A water level indicator is used to indicate the level of water in an over head tank. This keeps the user informed about the water level at all times and avoids the situation of water running overflow. Four LEDs to indicate the 4 Â different water...
 Dancing LED Using 555 DIY Kits (Not Soldered) Astable Multivibrator circuit is a simple multivibrator which has no stable state. It has two LED, which will flashing with a time period. NE555 oscillator is used for generating the free running...