Blinky with Arduino on ESP32-C3

Updated on 17 November 2023

dev board ESP32-C3-DevKitM-1

chip ESP32-C3-MINI-1-N4

features blinky led serial esp32c3

This tutorial is more than 1 year old. If the steps below do not work, then please check the latest versions and the documentations of the individual tools used.

Before starting

Dependancies

Ensure the following dependancies are downloaded and available:

ESP32 Arduino

Pre-requisites

Try these simpler or similar examples:

Hello world ESP32-S3

Buy the components

ESP32-C3-DevKitM-1

Code

Download code blinky-arduino-esp32c3.ino

// Switch LED between an external LED or the on-board LED
// #define LED LED_BUILTIN
#define LED 3

void setup() {
  pinMode(LED, OUTPUT);
  digitalWrite(LED, LOW);

  Serial.begin(115200);
  Serial.println("Start blinky");
}

void loop() {
  ledON();
  delay(200);

  ledOFF();
  delay(200);
}

void ledON() {
  Serial.println("LED ON");
  digitalWrite(LED, LOW);
}

void ledOFF() {
  Serial.println("LED OFF");
  digitalWrite(LED, HIGH);
}

Makefile

BOARD?=esp32:esp32:esp32c3
PORT?=/dev/cu.SLAB_USBtoUART*
BUILD=build

.PHONY: default lint all flash clean

default: lint all flash clean

lint:
	cpplint --extensions=ino --filter=-legal/copyright *.ino

all:
	arduino-cli compile --fqbn $(BOARD) --output-dir $(BUILD) ./

flash:
	arduino-cli upload --fqbn $(BOARD) --port $(PORT) --input-dir $(BUILD)

clean:
	rm -r build

Prototype

A photo of the actual setup.

Arduino IDE settings

Ensure the following IDE settings before flashing.

Serial console

Serial output from the firmware.

Description

The on-board LED LED_BUILTIN is GPIO8 as defined in the pin out.

Compile and upload the firmware via the Arduino IDE or arduino-cli with Makefile.