Two of the sixteen pins are already spoken for, and one of them is the screen.
A C3 with a display soldered to it is not a C3 with a display wired to it: the bus, the pins and two of the GPIOs were decided at the factory. Here is that board's first hour, in order.
Everything here is written for this board. For a page that is true of every ESP32 rather than of one of them, the ESP32 book is next door.
The board in your hand
3 articlesWhat the chip is, which of the sixteen holes are already answering to something, and which way round the board seats on its expansion base.
Getting your computer to see it
2 articlesNo driver, one port, and one menu row that decides whether the board can talk back. Then the button sequence for the day it will not.
The screen
2 articlesIt is already wired, it is already on the bus, and it is 72 pixels wide. Two sketches: one that proves it is there, one that writes on it.
Off the bench
2 articlesA battery you can read the level of, and a radio that has to be turned down before the board will stay on a network.
Product questions
See what other owners have asked, and read their solutions.
ESP32-C3 OLED Development Board with Expansion Base
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The ESP32 book
Wi-Fi, BLE, the buses, deep sleep and OTA — written once for five chips, in Arduino C++ and MicroPython.
Read it →The layer under itElectricity
Volts, current, resistance, and the mistakes that kill parts. True of every board, including this one.
12 articles →