7

ENVIRONMENTAL MONITORING

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Zombies are pretty frightening, but they’re not the only threat in a postapocalyptic world. More mundane risks like fire are especially serious if you can’t safely leave your compound (see Figure 7-1). In this chapter, I’ll show you how to build a fire alarm and a temperature alarm that alert you to environmental hazards—without alerting the zombies.

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Figure 7-1: No smoking!

PROJECT 11: QUIET FIRE ALARM

Normally, you want a fire alarm to be as close to you as possible and as noisy as possible. But there’s one problem with ...

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