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NE555 + CD4017 Water Flowing Light LED Module DIY Kit MQ 135 Gas Sensor Module For NH3 2inch Flex Sensor 2inch Flex Sensor 7kOhm 10kOhm pull up resistor to VCC Pin 3 NC Not connected (leave floating) Pin 4 GND Ground Project Ideas You can use any color LEDs (Red Express options available for urgent orders
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