Hi, im doing a project on electric door strike.
What i’d done: Connected 12V supply to emitter of PNP, base to Arduino,
collector to LOAD>resistor>GND (i have attached a photo of my circuit)
When i setup everything and turned on the 12V supply, and set arduino output to HIGH, it shouldn’t have any current passing thru the load. BUT, instead there is current flowing thru the load even if i set arduino output to HIGH or LOW.
Could it be because arduino is 5V and cannot control the 12V?
If so, has anyone got suggestions pls? I need the load to be connected to GND because i want to combine other circuits to the load.
I know i can connect the 12V supply to LOAD then to NPN transistor. But i need LOAD to connect to GND so i use a PNP transistor. it doesnt seem to work with the 5V arduino.