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Re: What would I need to measure level?

 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: 374

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) ?

Re: Battery Powered Push Buttons with Unique Identifiers

 by Mee_n_Mac ¦  Tue Mar 10, 2015 8:40 pm ¦  Forum: Projects ¦  Topic: Battery Powered Push Buttons with Unique Identifiers ¦  Replies: 3 ¦  Views: 491

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" ...

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

 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: 377

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.

Re: Series/parallel batteries

 by Mee_n_Mac ¦  Mon Mar 09, 2015 1:08 pm ¦  Forum: Projects ¦  Topic: Series/parallel batteries ¦  Replies: 4 ¦  Views: 718

A DPDT wired this way. You can probably find one w/a center off position as well.

DPDT_switched_batts.jpg

Re: How to use the arduino breadboard syb 46?

 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: 1140

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...

Re: Need help getting started

 by Mee_n_Mac ¦  Sun Mar 08, 2015 9:36 pm ¦  Forum: Arduino ¦  Topic: Need help getting started ¦  Replies: 6 ¦  Views: 611

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...

Re: Pulling 555 timer reset line low

 by Mee_n_Mac ¦  Sun Mar 08, 2015 8:50 pm ¦  Forum: Arduino ¦  Topic: Pulling 555 timer reset line low ¦  Replies: 10 ¦  Views: 1288

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...

Re: Need help getting started

 by Mee_n_Mac ¦  Sun Mar 08, 2015 8:42 pm ¦  Forum: Arduino ¦  Topic: Need help getting started ¦  Replies: 6 ¦  Views: 611

@ 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...

Re: Pulling 555 timer reset line low

 by Mee_n_Mac ¦  Sun Mar 08, 2015 2:30 pm ¦  Forum: Arduino ¦  Topic: Pulling 555 timer reset line low ¦  Replies: 10 ¦  Views: 1288

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:

Re: Need help getting started

 by Mee_n_Mac ¦  Sat Mar 07, 2015 9:42 pm ¦  Forum: Arduino ¦  Topic: Need help getting started ¦  Replies: 6 ¦  Views: 611

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...

Re: How to use the arduino breadboard syb 46?

 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: 1140

It looks to me to be a common solderless breadboard.
https://learn.sparkfun.com/tutorials/ho ... breadboard
Am I missing something obvious ?

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

 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: 269

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 ...

Re: Basic circuit questions

 by Mee_n_Mac ¦  Fri Mar 06, 2015 11:45 am ¦  Forum: Arduino ¦  Topic: Basic circuit questions ¦  Replies: 2 ¦  Views: 397

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...

Re: ADXL345 Digital Inclinometer

 by Mee_n_Mac ¦  Thu Mar 05, 2015 10:29 pm ¦  Forum: Projects ¦  Topic: ADXL345 Digital Inclinometer ¦  Replies: 3 ¦  Views: 820

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 ...

Re: 3D Rail for Time Lapse

 by Mee_n_Mac ¦  Thu Mar 05, 2015 9:55 pm ¦  Forum: New Product Ideas ¦  Topic: 3D Rail for Time Lapse ¦  Replies: 3 ¦  Views: 1356

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...

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