SIM800L
Struggling with standalone SIM800L power issues? Discover how the LilyGo T-Call ESP32 solves cellular IoT hardware headaches. In this step-by-step tutorial, learn how to wire, code, and successfully connect your board to a cellular network using the TinyGSM library.
Learn MQTT
Take your IoT projects off the grid. Learn how to transmit real-time sensor data over 4G LTE using the ESP32 and SIM A7670G, and store it permanently in your own MySQL database using a secure MQTT pipeline. This guide covers everything from hardware wiring to the Python backend script.
SIMA7670G 4G
Take your IoT projects off the grid! This tutorial walks you through connecting the SIMA7670G 4G LTE module to an ESP32. We cover the critical power-up sequence, wiring diagrams, and provide full source code to Publish sensor data and Subscribe to remote commands via MQTT.
Raspberry Pi
Don't have a spare monitor? No problem. Learn how to set up your Raspberry Pi 5 completely headless. This step-by-step guide covers flashing the OS, finding your IP address, enabling SSH, and accessing the full desktop via VNC Viewer.
SIMA7670G 4G
In Part 2 of our 4G IoT series, we move beyond hardware setup to real communication. Learn how to write code to automatically send text messages from your ESP32 and listen for incoming SMS commands using the SIM A7670G LTE module. Perfect for remote control projects!
SIMA7670G 4G
Are you ready to upgrade your IoT projects from 2G to 4G? In this tutorial, we explain why the SIM A7670G is the best replacement for the SIM800L, how to wire it correctly to an ESP32, and providing the exact code to get you online.
Learn MQTT
Setting up a database is crucial for any IoT or web project. In this guide, we walk you through installing MySQL on any Ubuntu VPS, securing it against threats, and connecting remotely using SSH Tunneling—the safest way to manage your data without exposing ports to the internet.
Learn MQTT
I have launched a dedicated, free-to-use public MQTT broker for the developer community! Whether you are testing an ESP32 or building a web dashboard, click here for the connection details, ports, and code examples to get started with mqtt.iotbhai.io.
Arduino
Struggling with the SIM800L blinking fast and never connecting? The problem is almost always power. In this first episode of GSM Bootcamp, I show you how to build a robust circuit using a voltage booster and capacitor to ensure your Arduino IoT project gets a stable signal every time.
Encountering the human_face_detect_msr01.hpp compilation error on your new ESP32-S3 Cam? This usually happens with ESP32 Board Manager v3.0+. Check out this simple code tweak to resolve the issue and get your video streaming instantly without downgrading your tools.
Control your ESP32 via WhatsApp! This tutorial builds a complete two-way bridge using Python & MQTT. Send "LED ON" from your phone and get a real-time reply from your device confirming the action.
Deploying IoT devices is easy, but updating them once they are mounted on a wall is hard. Discover how to turn your Google Drive into a free, reliable server for ESP32 Over-The-Air (OTA) updates. Save money on cloud hosting and skip the complex server configuration with this "IoT Bhai" guide.
Tired of heavy libraries and infinite boot loops? Learn to build a professional, lightweight ESP32 WiFi Manager from scratch. This guide covers a custom "Verify-Before-Save" feature that tests credentials before storing them, ensuring your IoT devices are reliable and user-friendly.
The ultimate guide to setting up ESP32 on Arduino IDE 2.0. This post covers the Board Manager URL, driver installation (CP210x/CH340), and critical permissions for both Windows and Ubuntu Linux users. Fix common connection issues and start coding today.
Stop hardcoding Wi-Fi credentials! Learn how to build a professional configuration mode for your ESP32 using the Preferences library and a WebServer.
Securing your firmware is critical. In this tutorial, we ditch the public clouds and build a secure, automated Over-the-Air (OTA) update system for the ESP32 using Private GitHub Repositories and Personal Access Tokens.
Learn how to perform remote OTA firmware updates on ESP32 using the SIM800L GSM module (2G). A complete guide to building a Python Flask update server for IoT devices without Wi-Fi coverage.
In Part 5 of the GSM IoT Series, we ditch Wi-Fi and go cellular! Learn how to publish sensor data and control your ESP32 from anywhere in the world using a SIM800L module and MQTT. Includes full code and wiring diagrams.
Does your remote IoT project need accurate time but lacks WiFi? Forget expensive RTC modules! In this tutorial, we use the SIM800L GSM module to fetch precise atomic time from an NTP server over GPRS. Perfect for data logging in the field.
Wi-Fi isn't always an option. In this tutorial, we take our GSM skills to the next level by building a two-way communication system. You'll learn how to make your ESP32 text you automatically and how to query its status from anywhere in the world using simple SMS commands.
Stuck with the dreaded 'fast blink' on your GSM module? 90% of SIM800L issues come down to power. Discover the capacitor hack and the exact voltage settings you need to get your IoT project online, whether you use an ESP32 or Arduino.
