DS18B20 Waterproof Digital Temperature Sensor Probe Waveshare #define sensorPin A0 // analog

#define sensorPin A0 // analog input pin for MQ-2 int sensorValue = 0

MQ 135 alcohol sensor is a Sno2 with a lower conductivity of clean air

The 4 X 4 Matrix Keypad (RM0947) is a very simple one from have 16 tactile keys connected to the male headers across the resisters on the same board

4inch TFT Display for Arduino UNO board compatible with Arduino

DS18B20 Waterproof Digital Temperature Sensor Probe Waveshare #define sensorPin A0 // analogDS18B20 Waterproof Digital Temperature Sensor Probe This is a pre wired and waterproofed version. Handy for when you need to measure something far away or in wet conditions. While the sensor is good up to 125C the cable is jacketed in PVC so we suggest keeping it under 100C. Because they are digital, you don't get any signal degradation even over long distances! These 1 wire digital temperature sensors are fairly precise and can give up to 12 bits of