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first of all, the Uno R4 has a 5 V MCU and esp32 is a 3.3 V CPU. The Uno R4 WiFi has esp32-s3 as second MCU, but only as a WiFi adapter with AT firmware. (the Uno R4 Minima doesn't have WiFi.)– Juraj ♦Commented Jul 4, 2023 at 9:10
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