Where communities thrive


  • Join over 1.5M+ people
  • Join over 100K+ communities
  • Free without limits
  • Create your own community
People
Repo info
Activity
Chris Elsworth
@celsworth
time for scope testing I guess
Stavros Korokithakis
@skorokithakis
@celsworth do you have a logic analyzer?
Chris Elsworth
@celsworth
only a cheap ripoff.. £15 from aliexpress thing
but yes
Stavros Korokithakis
@skorokithakis
hah, 15 quid? i got mine for $7 :P
Chris Elsworth
@celsworth
it was still a lot cheaper than a Saelae ;)
Stavros Korokithakis
@skorokithakis
but yeah, i was going to offer to check out the frequency if you didn't have one
i agree
i kinda feel bad though, their logic analyzer software is so good that i want to support them
maybe my next analyzer will be a saleae
Chris Elsworth
@celsworth
likewise, but they are very expensive :/
Stavros Korokithakis
@skorokithakis
eh, it's less than $100 i think
oh, $109
not prohibitively expensive, but yeah, it's not $7
Chris Elsworth
@celsworth
well, the 4 isn't.. very good :/
Stavros Korokithakis
@skorokithakis
oh? why not?
Chris Elsworth
@celsworth
it looks quite limited in speed, very low sample rates?
the 8 is almost 10 times faster
Stavros Korokithakis
@skorokithakis
hm that's true
i'm a novice, so for what i do i only need kilosamples/sec
Chris Elsworth
@celsworth
and also you get a lot more analog ports on the 8, only 1 on the 4
Stavros Korokithakis
@skorokithakis
i think my cheapo chinese one can do 25 MS/s
yeah :/
Chris Elsworth
@celsworth
even that 25M/s is faster than the Logic 4 :(
Stavros Korokithakis
@skorokithakis
yeah exactly
so you'd be paying 12 times more for a downgrade
Chris Elsworth
@celsworth
yep, kinda silly
so if I was going to get any I think it would be the 8.. don't need the Pro
good thing really as by then you're up to $400 :)
Stavros Korokithakis
@skorokithakis
yep :package:
:P
Chris Elsworth
@celsworth
on another note, I'm starting to dip my toe into native sdk coding a little, and every time I do I have newfound appreciation for how simple arduino core makes all this :)
Stavros Korokithakis
@skorokithakis
sounds like i should steer clear from the native sdk, huh
Chris Elsworth
@celsworth
setting a pin to do pwm, one line of easy code in arduino, and I haven't yet worked out how to do it in native sdk after 15 minutes of looking at sdk docs
Stavros Korokithakis
@skorokithakis
wow
Stavros Korokithakis
@skorokithakis
do the pullup resistors for the bare esp need to be 10k, or can i use 3.5k?
Sven Eliasson
@comino
you can
Stavros Korokithakis
@skorokithakis
will it affect anything?
Sven Eliasson
@comino
more power consumption
Stavros Korokithakis
@skorokithakis
ah, thanks
Sven Eliasson
@comino
and maybe slower flanks for the esp
(high -> low)
Stavros Korokithakis
@skorokithakis
hmm i see
that should be fine
Chris Elsworth
@celsworth
ok, PWM seems to max out at around 50kHz, so I guess its quite a bit more limited than bit banging
even at 50Khz its getting pretty shakey on the scope, not very stable
Stavros Korokithakis
@skorokithakis
that's odd
try bitbanging and see if it's better?
Chris Elsworth
@celsworth
ok
Stavros Korokithakis
@skorokithakis
that's surprising, though