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Built-in project · ESP32-C3-DevKitM-1

ESP32-C3 serial

The board on its own, printing its uptime once a second on UART0 and echoing anything typed into the serial monitor. The whole build, an ESP32-C3, runs here in your browser on the firmware below; open it in the editor to change the wiring or the code and run it again.

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ESP32-C3 serial · ESP32-C3-DevKitM-1live0.000 s 0.00x
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The circuit itself, running here on the simulator. Press what can be pressed; click anything else to open it in the editor.

The code

The firmware exactly as the editor opens it. Change a line there and press Run: it compiles in the browser.

sketch.ino · ESP32-C3-DevKitM-1
// Serial: print once a second, echo what arrives.
//
// Serial is UART0, which is the board's channel to the serial monitor at the
// bottom of the window. Type into the monitor and the characters come back
// with a prefix.
//
// Serial.print blocks while the 128-byte transmit FIFO is full, so a long
// line costs simulated time at the configured baud rate, exactly as it would
// on the real board.

unsigned long lastReport = 0;

void setup() {
  Serial.begin(115200);
  Serial.println("Mokxi ESP32-C3: serial example");
  Serial.print("pi to five places is ");
  Serial.println(3.14159265, 5);
}

void loop() {
  unsigned long now = millis();
  if (now - lastReport >= 1000) {
    lastReport = now;
    Serial.print("up ");
    Serial.print(now);
    Serial.println(" ms");
  }

  while (Serial.available() > 0) {
    int c = Serial.read();
    if (c == '\r') {
      continue;
    }
    Serial.print("you typed: ");
    if (c == '\n') {
      Serial.println("<newline>");
    } else {
      Serial.print((char)c);
      Serial.print(" (0x");
      Serial.print(c, HEX);
      Serial.println(")");
    }
  }
}

Parts list

2 parts, plus the jumper wires. Every one is in the editor's parts bin.

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