A complete archive of experiments using the SIM800L GSM/GPRS module. This collection covers wiring guides, power supply solutions, and code tutorials for sending SMS, making calls, and using GPRS connect with MQTT, HTTP, API, GPS for IoT data transmission with Arduino and ESP32.
SIM800L & ESP32
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.
SIM800L & ESP32
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.
SIM800L & ESP32
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.
SIM800L & ESP32
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.
SIM800L & ESP32
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.
ESP32
If you’ve ever connected a SIM800L to an ESP32 and thought, “Why does this thing reset the moment it finds a network?” — welcome. On paper, GSM modules are simple. In reality, the SIM800L is one of the most misunderstood modules in IoT. Most failures don’t come from code.