Greg Erskine wrote: > hi Erik Sjödin, > > WARNING: You can destroy your Raspberry Pi playing around with the GPIOs > if you do the wrong thing!!! > > Did you look at my circuit? It has resistors!! Very important. A lot of > people advise using a transistor buffer for extra safety. > > For input circuits you are supplying the 0 or 1 (0 volt or 3.3 volt) > > Note: The Raspberry Pi GPIO naming conventions are confusing. Make sure > you are connecting to the right GPIO. > > regards > Greg
Yes I know I can destroy my Pi but it is only 35$ :) and yes i looked at your circuit but people also say adding resistors are not always nessesary so I decided to try without according to this guide: http://razzpisampler.oreilly.com/ch07.html "Each GPIO pin has software configurable pull-up and pull-down resistors. When using a GPIO pin as an input, you can configure these resistors so that one or either or neither of the resistors is enabled, using the optional pull_up_down parameter to GPIO.setup. If this parameter is omitted, then neither resistor will be enabled." It seems like I did forgot to configure the software configurable resistor on the GPIO. Its strange, your circuit defines a 3.3V signal while the description I used for my recent test only connects between GPIO 18 and ground and they are both defined as input pins. I will try your circuit example this week as I assume from reading the internet is the most reliable and safe way to do it. Thanx once more for your time and effort. Erik ------------------------------------------------------------------------ Erik Sjödin's Profile: http://forums.slimdevices.com/member.php?userid=64255 View this thread: http://forums.slimdevices.com/showthread.php?t=97803
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