Pas Home / Eagle 7.1.0 Pro First design

RE: Pas Home / Eagle 7.1.0 Pro First design

kipe — Thu, 21 Aug 2014 21:27:45 GMT

Judging by the schematics posted above, 3.3V is coming from the Pi. The 3.3V line is rated (if I remember correctly) at 500 mA, which should be enough for this kind of use. I don't however have any idea if the Pi uses this line also.

For my design I'm planning on using a separate regulator for controlling the devices I need from a separate regulator, so I can debug the system isolated from the Pi. I've done some initial test with the current design, but these aren't in any way complete. Not actually sure if the design will be ready for the deadline of this design challenge, although I'm aiming for it. If [mention:6d93ea79e62745088ec2489828c0ce1e:e9ed411860ed4f2ba0265705b8793d05] reminds me in a few days, I can test my current Onewire network with a similar setup just to see if I experience similar problems.

Just out of interest, were the issues experienced with the Pi B+? This is because the old Pi had quite picky power circuit, which has caused me a lot of problems before...

RE: Pas Home / Eagle 7.1.0 Pro First design

mcb1 — Thu, 21 Aug 2014 03:39:01 GMT

I wondering if the issue is with the on board 3v3 regulator.

Generally speaking they are much lower current rated than the 5v ones.

Have you tried sticking a 4700uF or larger across the 3v3 line.?

Now that you have your scope you could check to see it is 3v3 and that there is no noise on it.

Is it possible to run your micro on 5v.?

re level translators

The general rule with any IC is never apply a voltage to any pin greater than the supply voltage. (unless it's special purpose pin)

Mark

RE: Pas Home / Eagle 7.1.0 Pro First design

verrverr — Thu, 21 Aug 2014 02:55:11 GMT

I check and my schematic is not good i run on the 5v pin without level translators. Does this level converter can do the job https://www.adafruit.com/products/395

RE: Pas Home / Eagle 7.1.0 Pro First design

michaelwylie — Wed, 20 Aug 2014 03:27:47 GMT

I don't see anything physical wrong with the first design. Maybe the code?

RE: Pas Home / Eagle 7.1.0 Pro First design

michaelwylie — Wed, 20 Aug 2014 03:21:43 GMT

Do each of those sensors have a different ID?

Edit:

"Each Device has a Unique 64-Bit Serial Code Stored in an On-board ROM"

RE: Pas Home / Eagle 7.1.0 Pro First design

verrverr — Wed, 20 Aug 2014 01:30:03 GMT

Very easy to find missing component with Eagle +1