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To design and implement a low-cost, internet-connected sensor node using the ESP8266 Wi-Fi microcontroller that can monitor environmental data (e.g., temperature, humidity) and transmit the data to a cloud server or local web dashboard for real-time monitoring.
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Description
The project is centered around the ESP8266 NodeMCU, a low-cost, Wi-Fi-enabled microcontroller that is ideal for IoT applications. This project aims to create a real-time environmental monitoring system that can measure temperature and humidity using sensors and display this data both locally and remotely. The ESP8266 connects to the internet via Wi-Fi, making it possible to send sensor readings to cloud platforms or web dashboards for remote monitoring.
At the core of the system is a DHT11 or DHT22 sensor, which captures temperature and humidity data from the surroundings. These readings are processed by the ESP8266, which then displays the information on a small OLED screen connected via I2C. This provides immediate, on-device feedback to the user, enhancing the usability of the system.
To ensure mobility and off-grid operation, the project is powered using a rechargeable 18650 Li-ion battery, with a TP4056 charging module handling the safe charging and discharging cycles. This battery-powered approach makes the project suitable for outdoor environments or areas with limited access to electricity.
All the components are connected using a breadboard and jumper wires, allowing for quick prototyping and testing without soldering. Resistors are used where necessary to ensure signal integrity and to protect sensitive components.
This setup is ideal for DIY enthusiasts, students, or developers interested in home automation, smart farming, or any application requiring remote environmental data. It is scalable, low-cost, and introduces core IoT concepts like sensing, data transmission, and remote access.
Additional information
| Component | Cost |
|---|---|
| 1 x ESP8266 NodeMCU Board | ₹250 – ₹350 |
| DHT11 / DHT22 Sensor | ₹50 – ₹200 |
| OLED Display (0.96) | ₹150 – ₹250 |
| Micro-USB Cable | ₹30 – ₹50 |
| Li-ion 18650 Battery | ₹100 – ₹200 |
| TP4056 Charging Module | ₹30 – ₹60 |
| Breadboard & Jumper Wires | ₹80 – ₹150 |
| Resistors (10k, 220Ω) | ₹10 – ₹30 (pack) |
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Whether you’re a novice eager to dive in or an experienced maker tackling your next big project, Elitetronics is your trusted partner for dependable hardware, expert advice, and transformative innovation.
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