Last Updated on 25 July 2024 by Suffocation
Ein kleines ESP32 C3 Board zum Preis 04/2024 von rund ~3€ ohne Versand. Für kleinere Projekte sollte das Board ausreichend sein, Es bietet jedoch viele Vorteile des ESP32 wie WLAN und BlueTooth.
Facts
| Description | Worth |
|---|---|
| Processor | ESP32-C3 Risc-V |
| Wi-Fi | 802.11 b/g/n 2.4Ghz |
| Bluetooth | 5.0 |
| DeepSleep power consumption | 43 µA |
| SRAM | 400KB |
| FLASH | 4 Megabytes |
| Chip Model | ESP32C3FN4 |
| External view of ADC | 4 |
| Externally accessible GPIOs | 11 |
| Blue LED | GPIO 8 |
| Dimension | 18mm x 22.5mm |
Nachtrag 25.07.2024: Pinout der Rückseite unterscheiden sich einwenig zur Vorderseite. Zum einen durch die ADC Benennung zum andernen durch die SPI. Beim SPI an GPIO 4-7 ist SPI0/1 gemeint. An GPIO 8-10 soll der SPI2 betrieben werden, wobei dieser in seiner Pinbelegung frei über alle GPIOs wählbar ist.
Views
Programming
ESP32 Boardsupport must be installed. (See HERE)
Miscellaneous
Keine verlöteten Pins
Ich habe die Version ohne verlötete Pins bestellt, um Verbindungen direkt an den ESP löten zu können. Wer nicht löten mag, sollte eine Version bestellen bei denen die Pins schon befestigt sind.
Pin Multiplexer Assignment
SPI Pinout
Conclusion
USB C, schön klein was braucht man mehr? Eine Frage die sich auch Seeed Studio gestellt hat und eine Verbesserte Version auf den Markt gebracht hat (ESP32-C3 Seed Studio Xiao).
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Sources
Arduino Forum Entry on the Topic
LOG
| Date | Description |
|---|---|
| 06.04.2024 | Post created |
| 25.07.2024 | Auf Anfrage von Hans Herzig, SPI Informationen und Datenblatt hinzugefügt um die Belegung der SPIs am Board zu klären. |
| Date | Change | Author |
|---|---|---|
| 06.04.2024 | Post created | Suffocation |
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.
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. .
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
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
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
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
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