EZB4 has a built in voltage and cpu temp control.... No need to use analog and a separate voltage meter... Not sure what you mean by noisy... what are the 5 analog sensors and what type of interference are they causing?

Do you have any pull down resistors between signal and ground?

The reason you would use an external one is if you are using say a 7.4v battery, then limiting the input into the ezb using something like an ubec. You would do this if you have only 5v devices and don't want to limit after the ezb to every device. This kills the ability of the V4 to monitor power. Nothing against the v4, just a robot design thing.

An option would be to build a power distribution panel and have the ubec in line before this panel that you would use for devices and power the V4 off of the battery directly. This would allow the power monitoring in the V4 to work and allow you to ditch the other device.

.... Check your analog sensors to see if they can operate below 5v as the V4 analog output pin is 3.3V... I had an issue with a cheap PIR sensor and my V4 board because it needed 5v....

must have outside interference.

What do you mean noisy?

I think he means he plugged it up to a occilliscope and sees "noise" through the connections. But if wires are not shielded and grounded they are always going to have some. I guess we will wait for a better explanation.

Thanks for all the replies. What I mean by noise is unwanted signal. For example on the V4 window that shows battery voltage and cpu temp, on mine the numbers are not steady. My battery is at 12.51 volts and steady on my multimeter but on the V4 information window it changes at each update from about 12.33 to 12.61, this is the noise. The cpu temperature is a little jittery too. Thanks for all the help.