11Gas and Smoke Alarm
In this project, you’ll build a gas and smoke alarm using an MQ-2 gas and smoke sensor and a piezo buzzer. Every time the sensor detects gas or smoke in the atmosphere above a certain threshold, the buzzer will sound.
PARTS REQUIRED
Raspberry Pi
Breadboard
MQ-2 gas and smoke sensor
MCP 3008 chip
Piezo buzzer
5 mm LED
330 Ω resistor
Pushbut ton
Lighter
Jumper wires
INTRODUCING THE MQ-2 GAS AND SMOKE SENSOR
The MQ-2 gas and smoke sensor is sensitive to smoke and the following flammable gases: propane, butane, methane, alcohol, and hydrogen. Figure 11-1 shows the sensor’s front and back views.
FIGURE 11-1: The MQ-2 gas and ...
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