i m thinking about building a BMC using a raspberry. So i need to simulate power and reset button press using the GPIO.
I would like to know if a transistor is suitable for this application and if yes, which type (NPN /PNP); and if possible where i need to connect the Collector and Emitter of the transistor.
According to the FrontPanel I/O Connectivity Design Guide, the power and reset circuits should be like this :
RST_SW_N Reset Switch low reference pull-down (100 ohm) to GND
RST_SW_P Reset Switch high reference pull-up (1000 ohm) to +5 V
PWR_SW_N Power Switch high reference pull-down (100 ohm) to GND
PWR_SW_P Power Switch high reference pull-up (10000 ohm) to +5 V
I have been inspired by this post for this project. I contacted the author, but he does not know what type of transistor he used, and did not even used a propre voltage divider to sense the motherboard PWR led.
Thx, regards Ben