WINGONEER 2PCS MQ-7 MQ7 Carbon Monoxide Detection Sensor Module CO Gas Sensor Module

WINGONEER 2PCS MQ-5 Combustible Gas Propane/Butane Detector Sensor Module

C.J. SHOP® 5PCS MQ-2 MQ2 Smoke Gas LPG Butane Methane Sensor Detector Module For Arduino

Gowoops 2 PCS DHT22 Temperature Humidity Sensor Module Digital Measurement for Arduino Raspberry Pi 2 3

WINGONEER 2PCS Arduino Compatible Mini MQ-4 Gas Sensor

HiLetgo ADS1115 16 Bit 16 Byte 4 Channel I2C IIC Analog-to-Digital ADC PGA Converter with Programmable Gain Amplifier High precision ADC Converter Development Board for Arduino Raspberry Pi

ELEGOO for Arduino Nano V3.0, Nano Board CH340/ATmega328P Without USB Cable, Compatible with Arduino Nano V3.0 (Nano x 3 Without Cable)

Aideepen 3pcs MQ135 MQ-135 Air Quality Sensor Hazardous Gas Detection Module for Arduino

HiLetgo® MQ-135 MQ135 Air Quality Sensor Hazardous Gas Detection Module For Arduino AVR

ELEGOO 32 Pcs Double Sided PCB Board Prototype Kit for DIY Soldering with 5 Sizes Compatible with Arduino Kits

Microchip MCP3008-I/P 10-Bit ADC with SPI (Pack of 4)