example_blynk_client

---

title: Blynk Client

Blynk Client

This example connects a TinyGSM modem to Blynk so a device can exchange data and be controlled from the Blynk app.

---

The Complete Code

/** ============================================================================
 * @example{lineno} BlynkClient.ino
 *
 * @brief This sketch connects to Blynk using TinyGSM and a GSM modem.
 *
 * For this example, you need to install Blynk library:
 *   https://github.com/blynkkk/blynk-library/releases/latest
 *
 *
 * Blynk is a platform with iOS and Android apps to control
 * Arduino, Raspberry Pi and the likes over the Internet.
 * You can easily build graphic interfaces for all your
 * projects by simply dragging and dropping widgets.
 *
 * [Blynk](http://www.blynk.io/) supports many development boards with WiFi,
 * Ethernet, GSM, Bluetooth, BLE, USB/Serial connection methods. See more in
 * [Blynk library examples and community forum](http://community.blynk.cc/).
 *
 * Change GPRS apn, user, pass, and Blynk auth token to run :)
 * ========================================================================== */

#define BLYNK_TEMPLATE_ID "TMPxxxxxx"
#define BLYNK_TEMPLATE_NAME "Device"
#define BLYNK_AUTH_TOKEN "YourAuthToken"

#define BLYNK_PRINT Serial  // Comment this out to disable prints and save space

// Default heartbeat interval for GSM is 60
// If you want override this value, uncomment and set this option:
// #define BLYNK_HEARTBEAT 30

// Select your modem:
// #define TINY_GSM_MODEM_SIM800
// #define TINY_GSM_MODEM_SIM808
// #define TINY_GSM_MODEM_SIM868
// #define TINY_GSM_MODEM_SIM900
// #define TINY_GSM_MODEM_SIM7000
// #define TINY_GSM_MODEM_SIM7000SSL
// #define TINY_GSM_MODEM_SIM7080
// #define TINY_GSM_MODEM_SIM5360
// #define TINY_GSM_MODEM_SIM7600
// #define TINY_GSM_MODEM_A7672X
// #define TINY_GSM_MODEM_UBLOX
// #define TINY_GSM_MODEM_SARAR4
// #define TINY_GSM_MODEM_SARAR5
// #define TINY_GSM_MODEM_M95
// #define TINY_GSM_MODEM_BG95
// #define TINY_GSM_MODEM_BG96
// #define TINY_GSM_MODEM_A6
// #define TINY_GSM_MODEM_A7
// #define TINY_GSM_MODEM_M590
// #define TINY_GSM_MODEM_MC60
// #define TINY_GSM_MODEM_MC60E
// #define TINY_GSM_MODEM_ESP32
// #define TINY_GSM_MODEM_ESP8266
// #define TINY_GSM_MODEM_ESP8266_NONOS
// #define TINY_GSM_MODEM_XBEE
// #define TINY_GSM_MODEM_SEQUANS_MONARCH

#include <TinyGsmClient.h>
#include <BlynkSimpleTinyGSM.h>

#if (defined(ARDUINO_NRF52840_FEATHER)) && !defined(ADAFRUIT_TINYUSB_H_)
#include <Adafruit_TinyUSB.h>  // for Serial
#endif

// Set serial for debug console (to the Serial Monitor)
#define SerialMon Serial

// Hardware Serial on Mega, Leonardo, Micro
#if !defined(__AVR_ATmega328P__) && !defined(SerialAT)
#define SerialAT Serial1

// or Software Serial on Uno, Nano
#elif !defined(SerialAT)
#include <SoftwareSerial.h>
SoftwareSerial SerialAT(2, 3);  // RX, TX
#endif


// Your GPRS credentials, if any
const char apn[]  = "hologram";
const char user[] = "";
const char pass[] = "";

// You should get Auth Token in the Blynk App.
// Go to the Project Settings (nut icon).
const char auth[] = "YourAuthToken";

TinyGsm modem(SerialAT);

void setup() {
  // Set console baud rate
  SerialMon.begin(115200);
  delay(10);

  // Set GSM module baud rate
  SerialAT.begin(115200);
  delay(6000);

  // Restart takes quite some time
  // To skip it, call init() instead of restart()
  SerialMon.println("Initializing modem...");
  modem.restart();

  String modemInfo = modem.getModemInfo();
  SerialMon.print("Modem Info: ");
  SerialMon.println(modemInfo);

  // Unlock your SIM card with a PIN
  // modem.simUnlock("1234");

  Blynk.begin(auth, modem, apn, user, pass);
}

void loop() {
  Blynk.run();
}

---

Generated by Doxygen and m.css with templates from doxybook2 Updated on 2026-09-11