amazon.com: GPIO Reference Board for The Raspberry Pi Model A+, B+, Zero, 2, 3, 3B+, 4 (2 Pack) : Electronics
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