13MarMarch 13, 2026

ESP32 with DC Voltage Sensor

If you want to measure DC voltage using ESP32, this tutorial will guide you step-by-step. The ESP32 voltage sensor project is useful for monitoring battery voltage, power supply voltage, solar panels, and IoT power systems.In this guide, you will learn how to connect a DC voltage sensor to ESP32, understand the voltage divider principle, and run Arduino code to measure voltage accurately.What is an ESP32 Voltage Sensor?A DC voltage sensor module allows the ESP32 to measure voltages higher than 3.3V,...

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11MarMarch 11, 2026

INA219 Current Sensor with ESP32 – Measure Voltage, Current, and Power

If you are building an IoT power monitoring project, battery system, or power bank device, measuring current, voltage, and power accurately is very important. The INA219 Current Sensor Module is one of the best sensors for this purpose. In this project, we will focus on using the INA219 with ESP32.In this guide, you will learn how to interface the INA219 current sensor with ESP32, measure voltage and current, understand the circuit diagram, and run the complete Arduino code. This tutorial...

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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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