Computer Science Canada Voltage of CPU parallelport |
| Author: | xHoly-Divinity [ Tue Aug 05, 2008 8:34 am ] |
| Post subject: | Voltage of CPU parallelport |
Anyone happen to know how much voltage a typical PC can provide from its parallelport... sadly I do not have a working voltmeter =( |
|
| Author: | apomb [ Tue Aug 05, 2008 8:35 am ] |
| Post subject: | RE:Voltage of CPU parallelport |
up to 5 volts |
|
| Author: | Insectoid [ Tue Aug 05, 2008 8:53 am ] |
| Post subject: | RE:Voltage of CPU parallelport |
I believe that everything in the computer (except lights if you have a clear lit case) runs on 5 volts or less. I know there isn't enough to run 2 LEDs in the same output, at least. |
|
| Author: | Zeroth [ Tue Aug 05, 2008 8:57 am ] |
| Post subject: | Re: Voltage of CPU parallelport |
Apomb's right, about 5 volts. However, it depends on which pin, since most of them are signal inputs. If you want consistent voltage without worrying about any software negotiation or chips needed, look at usb pin-outs. And google that term there for better information. |
|
| Author: | md [ Tue Aug 05, 2008 8:31 pm ] |
| Post subject: | RE:Voltage of CPU parallelport |
it's the current you can source/sync that matters much more then the voltage (which is 5v). Most parallel ports will do ~10mA tops. |
|