ESP32

[中文]

The ESP32 downloads firmware via UART0 (TX0 (GPIO1) and RXD (GPIO3) ) by default.

Hardware Connection

The following wiring conditions need to be satisfied:

VDD     -> 3V3
GND     -> GND
EN      -> Pull Up    (Used for power on Control, can't be float)
GPIO0   -> Pull Down  (Enter download mode)
GPIO2   -> Pull Down  (Default is lw level)
TXD0(GPIO1)    -> RX
RXD0(GPIO3)    -> TX

Note

  • The Strapping pin GIO12(MTDI) is used for selecting the VDD_SPI Flash voltage.

    • When use the 1.8V VDD_SPI Flash , the GIO12(MTDI) need pull up when chip power on.

    • When use the 3.3V VDD_SPI Flash , the GIO12(MTDI) need pull down when chip power on.

Hardware conditions must be met

  • ESP32 chip working voltage range is 2.3 V ~ 3.6 V; if you use a single power supply, the recommended voltage of the power supply is 3.3 V, and its recommended output current is 500 mA or more.

  • ESP32 modules working voltage range is 3.0 V ~ 3.6 V; if you use a single power supply, the recommended voltage of the power supply is 3.3 V, and its recommended output current is 500 mA or more.

Reference

Hardware wiring principle summary:

Official Documentation: