ESP32 with ZMPT101B Voltage Sensor – Complete AC Voltage Measurement Guide (2026)

IntroductionMeasuring AC voltage using ESP32 is a common requirement in IoT, energy monitoring, and automation projects. In this guide, we explain how to use the ZMPT101B AC voltage sensor with ESP32 to accurately measure AC voltage measurement with ESP32 using Arduino IDE. This tutorial is ideal for students, hobbyists, and IoT learners in India working on real-world electronics projects.Understanding AC voltage measurement with ESP32 can greatly enhance your IoT projects.👨‍🎓 Who Should Use This...

ESP32: Guide for DS3231 Real Time Clock Module

⏰ What is DS1307 RTC?The DS1307 is a real-time clock IC by Maxim Integrated that keeps track of:SecondsMinutesHours (12 or 24-hour mode)Day, Date, Month, YearAutomatically adjusts for leap years✅ It communicates with microcontrollers using SPI (Serial Peripheral Interface) — unlike the more common DS1307, which uses I2C.🔍 Key FeaturesFeatureDetailsInterfaceSPIVoltage2.0V – 5.5VTimekeepingSeconds, Minutes, Hours, Day, DateBattery backupYes (CR1220 or CR2032 coin cell)OscillatorRequires external 32.768 kHz crystalAlarm + Square WaveBuilt-in (configurable)🧰 Components RequiredComponentDescriptionESP32 boardMicrocontrollerDS1306 RTC moduleWith CR2032 battery and SPI pinsJumper wiresMale-to-female preferredBreadboardFor clean prototypingArduino IDETo program ESP32🔌 DS1307 to ESP32 Wiring...