MP3Car.com - View Single Post - Renault "Tuner List" Head Unit/CD changer hacking

pippolippi · 02-17-2006, 03:54 PM

Quote: Originally Posted by Vicne

Cool. I never tried that. I'm asking because I'd like to switch my relays from CDC to PC only when the PC is booted and ready to fake the changer ;-)

You could also use the parallel port: I'm using a circuit like the second one here (the one under "safer new design"), the only problem is that the data pins are active for a very short while when the pc is switched on/reset. It's not a problem in my application but it's going to be in yours. Maybe the serial port (or the parallel port in your motherboard) doesn't exhibit the same problem. You can check it with an oscilloscope or simply building the circuit and see if the relays energizes when turning on the pc. If it does you can add a delay circuit.

02-17-2006, 03:54 PM	#130
pippolippi Constant Bitrate Join Date: Feb 2006 Posts: 113	Quote: Originally Posted by Vicne Cool. I never tried that. I'm asking because I'd like to switch my relays from CDC to PC only when the PC is booted and ready to fake the changer ;-) You could also use the parallel port: I'm using a circuit like the second one here (the one under "safer new design"), the only problem is that the data pins are active for a very short while when the pc is switched on/reset. It's not a problem in my application but it's going to be in yours. Maybe the serial port (or the parallel port in your motherboard) doesn't exhibit the same problem. You can check it with an oscilloscope or simply building the circuit and see if the relays energizes when turning on the pc. If it does you can add a delay circuit.