Zombie Detector Gauge

Project

Build a zombie detector using a gas sensor and a servo motor.

The gas sensor measures changes in the air. The Arduino converts the sensor reading into a servo angle, moving the gauge between different danger levels.

Wires

Gas Sensor

Arduino Pin	Component	Component Pin
5V	Gas Sensor	VCC
GND	Gas Sensor	GND
A1	Gas Sensor	AO

Servo Motor

Arduino Pin	Component	Wire Color
5V	Servo	Red
GND	Servo	Brown or Black
D3	Servo	Orange, Yellow, or White

Code

#include <Servo.h>

Servo gauge;

void setup() {
  pinMode(A1, INPUT);

  Serial.begin(115200);

  gauge.attach(3);
}

void loop() {
  int readout = analogRead(A1);

  Serial.print("READOUT: ");
  Serial.println(readout);

  int angle = 180 - map(
    constrain(readout, 140, 170),
    140,
    170,
    0,
    180
  );

  Serial.print("ANGLE: ");
  Serial.println(angle);

  gauge.write(angle);

  delay(1000);
}

Try Changing the Code

Change the sensor range

constrain(readout, 140, 170)

Try making the numbers bigger or smaller to change how sensitive the detector is.

Change the speed

delay(1000);

Try:

delay(250);

or

delay(100);

to make the gauge update faster.

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