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DollaTek 5Pcs NE555 12V DC Adjustable 0-10 Second Timer Delay Relay Switch Module Shield for Arduino Raspberry Pi : Amazon.co.uk: DIY & Tools
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ARCELI 2 PCS NE555 12V DC Adjustable 0-10 Second Timer Delay Relay Switch Module Shield for Raspberry Pi : Amazon.co.uk: Automotive
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Omzlo: The PiWatcher
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