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Web-Based Pool Controller W/ Raspberry Pi, Arduino, Xbee and Digital Thermometer : 8 Steps (with Pictures) - Instructables
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reef-pi :: An opensource reef tank controller based on Raspberry Pi. | REEF2REEF Saltwater and Reef Aquarium Forum
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Built a pool controller for ~$300, controlled using home assistant, mqtt, and node-red. : r/raspberry_pi
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