AT (from 'attention') commands were originally developed in 1981 for dial-up modems¹. Nowadays the idea is still being implemented in communication modems/modules. Sets of commands usually differ from device to device but the format of messages exchanged via UART is kept. Some common examples popular among DIYers include:

• GSM/GPRS modules such as SIM900²,
• BT/BLE modules such as AT-09/HM-10³,
• LoRa modules such as the ones from Reyax⁴,
• Wi-Fi modules such as ESP32 SoC flashed with a dedicated firmware.

This submission focuses on the last one. We will provide the network time to an STM32 uC that has no ETH peripheral. Such an approach, i.e. to have a separate uC/SoC responsible for wireless communication, is not uncommon in connected devices. A popular example of that is the Arduino UNO R4 WiFi board⁵.

• An ESP32-C6 evaluation board flashed with the newest ESP-AT firmware.
• A Nucleo board plus an OLED to talk to the ESP32-C6.
• A USB2UART converter for debugging plus the YAT serial terminal.
• A logic analyzer to be able to check the exchanged messages directly on the wires.

Don't worry 🙂 Just hit Alt-K to generate /Drivers/CMCIS/ and /Drivers/STM32G4xx_HAL_Driver/ based on the .ioc file. After a couple of seconds your project will be ready for building.

• What is ESP-AT
• Hardware Connection
• Wi-Fi AT Commands
• ESP-AT (firmware)
• Flash Download Tools for Windows or the cross-platform esptool.py

• ESP8266 WebServer using STM32 HAL (ControllersTech)
• ESP32 z STM32 na komendach AT - kontynuujemy walkę razem z Chat-GPT 4o (Mateusz Salamon)

Create your own home laboratory/workshop/garage! Get inspired by ControllersTech, DroneBot Workshop, Andreas Spiess, GreatScott!, ElectroBOOM, Phil's Lab, atomic14, That Project, Paul McWhorter, Max Imagination, and many other professional hobbyists sharing their awesome projects and tutorials! Shout-out/kudos to all of them!

190+ challenges to start from: Control Engineering for Hobbyists at the Warsaw University of Technology.

Stay tuned!