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When this unit is first powered, the output will be high for two seconds before switching to low. This is followed by eight seconds of self-testing during which the sensor will not trigger. The through-hole labelled 3V3 provides 3.3 V from the integrated regulator.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.