The Passive Infra Red (PIR) motion sensor… tucked anonymously away in the darkest corners of our homes, or cruelly exposed to blazing sun and biting cold alike in our gardens and driveways, patiently waiting for a visitor or intruder to come along so that it can carry out its life’s work. Often overlooked, yet always vigilant, the humble PIR has been ‘watching our backs’ for almost 40 years.
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