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-C6 board |
Slave MCU. |
USB cable (ESP32-C6 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-C6 board) |
AT command/response connection. |
Connection of Components for ESP-AT Testing
Note:
In the above picture, four jump wires are used to connect the ESP32-C6 board and USB to serial converter. If you do not use hardware flow control, two wires connecting TX/RX and a simpler converter will be enough.
If you use an ESP32-C6 module instead of a development board and flash firmware via UART, you need to reserve the UART pins (refer to https://www.espressif.com/sites/default/files/documentation/esp32-c6_datasheet_en.pdf > Section Pin Description for more details) and strapping pins (refer to https://www.espressif.com/sites/default/files/documentation/esp32-c6_datasheet_en.pdf > Section Strapping Pins for more details), and enter the download mode by controlling the strapping pin level.
ESP32C6-4MB Series
ESP32C6-4MB series refer to the module or board that has a built-in ESP32-C6 chip with a 4 MB flash, such as ESP32C6-MINI series device and ESP32C6-WROOM series device.
ESP32C6-4MB 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 |
ESP32C6-4MB Board Pins |
Other Device Pins |
|---|---|---|
Download/Log output 1 |
|
|
AT command/response 2 |
|
|
Note 1: Connection between individual pins of the ESP32C6-4MB board and the PC is already established internally on the ESP32C6-4MB 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.
ESP32C6-4MB Series Hardware Connection
If you want to connect your device directly with ESP32C6-4MB module rather than the ESP32C6-4MB board that integrates it, please refer to the corresponding module datasheet for more details.