I want to get started in the Internet of Things but I don't know where to begin. I need an overview of the basic steps: choosing a network architecture, common communication protocols, how to organize sensors and actuators, and what criteria to use for power supply and security. I'm also interested in knowing what types of development platforms are most accessible for students and what online resources you would recommend for learning without spending much. What methodologies do you follow when designing an IoT project from scratch? I appreciate any advice or experience you can share.
How do I start an IoT project on a tight budget?
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Have you thought about what type of power source (rechargeable batteries, solar, or wired power) you'll use for the sensors in your project? Also, do you prefer implementing MQTT over Wi-Fi or a low-power protocol like LoRa for communication?
Hey, thanks for the detailed question! For budget-friendly IoT projects, I usually go with Wi-Fi modules like ESP8266 or ESP32, the MQTT protocol, and open-source tools like Node-RED or Arduino IDE. A USB power bank works great for power. What kind of sensors are you thinking about using?
When I started my first IoT project, I did it with just over €20, using an ESP8266 and a couple of DHT11 temperature and humidity sensors. First, I chose the architecture: a local Wi-Fi network because my router was already there, and the ESP has built-in Wi-Fi with low power consumption. For communication, I went with MQTT because it's lightweight and there are free brokers (like test.mosquitto.org) that work great for testing. I connected the sensors directly to the ESP, and for the actuators (a relay to turn a lamp on and off), I used a MOSFET transistor to handle higher currents without overloading the microcontroller.
As for power, most of the consumption comes from the Wi-Fi, so I powered the ESP with a 5V board and an AMS1117 regulator, which in turn was powered by a 2000mAh Li-Po battery. With deep-sleep mode enabled, the device lasts several days. For security, I implemented TLS in MQTT, used a strong password for the broker, and changed the router’s password too. For the development platform, I used Arduino IDE because it’s free and has tons of libraries; for learning, Random Nerd Tutorials and Andreas Spiess’ YouTube series are super clear and don’t require any investment. So, with cheap components and open-source software, you can build a working prototype without breaking the bank.