guys i need help.. my relay doesnt change contacts...
i followed the tutorials in making a circuit with relay
i use a 5volts relay
bc548 npn transistor
1k resistor
and a diode parallel with the coil of relay...
the problem is... when i try to read the voltage readings across the relay it is only 1 or 2volts...
i also try putting a different transistor like ksp2222a... still i got the same results...
i connect the output of arduino series with a 1k resistor to base of transistor and emitter to ground and collector to coil of relay parallel with a diode then connected to 5volts supply from arduino...
help me pls