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Lens: 10x6x13mm (LxBxH) / Black / Rectangular; Model: TSOP 1738 Able to transfer data continuously up to 2400bps; Immunity against ambient light Supply Voltage : 4.5 - 5.5V; CMOS and TTL Compatible; The sensor only detects and response to the 38 KHz IR ray incident directly on to it. The sensor has inbuilt embedded preamplifier circuit with automatic gain controller along with bandpass filter. Package Include 1 x TSOP LED

A float switch is a device used to sense the level of liquid within a tank, it may actuate a pump, an indicator, an alarm, or other device.

A float switch is a device used to sense the level of liquid within a tank. The switch may actuate a pump, an indicator, an alarm, or other device. Use them with hydroponics, saltwater tank, freshwater tank, gardening, aquariums for power head control, pet bowls, fish tanks, filtration, heating, pumps, ponds, basement alarms, boats, air condition drain pans, pressure washers, carpet cleaning mach, reef aquarium, fluid control, ice machines, coffee pots, marine, automotive, automobiles, tropical fish tanks, evaporator coils, condensation line, in relays, or whatever your project may be. It can be easily converted from normally open to normally close by inverting the float.

This YF-S201 1/2 inch Water flow sensor consists of a black plastic valve body, a water rotor and a hall effect sensor. 1-30 Litre/min Water can flow through this sensor. This YF-S201 is placed in line with water and its pinwheel sensor detects how much liquid has flowed through it. With every pinwheel revolution magnetic hall effect sensor generate an electrical pulse which is fed to the controller and thus controller is able to detect how much liquid is flowing through the sensor at any point of time. The hall effect sensor is sealed from the liquid pipe and thus remains protected from the water. 

The Electrical pulse generated by the sensor is approximately equal to 2.25 milliliters. So by counting the number of pulse we can easily calculate the amount of water flowing through the sensor. 

This YF-S201 1/2 inch Water flow sensor consists of a black plastic valve body, a water rotor and a hall effect sensor. 1-30 Litre/min Water can flow through this sensor. This YF-S201 is placed in line with water and its pinwheel sensor detects how much liquid has flowed through it. With every pinwheel revolution magnetic hall effect sensor generate an electrical pulse which is fed to the controller and thus controller is able to detect how much liquid is flowing through the sensor at any point of time. The hall effect sensor is sealed from the liquid pipe and thus remains protected from the water. 

The Electrical pulse generated by the sensor is approximately equal to 2.25 milliliters. So by counting the number of pulse we can easily calculate the amount of water flowing through the sensor. 

The YF-S201 comes with three wires: Red/VCC (5V-18V) DC Input, Black/GND and Yellow which is for the Pulse Output. Connect the Red wire with the VCC of your controller, Black with Ground and Yellow wire with any digital pin which can also handle the interrupts. As soon as the liquid start flowing through the sensor, it generates digital pulse proportionally. With the help of counters and interrupts you can measure the liquid flow rate.