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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...

LM75 Temperature Sensor Features LM75 is a temperature sensor that can measure temperature range from -25 to +125 degrees Celsius. This sensor support I2C communication protocol and you can communicate with this module using two SDA and SCL pins to read the ambient temperature. You can download the datasheet of this module here. [wpdm_package id='17386'] LM75 Temperature Sensor Pinout This sensor has 5 pins:  VCC: Module power supply – 3.3-5 V  GND: Ground  SDA: Data pin...

KY-031 Knock Module Features This module is a spring-based sensor that sends a HIGH signal when a vibration is detected. It can be widely used in security systems, or monitoring. You can easily use it with the Arduino board or any other microcontroller. Tip It is recommended to use microcontroller interrupt pins in order to increase accuracy. You can download the datasheet of this module here. [wpdm_package id='17426'] KY-031 Knock Module Pinout This sensor has 3 pins:  VIN: Module power...

MPS20N0040D Pressure Module Features The MPS20N0040D Pressure and Altitude Sensor Module is an MPS20N0040D pressure sensor that receives altitude data and transmits it to the HX710 IC, which is an ADC converter. This module is used to measure the ambient pressure and the pressure difference of liquid levels. Note: This module does not support I2C communication. You can download the datasheet of this module here.[wpdm_package id='17459'] MPS20N0040D Pressure ...