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DHT11 Temperature And Humidity Sensor Module with LEDFeatures-DHT11 sensor with PCB and LED indicator along with cable; 3 to 5V power and I/O, 4 pins with 0.1″ spacingThe board has a pre-built 4.7K or 10K resistor, which you will need to use as a pull-up from the data pin to VCC.2.5mA max current us..

MQ-3 Alcohol Detector Gas Sensor ModuleFeatures-Signal output light indicator.Analog and level signal output.TTL output valid signal is low.  (When the output low signal light can be directly connected to microcontroller or relay module).The carbon monoxide detection with better sensitivity.It ..

SN04-N NPN NO 5mm Distance Detector Proximity Sensor Switch ModuleFeatures-Red LED checks the state of the proximity sensorHigh repeated positioning accuracyHigh switching frequencyWide voltage rangeAntivibration, dust, water, and oil preventionReverse power protection, short circuit protection, dir..