I try to explain again.
I'm trying to activate a relay from the output of Arduino UNO
The relay is 12 Volts and I have other of 9 volts. The transistror I use is a 2N222A and I do not know that put in emitter resistor
I've tried everything and no way to activate the relay coil . If is activated, then there is no way to disable
The program with leds works correctly.
Someone has the outline of a circuit to do this.
thank you very much