PV198 - UART II
One-chip Controllers
Daniel Dlhopolček, Marek Vrbka, Jan Koniarik, Oldřich Pecák,
Tomáš Rohlínek, Ján Labuda, Jan Horáček, Matúš Škvarla, Ondřej Bleha,
Martin Klimeš, Adam Valt
Faculty of Informatics, Masaryk University
10/2024
Introduction
Intro
Switch the branch to Week_10!
No homework for week 10.
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UART II
Introduction
Sometimes you cannot or don’t have to program the MCU
yourself
Instead control from other MCU or computer
Usually custom, device specific communication protocol
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UART II
AT-Commands
Protocol for controling other MCUs
Not standardized but shares some common structure and core
set of commands accross different devices
Originally used for modems
Nowadays mostly GSM/GPRS modules and other wireless
communication modules
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UART II
Goal
Control a MCU over UART from Python using AT-Commands
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UART II
Wiring and configuration
You will need ESP32-C6 DevKit and USB-UART bridge
Connect 5V, GND, RX, TX (don’t forget to swap RX and TX)
UART uses 115200 bauds/s, 1 stop bit, no parity and 8-bit data
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UART II
Task
1. Reset the board with at_reset.py script from study materials
2. Use Python to communicate with board and ensure that
commands are suffixed with ’\r\n’
3. Verify connection using the test command
4. Check status of Wi-Fi, scan the surronding networks and connect
to "PV198" with password "lDo53b8xp6aR"
5. Request contents of webpage located on
https://www.fi.muni.cz/~xrohlin/
AT-Commands documentation can be found here.
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UART II
Bonus Task
1. MQTT: Connect to "mqtt://test.mosquitto.org" and send and
receive messages to and from "PV198" topic
2. PWM: Connect the devkit to LED using breadboard and
genereate PWM
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