Search found 305 matches

by darrellg
Thu May 17, 2018 8:59 am
Forum: Arduino
Topic: sk6812 side led strip is controlled by Arduino
Replies: 1
Views: 41

Re: sk6812 side led strip is controlled by Arduino

SK6812 is a clone of the WS2812. You can use the Neopixel library to control them.
by darrellg
Mon May 14, 2018 10:37 am
Forum: SparkFun Site Questions/Comments
Topic: Low Cost GPIB to USB Controller
Replies: 3
Views: 97

Re: Low Cost GPIB to USB Controller

According to the results of the recent customer survey ( https://www.sparkfun.com/news/2679 ), 70% of Saprkfun sales are for hobbyist use. Most new test gear uses USB and/or Ethernet interfaces. I don't work for Sparkfun, but those two facts would be strong arguments against carrying anything GPIB r...
by darrellg
Wed May 02, 2018 8:37 am
Forum: Arduino
Topic: No Response from Hardware (Hardware not Broken)
Replies: 3
Views: 105

Re: No Response from Hardware (Hardware not Broken)

Also, your button will need an external pulldown resistor. Alternately, you can use the internal pullup and modify your program so that it is active low instead of high.
by darrellg
Tue Apr 24, 2018 9:02 am
Forum: SparkFun Product Questions
Topic: lm324 amp help
Replies: 9
Views: 1035

Re: lm324 amp help

You should really start looking at the date on the threads you reply to. This one is over 7 years old.
by darrellg
Wed Apr 11, 2018 1:04 pm
Forum: Arduino
Topic: Arduino pro micro keeps bricking after uploading code
Replies: 1
Views: 82

Re: Arduino pro micro keeps bricking after uploading code

What is it you expect it to do? Your sketch intentionally puts it in a non-responsive state for nearly a minute at a time and only wakes it long enough to check the state of one pin.
by darrellg
Thu Apr 05, 2018 2:21 pm
Forum: Arduino
Topic: CAN BUS Shield on Arduino Mega
Replies: 3
Views: 128

Re: CAN BUS Shield on Arduino Mega

This is a common problem with shields that use SPI. Yes, you will need to patch those pins to the correct pins on the Mega.
by darrellg
Fri Mar 30, 2018 9:50 am
Forum: General Chit Chat
Topic: NEW GUY here! I need help and just wanted to say Hi!
Replies: 3
Views: 611

Re: NEW GUY here! I need help and just wanted to say Hi!

That's not how LEDs work. You can't think of them like light bulbs. You have to think of them like diodes, which is what they are. They have no way to self-limit their current. You have to either use a current-limited power supply, or put a resistor in series to limit the current. https://learn.spar...
by darrellg
Thu Mar 22, 2018 9:33 am
Forum: Projects
Topic: Super wide pitch addressable LED strip?
Replies: 1
Views: 91

Re: Super wide pitch addressable LED strip?

I haven't seen them with less than 30/m. You can cut a strip and extend it with wires, or use something like this.
by darrellg
Wed Mar 21, 2018 9:04 am
Forum: PCB Design Questions
Topic: Eagle 7.x, or 8
Replies: 1
Views: 123

Re: Eagle 7.x, or 8

You can have both installed at the same time. If you're just using the free version, the change to a subscription model doesn't really have an effect on you. It's been discussed endlessly on other fora.
by darrellg
Fri Feb 09, 2018 3:28 pm
Forum: Projects
Topic: Uno pin output enough to power mini-Christmas tree light?
Replies: 2
Views: 182

Re: Uno pin output enough to power mini-Christmas tree light?

in addition to the single pin current limit, the AVR micros have total current sourcing limits. You can't draw 40mA from every pin at the same time. I don't know what it is off the top of my head, but it's in the '328 data sheet.
by darrellg
Fri Feb 02, 2018 3:35 pm
Forum: SparkFun Product Questions
Topic: Cutting the trace on 5v to 3.3v
Replies: 10
Views: 652

Re: Cutting the trace on 5v to 3.3v

One small issue. Nobody “silkscreens” anything anymore. All screen printing is done with manmade fibers these days, and the tern “silkscreening” is out of date. This may be true, but no one refers to the printed reference layer of a PCB as anything but the silkscreen layer. It may be technically wr...
by darrellg
Tue Jan 23, 2018 10:19 am
Forum: Projects
Topic: 6 Stepper motors attached to a mega
Replies: 3
Views: 175

Re: 6 Stepper motors attached to a mega

Yes, when you use the full editor:
Capture.PNG
by darrellg
Mon Jan 22, 2018 4:39 pm
Forum: Projects
Topic: 6 Stepper motors attached to a mega
Replies: 3
Views: 175

Re: 6 Stepper motors attached to a mega

You need to provide more details about how you've hooked things up.