One web request from your sketch, charts you can open anywhere

Send Arduino and ESP32 sensor data to a website

Your Arduino sketch can print a reading to the serial monitor. To see it on your phone, keep a history and get an email when the board goes quiet, have it send each reading to SensorConsole as a web request. An ESP32 or ESP8266 does this in about a dozen lines using the standard HTTP client that comes with the board package. The address accepts plain HTTP, so even boards that cannot do encrypted connections work out of the box.

What you can monitor

• Any value a sketch can read: temperature, humidity, soil moisture, light, distance, pressure, gas, current and more
• Several values in one request, each drawn as its own chart

How to connect Arduino and ESP32 online

1. Create a generic push device In SensorConsole, choose Connect a sensor, pick Generic/DIY push, and copy the token from the device page.
2. Paste the sketch below Replace the Wi-Fi name, the Wi-Fi password and YOUR_TOKEN. Adjust the sensor pin and the reading function to match your wiring.
3. Upload and check the serial monitor A reply of 200 means the reading was stored. It shows on the device page straight away.
4. Send every 5 minutes or slower Each device accepts one request every 10 seconds, and a history point is saved every 5 minutes. A faster request gets reply code 429.

#include <WiFi.h>
#include <HTTPClient.h>

const char* WIFI_NAME = "your-wifi-name";
const char* WIFI_PASSWORD = "your-wifi-password";
const char* TOKEN = "YOUR_TOKEN";

const int SENSOR_PIN = 34;     // use an ADC1 pin (32 to 39), ADC2 stops working with Wi-Fi on
const int DRY_VALUE = 2900;    // reading in dry air, measure your own
const int WET_VALUE = 1300;    // reading in a glass of water, measure your own

void connectWifi() {
  WiFi.begin(WIFI_NAME, WIFI_PASSWORD);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
  }
}

int readMoisturePercent() {
  long total = 0;
  for (int i = 0; i < 10; i++) {
    total += analogRead(SENSOR_PIN);
    delay(20);
  }
  int raw = total / 10;
  return constrain(map(raw, DRY_VALUE, WET_VALUE, 0, 100), 0, 100);
}

void sendReading(int moisture) {
  HTTPClient http;
  String url = String("http://sensorconsole.com/ingest-generic-push.php?token=")
               + TOKEN + "&soil_pct=" + moisture;
  http.begin(url);
  int code = http.GET();
  Serial.print("Server replied: ");
  Serial.println(code);
  http.end();
}

void setup() {
  Serial.begin(115200);
  connectWifi();
}

void loop() {
  if (WiFi.status() != WL_CONNECTED) {
    connectWifi();
  }
  sendReading(readMoisturePercent());
  delay(300000);   // one reading every 5 minutes
}

YOUR_TOKEN is the device token shown on your device page after you create a generic push device.

Use cases

Questions about Arduino and ESP32 and SensorConsole

Guides

Also works with