Sensors DHT11 Temperature & Humidity Sensor Digital temperature and humidity sensor: 0-50°C (±2°C) and 20-80% RH (±5%), single-wire output, 1 reading/seco Contact for price
Sensors DHT22 Temperature & Humidity Sensor Higher-accuracy sibling of the DHT11: -40 to 80°C (±0.5°C) and 0-100% RH (±2-5%). Same single-wire protocol an Contact for price
Sensors DS18B20 Waterproof Temperature Sensor 1-Wire digital temperature probe in a sealed stainless steel tip, -55 to 125°C, ±0.5°C between -10 and 85°C. M Contact for price
Sensors HC-SR04 Ultrasonic Distance Sensor Ultrasonic ranger measuring 2cm to 400cm with roughly 3mm resolution over a 15° cone. Trigger/echo interface, Contact for price
Sensors HC-SR501 PIR Motion Sensor Passive infrared motion detector with up to 7m range and a ~110° cone. Onboard trimmers set sensitivity and ou Contact for price
Sensors MQ-2 Gas & Smoke Sensor Detects LPG, propane, methane, hydrogen, alcohol and smoke from roughly 300-10000ppm. Provides both analog and Contact for price
Sensors MQ-135 Air Quality Sensor Broad air-quality sensor responding to ammonia, NOx, benzene, smoke and CO2. Analog plus adjustable digital ou Contact for price
Sensors Soil Moisture Sensor Measures soil water content by resistance between two probes, with an LM393 comparator board giving analog and Contact for price
Sensors LDR Light Sensor Module Light-dependent resistor on a comparator board: analog brightness plus an adjustable digital trigger. Used for Contact for price
Sensors IR Obstacle Avoidance Sensor Infrared emitter/receiver pair with an adjustable detection range of roughly 2-30cm. Outputs digital LOW on ob Contact for price
Sensors MPU-6050 Accelerometer + Gyroscope 6-axis inertial measurement unit: 3-axis accelerometer and 3-axis gyroscope with an onboard DMP, read over I2C Contact for price
Sensors HX711 Load Cell Amplifier 24-bit ADC built for strain-gauge load cells, giving stable gram-level weight readings over a simple 2-wire in Contact for price
Sensors BMP280 Barometric Pressure Sensor Precision barometric pressure and temperature sensor, 300-1100 hPa, readable over I2C or SPI. Pressure resolve Contact for price
Sensors Flame Sensor Module Detects infrared light in the 760-1100nm band given off by flame, out to about 80cm within a 60° cone. Analog Contact for price
Sensors Rain Drop Sensor Module Exposed conductive-trace plate plus comparator board that detects water landing on the surface. Analog wetness Contact for price
Sensors Water Level Sensor Series of parallel conductive traces that report how deep they are submerged as an analog value. Simple and ch Contact for price