@pac_71 No. A Pull-Up resistor connected between P8 and 3.3 V dose not require extra action. At a value of 4.7k or 10k, some other units, the ESP32 or a logic output of an external device, can drive it low when needed. No switch is required. P8 is also used for the SD card. So connecting it directly to 3.3V would block the SD card.