PDA

View Full Version : 595 finger controlled



synnie
04-15-2009, 06:43 AM
Ok, have gotten my 2nd 595 all together and have made it up to run LEDs direct from the board without SSR's.Hooked it all up to just the REN-C and no lights, mainly because my other 595 works fine just using the indicater LEDs to show whats working and dimming.REN-C is fine, heartbeat and data light working, nothing on the 595.Unless i go to touch the RJ45 In jack on the 595 then all the LEDs come on.This is with my finger being 5mm away from the jack,Shortened the cables and now if i touch the jack all the LEDs come on.Any ideas?
Thanks Synnie

klanger
04-15-2009, 07:32 AM
Dodgy earth??

ErnieHorning
04-15-2009, 02:14 PM
The only way that I can think of to turn on all lights at the same time is if pin 12 of the 74595 chips is not connected to the RJ45 connector. It’s coincidental that all the lights come on; it could also just be some.

synnie
04-15-2009, 03:07 PM
Could be dodgy earth as when i disconnect the negative from the 5vdc supply everything still works

sandy
04-17-2009, 10:41 AM
It's a feature ;)