Connect to a WiFi network with Arduino on ESP32-C3

Updated on 27 October 2023

dev board ESP32-C3-DevKitM-1

chip ESP32-C3-MINI-1-N4

features wifi connect ssid esp32c3

Before starting

Dependancies

Ensure the following dependancies are downloaded and available:

Pre-requisites

Try these simpler or similar examples:

Buy the components

ESP32-C3-DevKitM-1

Code

Download code connect-wifi-arduino-esp32c3.ino

#include "WiFi.h"
#include "Secret.h"

void setup() {
  // (Optional)Press reset button
  // on the dev board to see these print statements

  Serial.begin(115200);
  while (!Serial) { }

  Serial.print("Attempting to connect to SSID: ");
  Serial.println(ssid);

  WiFi.useStaticBuffers(true);
  WiFi.mode(WIFI_STA);
  WiFi.begin(ssid, pass);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }

  Serial.println("");
  Serial.println("Connected to WiFi");
  printWifiStatus();
}

void loop() {}

void printWifiStatus() {
  Serial.print("SSID: ");
  Serial.println(WiFi.SSID());

  IPAddress ip = WiFi.localIP();
  Serial.print("IP Address: ");
  Serial.println(ip);

  long rssi = WiFi.RSSI();
  Serial.print("signal strength (RSSI):");
  Serial.print(rssi);
  Serial.println(" dBm");
}

Makefile

BOARD?=esp32:esp32:esp32c3
PORT?=/dev/cu.usbserial-*
BUILD=build
## Pass in V=--verbose to output more information than default

.PHONY: help default lint compile upload clean

default: clean lint compile upload

help: ## Show help message
	@awk 'BEGIN {FS = ":.*##"; printf "\nUsage:\n  make \033[36m\033[0m\n"} /^[$$()% 0-9a-zA-Z_-]+:.*?##/ { printf "  \033[36m%-15s\033[0m %s\n", $$1, $$2 } /^##@/ { printf "\n\033[1m%s\033[0m\n", substr($$0, 5) } ' $(MAKEFILE_LIST)

lint: ## Lint code using cpplint
	cpplint --extensions=ino --filter=-legal/copyright,-runtime/int *.ino

compile: ## Compile code and create the firmware binary
	arduino-cli compile $(V) --fqbn $(BOARD) --output-dir $(BUILD) ./

upload: ## Upload the firmware to the board
	arduino-cli upload $(V) --fqbn $(BOARD) --port $(PORT) --input-dir $(BUILD)

clean: ## Remove all built files
	rm -rf 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

Create a file Secret.h in the same folder with the code.

$ tree
.
├── Secret.h
└── connect-wifi-arduino-esp32c3.ino

Include the actual Wifi SSID name and password in the file.

char ssid[] = "secret";
char pass[] = "secret";

Compile and upload the firmware to connect to the WiFi.