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Seperate Grounds

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8 Threads found on edaboard.com: Seperate Grounds
If the ground planes are sufficiently large and good organized you connect all of them to chassis ground together. Using seperate ground planes is to isolate the gorunds of signal,rf,digital prevent any disturbances but at last point these grounds can be connected electrically good conducting chassis ground with many screws.
The two grounds should cover seperate areas of the PCB and should not intermingle, if they due them change the placement or use one ground.
For the ground DONT. 4 grounds! Why? I would reccomend you do some serious research around the web, most people reccomend that you dont split the grounds, but seperate your analogue and digital into to seperate areas to avoid the signals interfering, so you end up with a analogue area and a digital area, but one contigous (...)
Use one ground seperate the digital and analogue sections and have An intuitive, practical approach to mixed-signal grounding ww
Star ground is one approach. Keep all grounds on the board seperate and join them at one point. That point should be where the common ground for the power supplies connects to the board. All grounds meet at one point. This should prevent high currents in the solenoid circuits from disrupting the lower current circuits.
just try to seperate the micro controller power supply and the relay power supply and ground.isolate both the grounds the relay and the micro i think this might solve the problem r use an inductor r a 0 ohm resistor for the power supply and the ground that leads to the relay
two seperate planes will be used for AC and DC ground during PCB layering. finally these two grounds will be connected trough a ferrite beed( inductor)
seperate regulators are a good way to isolate. You can keep the analog and the digital ground planes seperate and only connect them at one common point.