Sensor Guides
Pinout diagrams, specs, wiring tables, and working code for every common sensor — across Arduino, ESP32, and Raspberry Pi.
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Motion
A3144
Digital hall-effect switch for RPM counting and proximity.
HC SR501
Passive infrared motion sensor with adjustable sensitivity and time delay — ideal for security projects.
KY 040
Clickable rotary encoder with integrated push-button — perfect for menu navigation and volume control.
MPU-6050
The standard 6-axis IMU for balancing robots, drones, and orientation tracking — cheap and well-supported.
RCWL 0516
Microwave radar motion sensor that detects movement through walls, glass, and plastic enclosures.
Reed Switch
Simple, reliable open/close detection for DIY alarms.
TTP223
Touch-sensitive pad for replacing mechanical buttons — perfect for clean, sealed enclosures.
Electrical / Current
IMU / Accelerometer
Temperature & Humidity
AHT10
A tiny I2C sensor that packs temperature and humidity sensing into the smallest footprint possible.
DHT11
The most popular entry-level temperature and humidity sensor — cheap, simple, and widely supported.
DHT22
The upgrade pick for demanding projects — 4x better accuracy, wider range, and the same wiring as DHT11.
DS18B20
1-Wire waterproof probe for liquids, soil, and outdoor use.
SHT31
Lab-grade Sensirion sensor for precision climate logging.
Light
BH1750
I2C lux sensor that outputs calibrated light readings — no ADC or calibration required.
Flame Sensor
Infrared flame detector for early fire-alert projects.
LDR (Photoresistor)
The simplest way to make something react to darkness or bright light.
TSL2561
Dual-photodiode lux sensor with good accuracy across mixed lighting conditions.
Pressure & Altitude
BME280
Combined pressure, humidity, and temperature sensing — the go-to all-in-one environmental sensor.
BMP180
Barometric pressure and temperature sensor with excellent library support — a weather station staple.
BMP280
Precise barometric pressure and temperature sensing over I2C or SPI — ideal for weather stations.
MS5611
High-precision altimeter sensor used in drones and GPS units.
Identification / RFID
proximity
Distance
HC-SR04
The most reliable ultrasonic distance sensor — measure 2cm to 4m with just two GPIO pins.
JSN SR04T
Waterproof ultrasonic sensor for tank level measurement and outdoor robotics.
US 100
HC-SR04 alternative with temperature compensation and optional UART mode for better consistency.
VL53L0X
Laser ToF sensor with millimeter accuracy up to 2m.
