Search found 5628 matches

by Mee_n_Mac
Fri Mar 13, 2015 7:58 pm
Forum: SparkFun Product Questions
Topic: What would I need to measure level?
Replies: 2
Views: 362

Re: What would I need to measure level?

gnozahs wrote: What would I need?
To tell us more. Is this apparatus and cylinder vertical or horizontal or ? How big is this ? How much space is there between the apparatus and the cylinder walls ? How close to being perfectly centered and level do you need to be (what are your tolerances) ?
by Mee_n_Mac
Tue Mar 10, 2015 8:40 pm
Forum: Projects
Topic: Battery Powered Push Buttons with Unique Identifiers
Replies: 3
Views: 467

Re: Battery Powered Push Buttons with Unique Identifiers

Is it possible to use the transmitter without a controller and still produce a unique signal for a receiver? I think you're on the cheapest cost RF approach, but no I don't see any good way to use these simple AM Tx/Rx pairs w/o some form of "controller". You may want to look at Adafruit's 4 "key" ...
by Mee_n_Mac
Mon Mar 09, 2015 2:19 pm
Forum: SparkFun Product Questions
Topic: Multiple easydrivers using the same I/O pin for dir
Replies: 2
Views: 341

Re: Multiple easydrivers using the same I/O pin for dir

What would I look at to find this out?
You'd look at the current for the logic inputs on the driver IC, which are listed at 20 uA max. So I'd say you can drive as many in parallel as you care to.
by Mee_n_Mac
Mon Mar 09, 2015 1:08 pm
Forum: Projects
Topic: Series/parallel batteries
Replies: 4
Views: 673

Re: Series/parallel batteries

A DPDT wired this way. You can probably find one w/a center off position as well.
DPDT_switched_batts.jpg
parallel/series switched batteries
DPDT_switched_batts.jpg (20.37 KiB) Viewed 598 times
by Mee_n_Mac
Mon Mar 09, 2015 12:14 pm
Forum: Arduino
Topic: How to use the arduino breadboard syb 46?
Replies: 5
Views: 1091

Re: How to use the arduino breadboard syb 46?

It seems to me that you're missing the fact that the commonly used breadboards have two power rails . For example, in the post you shared me we can see a breadboard with two power rails But my breadboard has just one power rail. That confuses me extremely :( Well it still works the same as the othe...
by Mee_n_Mac
Sun Mar 08, 2015 9:36 pm
Forum: Arduino
Topic: Need help getting started
Replies: 6
Views: 590

Re: Need help getting started

And to illustrate a concept (pseudo-code) ... void loop() { // read the brake pedal switch if (digitalRead(BrakePin) == ACTIVATED) { doFlashSequence(); } else { // brake is not activated, reset time, turn off LEDs BrakeTime = millis(); LEDs = off; } } .... then the timing of on/off for the LEDs is d...
by Mee_n_Mac
Sun Mar 08, 2015 8:50 pm
Forum: Arduino
Topic: Pulling 555 timer reset line low
Replies: 10
Views: 1175

Re: Pulling 555 timer reset line low

I just wanted to vent my anti-ascii-art rant. It almost always get's messed up in modern forum viewing. Agreed. Seems all the forums now eliminate "unneeded" spaces and screw-up ASCII "art". Given "paint" is included on any system it's not really a loss at depicting things. That said really complic...
by Mee_n_Mac
Sun Mar 08, 2015 8:42 pm
Forum: Arduino
Topic: Need help getting started
Replies: 6
Views: 590

Re: Need help getting started

@ the OP; Hmmm, about the timings you have in your post. Can you explain the reasoning behind them ? My 1'st guess at this would have been to have a min ON time (enough to be seen as on) followed by a variable OFF time. The OFF time then decreasing until it's zero and the brake light is on 100% of t...
by Mee_n_Mac
Sun Mar 08, 2015 2:30 pm
Forum: Arduino
Topic: Pulling 555 timer reset line low
Replies: 10
Views: 1175

Re: Pulling 555 timer reset line low

Valen wrote:That ascii art drawing doesn't make sense.
No it doesn't but from the verbal description pins 4 and 12 are meant to be tied to the center of the voltage divider.

Or so I thought ... :o :shock: :twisted:
by Mee_n_Mac
Sat Mar 07, 2015 9:42 pm
Forum: Arduino
Topic: Need help getting started
Replies: 6
Views: 590

Re: Need help getting started

I need a little nudge in the right direction. I'm writing a program to flash a brake light for 4 seconds. The flash rate will increase until it goes steady ON. The flash rate sequence is simple and I have it working. Brakes applied----light flash sequence begins, 4 seconds to steady ON. Brakes rele...
by Mee_n_Mac
Sat Mar 07, 2015 9:30 pm
Forum: Arduino
Topic: How to use the arduino breadboard syb 46?
Replies: 5
Views: 1091

Re: How to use the arduino breadboard syb 46?

It looks to me to be a common solderless breadboard.
https://learn.sparkfun.com/tutorials/ho ... breadboard
Am I missing something obvious ?
by Mee_n_Mac
Fri Mar 06, 2015 1:15 pm
Forum: Projects
Topic: LittleBits custom build: Wiring simple 3.5mm audio output
Replies: 1
Views: 254

Re: LittleBits custom build: Wiring simple 3.5mm audio outpu

It looks to me like I need the LittleBits perf board to then solder a dedicated output onto. I've dug around on SparkFun and I've found this simple 3.5mm audio jack and this breakout board for it. But do I need the breakout board if I'm using the LittleBits Perf module? Strictly speaking you don't ...
by Mee_n_Mac
Fri Mar 06, 2015 11:45 am
Forum: Arduino
Topic: Basic circuit questions
Replies: 2
Views: 379

Re: Basic circuit questions

1. My understanding is that electricity flows in a circuit (which is a loop) from the negative terminal (pin 13?) to the positive terminal (5v pin?). Just wanted to address this point, because of the way current flow is defined, it might be confusing to you to read more. The actual flow of electron...
by Mee_n_Mac
Thu Mar 05, 2015 10:29 pm
Forum: Projects
Topic: ADXL345 Digital Inclinometer
Replies: 3
Views: 763

Re: ADXL345 Digital Inclinometer

I have no idea how you have any good, let alone "solid", communications over I2C w/o any pull-ups. IIRC some thing like 4.7k is standard, though exact values aren't critical w/most buses. In your case that would be to 3.3v. And hope that the 5v Ardunio will recognize 3.3v as a logic HIGH. You might ...
by Mee_n_Mac
Thu Mar 05, 2015 9:55 pm
Forum: New Product Ideas
Topic: 3D Rail for Time Lapse
Replies: 3
Views: 1316

Re: 3D Rail for Time Lapse

HaD had a variety of "solutions" for this highlighted at their site. It really comes down to how much you want to spend. My concept would be based on a monorail (though perhaps a ski chairlift is closer), w/the cam suspended below the rail on a pan/tilt platform. Put a 3D accel on the platform to gi...