The Water Level Indicator Kit consisting of 6 sensing probes that are dipped in water to sense the level of water. Probe A is connected as common to the other five, which should be at the bottom-most part of the water tank, also act as a reference level. The probes B, C, D, E, and F are set as levels. Mount it inside your home with the indicator LEDs pointing out of the box. A short length five, wires can be used as sensing probes and for common sensor Probe A. When the water in the tank touches probes A and B both, a small current flows from A to B through water and to the base of transistor T1.

Type READY MADE ASSEMBLED
Usage/Application Electronics Hobby Kits For science fair
Minimum Order Quantity 1 Piece

During our journey through train and bus, we carry many important things and all the time we have fear that someone might lift our luggage. So to protect our baggage, we normally lock our baggage through old ways by the help of chain and lock. After all locks, we still remain in fear that someone may slash the chain and take away our valuable material. To overcome with these fear, here is an easy circuit which is based on the NAND gate. In this circuit, when someone tries to lift your luggage, it will generate a warning alarm which is very much helpful during your travel in the bus or train even at the night time as it can also produces audio visual indication attached to the relay.