Water pump automatic on off

332

07:39:18

Bulb= water pump
NPN transistor 2n2222
Diode 1n007
Resistor 100 ohm to the base
Relay 6vdc
Closed switch when sank in water
Opened switch when didnt sink in water....

published 6 years ago

PrathikP

6 years ago

You must flip the emitter and collector of the transistor. And makes this automatic?

circuitraza

6 years ago

You can test it with both

BillyT

6 years ago

The basic idea behind this circuit has merit, check the AC voltage levels. As PrathikP says the transistor is wired back to front and if wired correctly the diode needs reversing. The base resistor could be larger than the selected device, and a pull down resistor would ensure positive relay drop out. A 12V relay nominally pulls in at around 6V and drop out at about 5V, check specs for coil resistance etc. http://everycircuit.com/circuit/5081276072329216

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