Quantity   Component name
1 × Arduino Nano 3.0 Atmega328 Controller
1 × ESP-01S ESP8266 serial WIFI
1 × MH-Z19 (CO2 sensor)
1 × BME280 5V sensor
1 × DS3231 (real-time clock)
1 × MB102 Breadboard Power Supply Module
1 × CD74HC4067 ADC MUX
1 × MQ-4 MQ4 gas methane sensor module
1 × MQ-136 gas sensor
1 × MQ-135 gas sensor
1 × CJMCU-1100 formaldehyde benzene sensor
1 × TTP223 Touch Key Switch Module
1 × 7Pin128X64 OLED Display Module
3 × IRF520N mosfet
9 × Resistors
1 × PCB