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Resolved by Proteus!
Playback Of Several Several Servo Recorder Recordings Disconnects EZB V4
Has anyone had this issue? When I play back three recording of six servos the EZB will randomly disconnect from WIFI to my router. The EZB does not brown out or reboot. It simply disconnects. There are also other scripts running at the same time moving other servos and sound file playback on the robot.
There's my setup and what I did:
- I have three servos in each arm in my robot for a total of 6.
- I'm using EZ Robot's HDD servos.
- One servo moves a wrist, Second one opens and closes a claw and the third rotates the claw about 180 back and forth.
- I used the servo Pad to move them and used the servo Recorder to record them.
- I now have three recordings. One recording is of left arm moving the wrist and rotating the claw, second recording is the same but of the right arm, third is of both claws (right and left) opening and closing.
- The servos in the recordings are moving very fast.
- The recordings are playing back at the speed of 1.0 (normal speed)
Here's how I solved the issue. The EZB does not disconnect anymore:
- I reduced the playback speed to 0.6. *I haven't tested raising the playback speed yet to see at what point I'll start getting disconnects again. It's a random problem and I don't want to spend hours finding that line. I'm ok with the speed of 0.6 for now but would like a more frantic look.
My Question: Why am I getting WIFI disconnects at full playback speed? Am I flooding the WIFI digital pipeline?
Related Hardware EZ-B v4
Related Control
Servo Recorder
I'm still not able to get My EZB to boot properly with the banked supercaps attached to the 3.3v power rail of the ADC header to try to solve the brown out issue.
I've tried for many days using two different sets of banked supercaps and different methods to try to figure out why it's not working. I can't get it to work consistently with weird results sometimes. The weirdest result is at Mark 11:39 that will make you laugh.
I think It's time to move on and find a different solution I think. Here's a video of my struggles and results if you're interested:
Add a switch then. A super cap is a battery. So unless it’s fully drained, you’ll always have some power. Jeremie explained that earlier.
Humm, A switch, That's a genius idea.
Thanks for the video Dave! Everything looks great in terms of how you hooked it up. I posted a comment on your YouTube video. I believe that brand of cap, or the material it’s made of is likely slow to charge. The slow charge is affecting the output stage (3.3V) of the EZ-B and causing very odd behaviour. I’ll have a look at the brand I use, I know they are aerogel, and let you know.
Thanks Jeremie,
I can't find anywhere in the caps datasheet that says anything about Aerogel. Here's the order page on Mouser of the ones I'm using.
AVX Supercaps
In fact I'm having a hard time finding Aerogel Supercaps anywhere. If you don't mind, what brand are you using and where do you get them?
Hello Dave,
I was just lurking around today. Here are some pictures of my super caps that I’ve never had a problem. Sorry I don’t remember where I got them at but it might help with the name that’s on the caps. Name on caps say superstor .
This May not help or you already have this script running.
EDITED: I have my caps on ACD7
Right on @Merne! You beat me to it, I was just about to comment that the supercaps I've always used are Cooper-Bussmann PowerStor Aerogel (with Low ESR). My caps were also labeled "Series B". There are other PowerStor caps from Eaton that have worked for me as well.
Datasheet here: http://static6.arrow.com/aropdfconversion/5595f83bc15c9d812700e2f0df7c9c90edf2c0c4/powerstorp_specs.pdf
They are available at Digikey and Arrow, among other places. I got mine from Solarbotics and Digikey.
Maybe it's the ESR value from the caps you have Dave? ESR (equivalent series resistance) will affect how fast a cap charges and discharges, the lower the ESR the better!
Thanks @Jeremie.
@Dave Maybe you should try using the same caps as Jeremy’s or the ones I’m using as a last ditch attempt.
Also I noticed in your video, I’m not sure if your sound amplifier have its own power source or getting it from the EZB and are you using the caps on the bottom EZB too?
last question please; on your B9 you are using EZB’s too, right. Is it the same Wi-Fi that you’re trying now on the B9 you’re working on?
I really hope you get this figured out as you have spent a lot of time and love of labor putting this B9 back together.
Cheers, merne