How to make water level indicator with alarm using cardboard - Science project
Using item
---------------
Cardboard
9V Battery
Buzzer
Switch
Green LED
Yellow LED
Red LED
Wire
BC 547 Transistor
220 Ohm Resistor
00:19 Starting
00:23 Water Level Circuit
00:42 547 Transistor , 220 Ohm Resistor , LED Connection
02:28 Set the cardboard
06:10 Buzzer Connect
07:37 Battery Switch Connect
11:14 Bottle set the cardboard
14:12 Ready
#cardboard #waterlevelindicator #punnakalatech
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