As you seem to only be reading through the GPIO, I would recommend a simple resistor voltage divider to cut the 5v to 3.3v max.
Of course this assumes that you are not going to get high voltage spikes on the GPIO pin from some other source - if that is a possibility then a resistor and zener diode might be the way to go. For bidirectional signals, you can get level shifter ICs very cheaply. Susan On Wednesday, July 27, 2016 at 6:14:28 AM UTC+10, Robin wrote: > > Sorry for the simple questions, but I need some basic help. > > I am interested in the Instromet Sunshine Sensor which detects if the sun > is shinning (or not). > > http://www.instromet.co.uk/sunsensor.html > > The stand alone unit outputs a 5 volt signal when the sun is shinning and > 0 volts when it is not. I'm currently running on a Raspberry Pi with a > Vantage Pro 2. > > Can I monitor this output directly using the GPIO or do I need an add on? > -- You received this message because you are subscribed to the Google Groups "weewx-user" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
