I have 3 pin led green-red common cathode.
I want the green to be power indicator only and when the sensor siren is triggered i want the red led to turn on and green off.
At the present circuit when the sensor siren is triggered i am getting both red and green led on making the orange led.
Please reply with schematic if possible. Thanks.

 

Drive the green LED with a PNP transistor like 2N2906 with a 1k1 current limit R, Base 9k in series with 1k to ground. Cathode to +12 V. Connect motion sensor to junction. Connect red LED in series with 820 R between junction & ground.
Sorry, scanner down-still. You might draw it out & corrections can be made if necessary.

 

Drive the green LED with a NPN transistor like 2N2906 with a 1k1 current limit R, Base 9k in series with 1k to ground. Connect motion sensor to junction. Connect red LED in series with 820 R between junction & ground.
Sorry, scanner down-still.

Thank you Bernard but i can’t understand but i can read the schematic, would appreciate if u can draw the circuit. Sorry about that i am new at electronics..

 

This will have to do for now.

 

Here is another example of what Bernard is getting at:


R1 and R2 are chosen based on your LED.V2 just simulates your switch. Q1 is just a common PNP switching transistor. The circuit is a very common off the shelf circuit. It should do what you are looking to do.

Ron

 

Here is another example of what Bernard is getting at:
View attachment 157091

R1 and R2 are chosen based on your LED.V2 just simulates your switch. Q1 is just a common PNP switching transistor. The circuit is a very common off the shelf circuit. It should do what you are looking to do.

Ron

Thanks Ron, will try it and let u known.

 

This will have to do for now. View attachment 157088

Thank you, I really appreciate it. Will try it and let u know

 

Thanks Ron, will try it and let u known.

Working great i need just to play around finding best size of Resistors for leds. Thanks.

 

Thank you, I really appreciate it. Will try it and let u know

Working great i need just to play around finding best size of Resistors for leds. Thanks.

 

Glad it worked for you.

Ron