Hardware Connection
This document introduces what hardware you need to prepare and how to connect them in order to download AT firmware, send AT commands, and receive AT responses.
For different series of modules, the commands supported by AT firmware are different. Please refer to ESP-AT Firmware Differences for more details.
What You Need
Component |
Function |
|---|---|
ESP32-C3 board |
Slave MCU. |
USB cable (ESP32-C3 borad to PC) |
Download/Log output connection. |
PC |
Act as Host MCU. Download firmware to Slave MCU. |
USB cable (PC to serial port converter) |
AT command/response connection. |
USB to serial port converter |
Convert between USB signals and TTL signals. |
Jumper wires (serial port converter to ESP32-C3 board) |
AT command/response connection. |
Connection of Components for ESP-AT Testing
Please note that in the above picture, four jump wires are used to connect the ESP32-C3 board and USB to serial converter. If you don’t use hardware flow control, two wires connecting TX/RX and a simpler converter will be enough.
ESP32-C3 Series
ESP32-C3 AT uses two UART ports: UART0 is used to download firmware and log output; UART1 is used to send AT commands and receive AT responses. Both UART0 and UART1 use 115200 baud rate for communication by default.
Function of Connection |
ESP32-C3 Board Pins |
Other Device Pins |
|---|---|---|
Download/Log output 1 |
|
|
AT command/response 2 |
|
|
Note 1: Connection between individual pins of the ESP32-C3 board and the PC is already established internally on the ESP32-C3 board. You only need to provide USB cable between the board and PC.
Note 2: Connection between CTS/RTS is optional, depending on whether you want to use hardware flow control.
ESP32-C3 Series Hardware Connection
If you want to connect your device directly with ESP32-C3-MINI-1 module rather than the ESP32-C3 board that integrates it, please refer to ESP32-C3-MINI-1 Datasheet for more details.