ESP32-C3 Super Mini Board

8 thoughts on “ESP32-C3 Super Mini Board”

1. There are variants with an I-PEX/U.FL connector for an external antenna. On some of them, it may be necessary to resolder a jumper on the board between the internal and external antenna.
   There are also nice little breakout boards.

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2. Hello, is it possible to set Arduino digital outputs GPIO 0 – 4 as open-collector using the Arduino IDE? How? And GPIO 5 as a digital input with pull-up?
   Thanks for your help. .

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   1. Hello JoKa,

      Open collector, in the sense of a higher input voltage, shouldn't work. Connecting multiple outputs together (bus) might be possible as these are protected by diodes. However, I don't have any knowledge about that. Digital output with pull-up:
      When initialising:
      pinMode(BUTTON_PIN, INPUT_PULLUP);

      Take a look here too https://roboticsbackend.com/arduino-input_pullup-pinmode/

      Greetings Stefan

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   2. Output als open-Collector einstellen – NEIN.
      Digital-Input mit (intern) Pullup – JA
      Hinweis: Ein Blick in die Spezifikation verrät, dass die GPIO Pins – im Gegensatz zur häufig vertetenen Auffassung – NICHT „fehlertolerant“ sind und durch Anlegen von höherer Spannung als der Versorgungsspannung des Chips beschädigt, bzw. zerstört werden können. Die integrierten Schutzdioden könnte man prinzipiell dafür verwenden, aber nur, dann wenn man den Strom entsprechend begrenzt. Ist aber wegen zusätzlicher Verlustleistung und Störeinflüssen nicht empfehlenswert. Abgesehen davon kosten LevelShifter boards eh so gut wie nix.

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3. Good evening,
   On many websites, I find the pinout for the ESP32-C3 Super Mini, both from the top and bottom sides. What I've noticed is,
   that MISO, MOSI, SCK in particular are not on the same pins. Why this difference? Can someone explain this to me? In my application (assignment according to the top side) everything works fine.

   Thank you for your „enlightenment“

   Kind regards
   Hans Herzig

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   1. Hello Hans,

      I think you mean the SPI interface when you write MOSI, MISO, SCK. The C3 has a total of 3 SPI interfaces. 0/1 are intended for the flash memory and are routed out to GPI 4-7. According to the datasheet, SPI 2 can be operated on any GPIO pin. I have added the corresponding pictures and datasheets to the post. However, it is still unclear to me why the analogue inputs are named differently and not according to the ADC1/2 and the port. I hope this helps. Regards Stefan

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      1. Has anyone ever done/seen an SPI project with clear SPI wiring? The confusion with the pins is perfect. Which pins/GPIOs are wired how to correctly wire, for example, a C1101 from the ESP32C3 SUPER MINI. Many thanks for any feedback, Gilli

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         1. läuft seit fast 3 Jahren ohne Probleme
            c3-sm – ips tft (ST7789)
            MISO D5 – n.a.
            MOSI D6 – SDA
            CS D7 – CS
            RST D9 – RES
            DC D10 – DC
            SCLK D4 – SCL
            BL D21 – BLK

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