16DecDecember 16, 2025

Digital Temperature Monitoring: ESP32 + DS18B20 Sensor System

🌡️ What is DS18B20?The DS18B20 is a digital temperature sensor from Maxim Integrated (now Analog Devices), known for:✅ Accurate temperature readings✅ Unique 64-bit serial code (for multiple sensors on one wire)✅ 1-Wire interface (needs only 1 data line + GND + VCC)✅ Waterproof versions available📋 Key FeaturesFeatureDescriptionTemperature Range-55°C to +125°CAccuracy±0.5°C (from -10°C to +85°C)Interface1-Wire digitalResolutionProgrammable: 9 to 12 bitsVoltage3.0V to 5.5VID AddressEach sensor has a unique ID🧰 Components UsedComponentDescriptionESP32 Dev BoardMicrocontrollerDS18B20 SensorWaterproof or standard TO-92 version4.7kΩ ResistorPull-up resistor for 1-WireJumper WiresFor connectionsBreadboard (opt.)For prototyping🔌 DS18B20 Pinout...

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16DecDecember 16, 2025

DFPlayer Mini with Esp32

🎵 What is DFPlayer Mini?The DFPlayer Mini is a tiny, standalone MP3 audio player module. It can play audio files (MP3/WAV) stored on a microSD card. You can control it through:Serial communication (UART with ESP32 or Arduino)Built-in IO pins (for button-triggered audio)Library-based commands to control volume, play/pause, next, loop, etc.📦 DFPlayer Mini PinoutPinFunctionVCCPower (3.2V–5V)GNDGroundTXSerial Transmit (connect to ESP32 RX)RXSerial Receive (connect to ESP32 TX)SPK1, SPK2Speaker output (mono, 3W)DAC_L/RStereo line out (for headphones/amp)IO1/IO2Button controlBUSYLOW when playing🔌 Wiring DFPlayer Mini with ESP32🔧 ESP32 to DFPlayer Mini (Serial Connection):DFPlayer PinESP32...

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16DecDecember 16, 2025

ESP-NOW with ESP32

📌 What is ESP-NOW?ESP-NOW is a wireless communication protocol developed by Espressif, allowing ESP32 boards to send and receive data directly without Wi-Fi or internet.🧠 Key Features📡 Peer-to-peer communication (up to 20 devices)⚡ Low power and fast (few milliseconds delay)🔐 Encrypted data transmission🚫 No Wi-Fi router or internet needed🔁 Bi-directional communication supported🔌 Where to Use (Use Cases)🎮 Wireless joystick controller🏠 Smart home automation🚨 Personal safety devices (like Safeguard+)🌱 Remote environment sensors🚗 Vehicle-to-vehicle communication🎓 College projects requiring mesh or local network🛠️ Components Needed✅ 2x...

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16DecDecember 16, 2025

ESP32 with Dot Matrix Display (MAX7219)

📌 What is the Dot Matrix Display with MAX7219?A Dot Matrix Display is an arrangement of LEDs in a grid (commonly 8x8) used to display text, symbols, numbers, or animations. When combined with the MAX7219 driver chip, it becomes much easier to control multiple displays using just 3 wires (SPI) from the ESP32.🧠 Key Features of Dot Matrix with MAX7219FeatureDetailsDisplay TypeLED Dot Matrix (8x8 per module)Module DriverMAX7219InterfaceSPI-compatible (DIN, CLK, CS)Voltage5V (logic safe for ESP32)CascadableYes (multiple modules side-by-side)Control LibraryMD_Parola / MD_MAX72xxBrightness ControlYes (adjustable via software)⚙️ Pinout of...

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16DecDecember 16, 2025

Motion Detected: ESP32 with PIR Sensor (HC-SR501)

🧠 What is a PIR Sensor?PIR = Passive Infrared SensorA PIR sensor detects motion by measuring changes in infrared radiation.Every warm object (like humans and animals) emits infrared (IR) radiation.PIR sensors don’t emit anything; they only detect IR changes. That’s why they are called passive.🧪 How Does It Work?The PIR sensor has two slots made of pyroelectric sensors.When a human or animal moves in front of the sensor, one slot sees more IR radiation than the other.This sudden change causes a voltage difference and the sensor outputs HIGH (3.3V or 5V) for a short...

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