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Build Your Own Timer Plug – Automatic Mobile Charger Cut-Off Using ESP32 (Hotspot Mode)

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Build Your Own Timer Plug – Automatic Mobile Charger Cut-Off Using ESP32 (Hotspot Mode) By Dinesh D | DIY Electronics & Tech Projects | Nov 2025 ⭐ Introduction Mobile batteries degrade over time, especially when overcharged overnight. While commercial timer plugs exist, they are often costly and lack flexibility. In this project, you will learn how to build a custom automatic timer plug using an ESP32 and a relay module. This timer plug switches OFF your charger automatically after a set duration — and the best part? It works completely offline. No router. No internet. Only ESP32 hotspot mode. The ESP32 creates its own WiFi Access Point. Once you connect your smartphone to it, you can open a simple webpage, enter the timer (HH:MM:SS), and the relay will turn OFF automatically when the time completes. This is a perfect beginner-friendly IoT project with real-world usefulness.          🧠 How the Timer Plug Works The ESP32 is programmed in Access Poi...
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🎯 Build Your Own RFID Attendance System Using Arduino + ESP32 + Google Sheets

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  🎯 Build Your Own RFID Attendance System Using Arduino + ESP32 + Google Sheets 📅 By Dinesh | Tech DIY Projects | May 2025     🚀 Introduction Have you ever wanted to build a smart attendance system that logs student or staff attendance directly into Google Sheets in real time? In this tutorial, I’ll show you how I created a WiFi-connected RFID attendance system using: ✅ Arduino UNO (for RFID + DFPlayer) ✅ ESP32 (for WiFi + Google Sheet logging) ✅ Google Apps Script (to act as a cloud database) Let’s dive in! 🧠 Project Concept Here’s how the system works: User scans an RFID card . Arduino detects the card, plays a welcome sound using DFPlayer, and sends the name to ESP32. ESP32 receives the name via serial and logs it to a Google Sheet using a webhook . Done! The name and timestamp are saved in the cloud. 🧰 Components Used Component Quantity Arduino UNO 1 ESP32 (DevKit v1) 1 MFRC522 RFID Reader 1 RFID Tags/Cards 2+ DFPlayer Min...
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🌞 DIY Arduino Solar Tracker with Motor Control – Complete Guide

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  🌞 DIY Arduino Solar Tracker with Motor Control – Complete Guide 🔧 Overview: This project uses Light Dependent Resistors (LDRs) to track the sun's position and adjust the orientation of a solar panel using two servo motors . Additionally, based on the sunlight intensity, it controls a motor using two buttons – ideal for automating a solar-powered device like a water pump. 🧰 Components Required: Component Quantity Description Arduino Uno 1 Microcontroller board Servo Motor (SG90/MG90) 2 For horizontal and vertical rotation LDR (Light Sensor) 5 For detecting sunlight intensity and direction 10kΩ Resistors 5 Pull-down resistors for each LDR Push Buttons 2 For controlling motor direction DC Motor 1 Can be used for pumping or rotation purposes NPN Transistor (optional) 1 For driving higher power motors Diode (1N4007) 1 For back EMF protection Power Supply (9V/12V) 1 To power the motor       Breadboard + Jumper Wires            ...
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🚗 Driver Drowsiness and Alcohol Detection System Using Arduino & GSM Module

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🚗 Driver Drowsiness and Alcohol Detection System Using Arduino & GSM Module Published on: April 18, 2025 Author: Dinesh | Learn with D Trend Introduction Road safety is a paramount concern in today's fast-paced world. Accidents resulting from driver fatigue and alcohol consumption are alarmingly common. To address this issue, I've developed a Driver Drowsiness and Alcohol Detection System using Arduino and a GSM module. This project aims to enhance vehicular safety by monitoring the driver's alertness and sobriety, providing real-time alerts, and taking preventive actions when necessary. Objectives Monitor Driver Alertness: Detect prolonged eye closure indicating drowsiness. Detect Alcohol Consumption: Identify the presence of alcohol in the driver's breath. Automated Alerts: Send SMS notifications to a predefined contact upon detection. Preventive Measures: Disable the vehicle's motor to prevent potential accidents. Components Requ...
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