Build a dual NRF24L01 ESP32 Bluetooth jammer from scratch. Full circuit diagram, pin connections, firmware flashing & video demo. Educational RF project for makers & engineers.
Read more »ESP32 Bluetooth Jammer with NRF24L01 – DIY Build Guide
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SU-03T Offline Voice Recognition Module Setup Guide
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Build an offline voice recognition system using the low-cost SU-03T module. Full wiring, SDK setup & firmware flash guide. The SU-03T is the cheapest alternative to the VC-02 offline voice module
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Smart Grid in IoT: Build with Arduino UNO R4 & PZEM-004T
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Build a smart grid IoT system using Arduino UNO R4 WiFi and PZEM-004T to monitor voltage, current, power, and energy with real-time cloud tracking.
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ESP32-CAM WhatsApp: Send Images Instantly via IoT
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Learn how to build an ESP32-CAM WhatsApp system that captures and sends images in seconds using CircuitDigest Cloud API. No GSM needed. Full code, circuit diagram & GitHub included.
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Real-Time Hand Gesture Control Robot Using OpenCV and Arduino
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Build a real-time hand gesture control robot using OpenCV, MediaPipe, Arduino Nano & nRF24L01. Complete project source code, circuit diagrams, and step-by-step guide.
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DIY ESP32 Speaking Alarm Clock with AI Voice & Wi-Fi
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Build a smart ESP32 speaking alarm clock using XIAO ESP32-S3, Wit.ai TTS & MAX98357A. Announces time & custom messages aloud. Step-by-step wiring, code & web UI guide.
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DIY Handheld Arduino Game Console Full Build Guide 10 Games
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Build a pocket-sized Arduino game console with 10 arcade games, Snake, Tetris, Pacman & more. Full wiring diagram, Arduino code & step-by-step assembly guide included.
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Optocoupler Tester Circuit: Build, Test & Troubleshoot
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Build a simple DIY optocoupler tester circuit with two LEDs and a 3.7V battery. Test 4-pin and 6-pin optocouplers instantly, no instruments needed. Full diagram included.
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Adding WiFi Camera to LiteWing ESP32 Drone – Guide
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Add a WiFi camera module to your LiteWing ESP32 drone for real-time aerial video streaming. Step-by-step wiring, mobile setup, and troubleshooting guide for hobbyists.
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DC Motor Speed Control Using GSM and Arduino - Full Guide
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Learn how to build a DC motor speed control using GSM and Arduino. Send SMS commands to control forward, reverse, and speed of a DC motor using SIM800L and L298N motor driver. Includes circuit diagram, code, and pinout.
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Arduino Water Level Sensor Tutorial - How Water Level Sensor Works
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In this tutorial, we are going to interface a water level sensor with an Arduino to measure the water level and in the process, we will let you know the details about this sensor and its working.
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DIY Power Bank Circuit Diagram: How to Make a Power Bank Circuit
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How to make a power bank? Here is the complete DIY tutorial with a power bank circuit diagram using a 18650 lithium battery, a TP4056 module, and a boost converter.
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Voltage Controlled Oscillator (VCO): Basics,Working Principle & Types
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A Voltage Controlled Oscillator is an oscillator which produces oscillating signals (waveforms) with variable frequency. The frequency of this waveform is varied by varying the magnitude of the Input voltage.
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Three Phase Inverter Circuit
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In this article, we will discuss 3 Phase Inverter Circuit which is used as DC to 3 phase AC converter. Do remember that, even in the modern days achieving a completely sinusoidal waveform for varying loads is extremely difficult and is not practical. So here we will discuss the working of an ideal three-phase converter circuit neglecting all the issues related to practical 3 phase inverter.
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Fire Alarm Circuit using Thermistor and 555 Timer
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This project covers a simple fire alarm circuit using a thermistor and a 555 timer IC. Here, a thermistor is used as a fire detector. A thermistor is a temperature-sensitive resistor whose resistance changes with temperature: it decreases as temperature increases and vice versa.
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ESP32-CAM Face Recognition Door Lock System using Solenoid Lock
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Learn how to build a Face ID-controlled digital door lock using ESP32-CAM, relay module, and solenoid lock. Step-by-step guide with circuit diagram, Arduino IDE setup, and full code for a secure IoT-based access system.
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Overcurrent Protection Circuit using Op-Amp
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This circuit will have an adjustable overcurrent threshold and an Auto-restart on failure feature. As this is an op-amp-based overcurrent protection circuit, it will have an op-amp as the driving unit.
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DIY WiFi-Controlled Drone with ESP32 and Arduino
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Learn how to build a WiFi-controlled drone using ESP32 modules and MPU6050 IMU. This DIY project offers stability control, smartphone control, and easy upgradability. Get step-by-step instructions and a complete circuit diagram.
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RC Phase Shift Oscillator Circuit using Op-Amp
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An RC Phase Shift Oscillator is an electronic oscillator circuit which produces a sine wave output. It can either be designed by using a transistor or by using an Op-amp as an inverting amplifier.
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Arduino SD Card Module: Understanding and Interfacing
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Learn how to connect a micro SD card module to Arduino step by step. This beginner-friendly guide covers wiring, SPI communication, code for reading and writing files, and practical data logging applications.
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