07MarMarch 7, 2026

AJSR04M Waterproof Ultrasonic Sensor with ESP32 – Complete Guide for Water Level Monitoring

Ultrasonic sensors are widely used in IoT and automation projects for measuring distance and liquid levels. However, standard sensors like HC-SR04 are not suitable for humid or wet environments.This is where the AJSR04M Waterproof Ultrasonic Sensor becomes extremely useful.In this guide, we will learn how to connect the AJSR04M ultrasonic sensor with ESP32, understand how it works, and build a simple water level monitoring system using the NewPing library.This tutorial is ideal for makers, engineers, IoT developers, and students.What is...

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04MarMarch 4, 2026

ESP32 HW-138 TTP224 4 Touch Control System for Smart Automation

The ESP32 HW-138 4 Touch Control System is a modern capacitive touch-based control solution that replaces traditional mechanical switches. Using the HW-138 4-touch pad module, you can control multiple devices such as LEDs, buzzers, relays, or motors with simple finger touch input.This project is ideal for smart home systems, industrial control panels, and IoT-based automation projects.What is HW-138 4 Touch Module?The HW-138 module is a 4-channel capacitive touch sensor board based on the TTP224 IC.It provides four independent touch pads,...

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04MarMarch 4, 2026

ESP32 YL-99 Limit Switch Safety System

The ESP32 YL-99 Limit Switch Safety System is a reliable solution for detecting mechanical limits in machines. The YL-99 module is a compact limit switch board that includes a mechanical switch and interface pins, making it easy to connect with microcontrollers like the ESP32.This project helps prevent motor overtravel, machine damage, and mechanical failure in automation systems.What is YL-99 Limit Switch?The YL-99 Limit Switch Module is a mechanical micro-switch mounted on a PCB with 3 pins:VCCGNDOUTIt works as a digital...

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04MarMarch 4, 2026

ESP32 Inductive Proximity Sensor Metal Detection Project

The ESP32 Inductive Proximity Sensor Metal Detection project is a simple and powerful way to detect metallic objects using an ESP32 microcontroller. Inductive proximity sensors are widely used in industrial automation, object detection systems, and manufacturing units for reliable metal detection without physical contact.In this tutorial, you will learn how to interface an inductive proximity sensor with ESP32, understand how metal detection works, and run a simple program to detect metallic objects using the Serial Monitor.What is an Inductive Proximity...

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02MarMarch 2, 2026

ESP32 Hall Effect Sensor A3144–Magnetic Field Detection Project

ESP32 Hall Effect Sensor A3144 is a simple and powerful combination used to detect magnetic fields in electronics and IoT projects. By interfacing the A3144 Hall Effect sensor with an ESP32 microcontroller, we can easily detect the presence of a magnet and trigger actions such as counting rotations, monitoring speed, or activating alarms.In this tutorial, we will learn how to connect the A3144 Hall Effect sensor with ESP32, understand how it works, and write a simple program to detect magnetic...

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