Supercaps On 3.3v Rail, Preventing Ezb To Connect?

cem

United Kingdom

Asked Jun 2017 — Edited Jun 2017

@Jeremie I hate to bring this topic up again, ( its been about a year )

Back last year I put two SuperCap rated 1.5f @ 5v in series ( 1.5f 10v ) on EZB's input servo power ( 6v Battery ) to prevent brownouts and its been very successful, and worked well. ( Stopped brownouts ).

But since converting some of InMoov's large scale HS-805BB servo's over to EZ-Robots HDD Servo's I've been getting Brownouts? So I tried various things but still kept getting brownouts.

I then put one of the 1.5f 5v caps on the 3.3v rail of the EZB as you recommended last year, but for some reason it prevents me from connecting to the ARC in Client mode? I've checked and double check and its wired up correctly and as soon as I've removed it, it connects OK! I've carried this out a number of times powering off and back on in-between and get the same results. I also tried other supercaps, just in-case these two have gone faulty, but still get the same result, regarding the wifi connection.

I measured the 3.3v rail, when the supercap is connected and its still 3.3v, so its not being pulled down at all?

Any ideas?

Cheers Chris.

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Synthiam

#17 Jun 2017

@CEM - do not create new threads for topics that you have already started. A new thread with a single message doesn't have any relationship to anyone else reading it. I have pasted your message here below...

Quote:
@Jeremie

Just thought I'll give you an update, to close out on this.

I spent some more time with the supercap issue, and it does look like it works with a small value cap, I used a 1f 5v cap, and it initializes OK, but not with the 1.5f. 5v cap. I completely removed everything off the EZB ( standalone ) and it still doesnt initialize with the 1.5f, but does with a 1f, as I said before my other EZB and the IOTiny works fine with the 1.5f.

( I know I said it does initialize but doesn't just connect to the ARC, I was wrong I had the sound disconnected ). blush

Interesting I did use another 1.5f and it made it worse and the EZB buzz like mad! I assume it puts the EZB into a locked state may be something to do with the 'in-rush' current of the high value cap, pulling down the 3.3v for a few ms?

Anyway I'm going to redo the power on my InMoov and have a separate supply for the EZBs, and have the large SLA battery just for the Servos.

Once again thank you for your support, I want to thank EZ-Robots for designing the HDD servos, I know you put a number of years work into them, but it sure paid off, as they are just FANTASTIC!

Cheers Chris.