MeKENtronics
Ever wondered what actually happens inside your ESP32 when you set a pin to INPUT_PULLUP? ⚡🛡️ Unconnected digital pins act like antennas, picking up electromagnetic noise that causes erratic, floating logic values. When you declare pinMode(pin, INPUT_PULLUP) in code, the ESP32 internally switches on a physical transistor that connects the GPIO pin directly to 3.3V through an internal resistor (~45kΩ). #engineering #mechatronics #esp #eletronics #computere
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