Arduino Servo Motor Control, Gas Detection, and DHT11 Sensor Data Display

This code controls a servo motor and a gas sensor (MQ2) using an Arduino board. The first part initializes pins and variables: setting the touch pin and buzzer pin as inputs, the servo pin as output, serial communication, and attaching the servo.

The loop function reads the touch sensor value and controls the servo accordingly. If the touch sensor is pressed (HIGH value), the servo rotates to 90 degrees. If not pressed (LOW value), it rotates to 0 degrees.

Next, the code reads the MQ2 sensor value, converts it to voltage, and triggers the buzzer if the voltage exceeds a threshold (1 second on, 1 second off). Finally, it outputs the sensor value and voltage through serial communication and waits for 1 second.

The second part uses a DHT11 temperature and humidity sensor to display data on an LCD screen. It initializes the LCD and DHT11 sensor pin.

The loop function reads sensor data from the DHT11 and displays it on the LCD screen. It also outputs the data through serial communication.

Overall, this code controls a servo based on touch sensor input, detects gas using an MQ2 sensor, and displays temperature and humidity data on an LCD screen using a DHT11 sensor.