IoT Based Automated Table Lamp

The IoT-Based Automated Table Lamp system utilizes a distributed dual-microcontroller architecture to provide both automated presence detection and remote smartphone control. At the core of the system are two NodeMCU ESP8266 Wi-Fi development boards communicating over a wireless network. The first NodeMCU board interfaces with an infrared (IR) sensor module positioned near a chair. When a user sits on the chair, the IR sensor detects the physical presence and sends a digital signal to its local ESP8266. This board processes the state change and transmits a trigger signal via Wi-Fi to the second NodeMCU board. The second NodeMCU board controls a relay module acting as an electronic switch for the AC lamp. Upon receiving the trigger, it energizes the relay coil, closing the circuit to power on the AC lamp; when the user leaves the chair, the system reverses the process to turn the lamp off. Concurrently, the ESP8266 connects to the Blynk cloud platform, allowing users to override the automated state and manually toggle the lamp using the Blynk app on a smartphone. Additionally, the software environment incorporates bedtime alert logic to notify users when the lamp has remained active past a designated hour, promoting energy conservation. The entire low-voltage logic control circuit is prototyped using breadboards and jumper wires, while the relay module safely isolates the low-voltage NodeMCU electronics from the high-voltage AC mains powering the table lamp.