MQ135 Features – Sensitive material MQ135 gas sensor is used in clean air low conductivity tin oxide (SnO2). When the

MQ3 alcohol sensor Used to measure the level of alcohol in the air/breath or related work Operating voltage: DC 3-5V.

BMP180 Digital Barometric Sensor Module compatible with Arduino will Measure the absolute pressure of the environment using a digital barometer

Specifications Model: GY-271 – HW-246 ADC internal 12 bit Operating voltage: 2.16 to 3.6 volts Communicate with the I2C interface