Search found 358 matches

by darrellg
Fri Feb 15, 2019 10:35 am
Forum: Projects
Topic: Making stand-alone USB buttons/switches/etc. ?
Replies: 6
Views: 41

Re: Making stand-alone USB buttons/switches/etc. ?

Arduino type boards that use the ATmega32U4 (Leonardo, Pro Micro, etc.) can emulate an HID keyboard. You can attach as many buttons as there are GPIO pins available and use them to send whatever keyboard input you want, including multiple key presses per button press.
by darrellg
Tue Feb 12, 2019 12:09 pm
Forum: SparkFun Product Questions
Topic: TF Lidar Mini
Replies: 1
Views: 21

Re: TF Lidar Mini

Qwiic is just I2C with a convenient connector. This is probably what you want:
https://www.sparkfun.com/products/14425
There is one with female pins as well.
by darrellg
Mon Feb 11, 2019 3:05 pm
Forum: SparkFun Product Questions
Topic: BOB-09056 incorrect documentation?
Replies: 3
Views: 50

Re: BOB-09056 incorrect documentation?

Digital inputs must be tied to either high or low, as appropriate. If you leave them floating, they will be in an unpredictable state. Here are some references:

https://learn.sparkfun.com/tutorials/logic-levels/all

https://learn.adafruit.com/circuit-play ... ing-inputs
by darrellg
Fri Feb 08, 2019 2:01 pm
Forum: SparkFun Product Questions
Topic: BOB-09056 incorrect documentation?
Replies: 3
Views: 50

Re: BOB-09056 incorrect documentation?

This may be a stupid question, but did you actually connect s3 to ground or did you leave it floating?
by darrellg
Thu Feb 07, 2019 4:52 pm
Forum: Wireless/RF
Topic: Copper Balancing
Replies: 6
Views: 70

Re: Copper Balancing

by darrellg
Mon Feb 04, 2019 12:06 pm
Forum: Arduino
Topic: Attach Standard 7 Segment LED to Large Digital Driver
Replies: 2
Views: 60

Re: Attach Standard 7 Segment LED to Large Digital Driver

The large digit driver boards have an 8-bit serial-in parallel-out shift register and resistors to limit the current through the LED segments. They are set up for the voltage and current requirements of the large 7 segment displays that SF sells. It is certainly possible to add more shift registers ...
by darrellg
Thu Jan 31, 2019 9:49 am
Forum: Arduino
Topic: Large Digital Driver
Replies: 6
Views: 94

Re: Large Digital Driver

The postNumber function only shifts out one digit at a time. If you have multiple digits, you'll have to call it multiple times.
by darrellg
Sat Jan 26, 2019 10:33 pm
Forum: Projects
Topic: lumenati 3x3
Replies: 7
Views: 163

Re: lumenati 3x3

We all make simple mistakes occasionally.
by darrellg
Thu Jan 24, 2019 9:46 am
Forum: Projects
Topic: lumenati 3x3
Replies: 7
Views: 163

Re: lumenati 3x3

I can't tell where the other end of your wires go, but you should know that the wires you are holding in your hand in the first photo are connected to the output of that device. If you are trying to send your clock and data into that end, it will not work.
by darrellg
Thu Jan 24, 2019 9:26 am
Forum: SparkFun Product Questions
Topic: Logic Level Converter - Single Supply Voltage In
Replies: 5
Views: 244

Re: Logic Level Converter - Single Supply Voltage In

If you are certain it was connected correctly, then you should contact Sparkfun support (https://www.sparkfun.com/support) and ask them what your next step is.
by darrellg
Fri Dec 28, 2018 10:51 am
Forum: Projects
Topic: safety inquiry
Replies: 11
Views: 219

Re: safety inquiry

I am not. The only reason I know to check with the CDRH is that you mentioned it was related to laser regulation, with which I have some experience. I can't think of any other agency that would deal with that type of stuff, but you never know when it comes to government regulation. Something like ht...