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HTU21D Sensor Features The HTU21D is a digital humidity and temperature sensor. It uses I2C communication and there are 2 SCL and SDA pins that are needed to be hooked up in order to communicate to this sensor. This sensor is ideal for temperature and humidity sensing. Humidity measuring range: 0-100% RH°/ Accuracy ±2% Temperature measurement range: -40 ° +125 °/ Accuracy ±0.3C You can download the datasheet of this module here.  [wpdm_package id='17292'] HTU21D Sensor Pinout Thi...

801S Vibration Module Features The 801S vibration sensor module has a digital output pin that gives HIGH output by detecting vibration up to a certain threshold. The sensitivity of this sensor can be adjusted with a potentiometer on the module. The IC on this module is LM358. This module can be used in security systems. Note The module's sensitivity is very high. You can download the datasheet of this module here. [wpdm_package id='17349'] 801S Vibration Module Pinout This sensor has 3 pins: ...

GY-21P Module Features The GY-21P module consists of two sensors, BMP280 and SI7021, which include pressure, temperature and humidity sensors. The communication protocol of this module is I2C. This module is capable of measuring air pressure from 30,000Pa to 110,000Pa, measuring humidity from 0 to 100%, measuring altitude from 0 to 30,000 feet and measuring temperature from -40 to +85 degrees Celsius. You can download the datasheet of this module here. [wpdm_package id='17363'] [wpdm_package ...

IR Flame Sensor Features The flame sensor is actually an infrared receiver. In this module, the output of the infrared receiver is measured using a comparator IC. If the fire and flame (or any other infrared source) is close to the sensor, the output of the comparator is LOW, otherwise the output is HIGH. Note There is a potentiometer on board to change the sensor's sensitivity. In practice, this potentiometer changes the reference voltage of the comparator IC (the same voltage that the sensor voltage is co...