Documentation

// D1 R32 ESP32 - Blink onboard LED
// Board: ESP32 Dev Module (or "WEMOS D1 MINI ESP32")
// Upload Speed: 460800

#define LED_PIN 2  // onboard LED on most D1 R32 boards

void setup() {
  pinMode(LED_PIN, OUTPUT);
}

void loop() {
  digitalWrite(LED_PIN, HIGH);
  delay(500);
  digitalWrite(LED_PIN, LOW);
  delay(500);
}

// D1 R32 - Connect to WiFi and print the IP address

#include <WiFi.h>

const char* ssid     = "YOUR_WIFI_SSID";
const char* password = "YOUR_WIFI_PASS";

void setup() {
  Serial.begin(115200);
  delay(100);

  WiFi.begin(ssid, password);
  Serial.print("Connecting");
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println();
  Serial.print("Connected, IP: ");
  Serial.println(WiFi.localIP());
}

void loop() {
  // your code
}

// D1 R32 - Read analog on UNO header A0 (mapped to GPIO 36 / SVP)

const int analogPin = 36;  // UNO A0 header position

void setup() {
  Serial.begin(115200);
  analogReadResolution(12);  // 12-bit (0..4095)
}

void loop() {
  int raw = analogRead(analogPin);
  float volts = raw * 3.3 / 4095.0;
  Serial.printf("Raw: %d   V: %.2f\n", raw, volts);
  delay(500);
}

# MicroPython on D1 R32 ESP32
# Flash latest ESP32 firmware first using esptool.py

from machine import Pin
import network, time

# Onboard LED
led = Pin(2, Pin.OUT)

# Connect to WiFi
wlan = network.WLAN(network.STA_IF)
wlan.active(True)
wlan.connect("YOUR_SSID", "YOUR_PASS")

while not wlan.isconnected():
    time.sleep(0.5)
    print("connecting...")

print("IP:", wlan.ifconfig()[0])

while True:
    led.value(not led.value())
    time.sleep(0.5)