Search found 294 matches

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: 93

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: 527

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 All screen printing is done with manmade fibers these days, and the tern “silkscreening” is out of date.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: 93

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: 93

Re: 6 Stepper motors attached to a mega

You need to provide more details about how you've hooked things up.
by darrellg
Sat Jan 20, 2018 3:53 pm
Forum: SparkFun Product Questions
Topic: Power questions. Addressable RGB LED Music and Sound Visualizer
Replies: 8
Views: 142

Re: Power questions. Addressable RGB LED Music and Sound Visualizer

If you are using a regulated power supply, there should be no need for the Pololu 5V Step-Up/Step-Down Voltage Regulator. Each device will only use as much current as it needs. You could have a power supply with 5V 1000A capability, and the board will only use what it needs. The current required by ...
by darrellg
Fri Jan 19, 2018 3:57 pm
Forum: SparkFun Product Questions
Topic: Power questions. Addressable RGB LED Music and Sound Visualizer
Replies: 8
Views: 142

Re: Power questions. Addressable RGB LED Music and Sound Visualizer

When I do it that way, I put the board in a project box and add a panel mount power jack. I can't seem to find one on the Sparkfun site, but they do have this: https://www.sparkfun.com/products/10288 . You do have to connect the 5V supply directly to the 5V pin on the board instead of the power conn...
by darrellg
Fri Jan 19, 2018 3:00 pm
Forum: SparkFun Product Questions
Topic: Power questions. Addressable RGB LED Music and Sound Visualizer
Replies: 8
Views: 142

Re: Power questions. Addressable RGB LED Music and Sound Visualizer

The Redboard is going to supply about the same as an Arduino Uno. There is a linear voltage regulator on the board that converts the input voltage to 5V, but it has a limited capacity and will not power anywhere close to the number of LEDs as you plan on using. The best and safest way to power your ...
by darrellg
Fri Jan 19, 2018 1:42 pm
Forum: SparkFun Product Questions
Topic: Power questions. Addressable RGB LED Music and Sound Visualizer
Replies: 8
Views: 142

Re: Power questions. Addressable RGB LED Music and Sound Visualizer

Sparkfun has many fine tutorials, but I find that the Adafruit tutorial on this subject is superior. You can find it at https://learn.adafruit.com/adafruit-neo ... e?view=all. It addresses the areas you are asking about.
by darrellg
Tue Jan 16, 2018 2:33 pm
Forum: Projects
Topic: FTDI connections
Replies: 3
Views: 100

Re: FTDI connections

You want to connect one of these: http://www.kenwood.com/i/products/info/amateur/ts_480/ to a PC and you have something like https://www.sparkfun.com/products/12977 ? Why don't you just get something like this: https://www.newegg.com/Product/Product.aspx?Item=N82E16812120751&cm_re=usb_serial-_-12-12...
by darrellg
Tue Jan 16, 2018 11:10 am
Forum: Projects
Topic: FTDI connections
Replies: 3
Views: 100

Re: FTDI connections

Maxim MAX3232 is a common RS232 to TTL serial interface chip. It's available in a DIP package and can operate at 5V.
https://www.digikey.com/product-detail/ ... ND/1513011
by darrellg
Tue Jan 02, 2018 2:42 pm
Forum: General Chit Chat
Topic: Autodriver V13/ steppers not completing large movements and stopping on continuous rotations
Replies: 6
Views: 596

Re: Autodriver V13/ steppers not completing large movements and stopping on continuous rotations

According to the datasheet, VSthOff is 6.6V, minimum. If your motor supply voltage is lower than that, the device goes into undervoltage lockout (sec 6.10 in the datasheet). If you are using a motor supply voltage high enough to prevent an undervoltage lockout, your are going to draw too much curren...
by darrellg
Thu Dec 28, 2017 4:30 pm
Forum: General Chit Chat
Topic: Autodriver V13/ steppers not completing large movements and stopping on continuous rotations
Replies: 6
Views: 596

Re: Autodriver V13/ steppers not completing large movements and stopping on continuous rotations

Could be overcurrent or thermal shutdown. Are you sure your motors are within the capabilities of the driver?
by darrellg
Thu Dec 21, 2017 4:47 pm
Forum: Projects
Topic: micro:bit pin extension
Replies: 4
Views: 152

Re: micro:bit pin extension

Sparkfun sell a breakout that works with solderless breadboards: https://www.sparkfun.com/products/13989.
Here's its hookup guide: https://learn.sparkfun.com/tutorials/mi ... okup-guide.
by darrellg
Thu Dec 21, 2017 4:45 pm
Forum: Projects
Topic: micro:bit pin extension
Replies: 4
Views: 152

Re: micro:bit pin extension

There are more than three pins on a micro:bit. There are three big ones that can be used with an alligator clip, but the small ones are data pins as well. Some of them are used with the LED matrix, but that doesn't mean you can't use them externally as well. If you get a kit with an edge connector, ...