"Don't Buy" PIR Sensors

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More PIR advice from Rob….

The UK consumer magazine Which? has a “don’t buy” advisory that it slaps on really poor products. I think I’ll have a go at that. I rate these HC-SR505 PIR sensors as a don’t buy. I got them thinking they would work as well as the HC-SR501 sensors that I’m using for my “Connected Little Boxes”. It turns out that they are a bad bet for two reasons.

  1. When they detect a person they hold that signal for around 13 seconds before releasing it. The timeout of the HC-SR501 can be adjusted and it has two different detection modes which are much more flexible.

  2. They stop working after a few hours.

Definite don’t buy.