Pinout - nebkat/esp32-xbee GitHub Wiki

The ESP32 XBee was designed to conform to the standard set of XBee pins as found on official devices. Because of this there are a number of named pins on the board that might only be relevant on a fully featured XBee programming board, such as the XBee Grove Development Board.

I am currently designing an XBee proxy board that has both a plug and a socket to add the full functionality of the Grove to existing devices (such as SimpleRTK2B) in a much smaller form factor.

Pin

Physical pin number.

Mode

EN

Enable pin, resets the ESP32 when pulled low. Connected to the RESET button on XBee programming boards. See also Right Jumper.

BOOT

Boot mode pin, decides whether to boot into firmware download mode or normal mode. Connected to the BOOT button on the ESP32 XBee. See also Left Jumper.

Autoflashing

Autoflashing is the ability of the ESP32 XBee to be automatically reset into firmware download mode when requested by a PC. It is a useful feature when developing for the ESP32, as it removes the need to press buttons every time you want to upload new firmware. See also Jumpers.

3V3/GND

Power supply pins. The XBee socket must be capable of providing at least 500mA to the ESP32 XBee.

GPIO

General purpose input/output pins, as numbered by the ESP32.

Pins 18 (GPIO39) and 20 (GPIO36) are input only pins.

I2C

Standard XBee I2C pins.

Not currently used in this firmware, but can be configured to any other pins as needed.

UART

Standard XBee main and auxiliary UART pins.

UART0

U0TX and U0RX are the main communication ports for the board.

The flow control pins U0DTR/U0RTS/U0CTS are normally disabled and instead connected to the board Jumpers.

UART1

Not currently used in this firmware, but can be configured to any other pins as needed.

RGB LED

ESP32 XBee specific RGB status LED, active low. Red = GPIO21, Green = GPIO22, Blue = GPIO23.

LEDs

Standard XBee status LEDs.

RSSI

WiFi connection strength indicator, active high. Shines brightest when connection is good.

SLEEP

Device status indicator, active low. Not currently used in this firmware.

ASSOC

Associate indicator, active high. Not currently used in this firmware.

Buttons

Standard XBee buttons.

Reset

XBee reset button found on most XBee programming boards.

Commissioning

Used for pairing XBees to a network. Not currently used in this firmware.

Jumpers

There are two solder jumper connections on the ESP32 XBee, both used for autoflashing.

Neither jumper has any effect on the SimpleRTK2B as it does not have any connections except for power and TX/RX.

To disconnect the jumpers, simply scrape away the connection between the top and bottom with a sharp object, such as a pair of tweezers. To reconnect, apply some solder with a soldering iron to the two exposed pads.

Left Jumper

The left jumper connects the DTR pin of the XBee programming board to the BOOT pin of the ESP32.

Right Jumper

The right jumper connects the RTS pin of the XBee programming board to the EN pin of the ESP32.