On Saturday, 28 December 2019 14:54:52 GMT Terry Coles wrote: > I'm not sure what to suggest from a diagnostic point of view other than > measuring the voltage levels with a multimeter when the clock pin is > disconnected and simply programmed to high. Measuring the frequency and > pulse shape is a bit difficult without a scope.
I should clarify that the DS1820 is using GPIO Pin 04 as an INPUT not an O/P as I've implied above, but measuring the O/P voltage at least shows that the pin can do something. It is a bit more difficult to test the input, but it can be done with an external source (with a resistor to protect the pin) if need be. Wikipedia shows what you should be getting if you have access to a scope, see https://en.wikipedia.org/wiki/1-Wire. -- Terry Coles -- Next meeting: BEC, Bournemouth, Tuesday, 2020-01-07 20:00 Check to whom you are replying Meetings, mailing list, IRC, ... http://dorset.lug.org.uk/ New thread, don't hijack: mailto:dorset@mailman.lug.org.uk
