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Re: My first 3d-printed model

 by Mee_n_Mac ¦  Mon Feb 16, 2015 10:06 pm ¦  Forum: Forum ¦  Topic: My first 3d-printed model ¦  Replies: 3 ¦  Views: 1559

It's really a cheap 3D printer, I just want to make some 3D models, so i'm looking for one with poor budget :? . Is it easy to assemble? It's not so hard to assemble. For the machanical idiot like me, I spent about 3hours. As time goes by please post (I'm not sure where) your good and bad experienc...

Re: Connecting two modules running at different baud rates

 by Mee_n_Mac ¦  Mon Feb 16, 2015 6:15 pm ¦  Forum: Projects ¦  Topic: Connecting two modules running at different baud rates ¦  Replies: 3 ¦  Views: 602

Just to amplify what jr said above. Those type RF modules are very very basic and don't include a lot of the functions "higher end" RF modules do. That said they still work for simple things. Several of those functions, that the VW library (or it's replacement) does, is summed up on this line from t...

Re: Simple circuit help for COMPLETE noob

 by Mee_n_Mac ¦  Mon Feb 16, 2015 5:41 pm ¦  Forum: Forum ¦  Topic: Simple circuit help for COMPLETE noob ¦  Replies: 9 ¦  Views: 2540

What is making the sound ? What kind of signal does it need to enable and disable a sound ? Do you have a range for the value of n ? Do you have a particular motion detector in mind ? Is this to be battery powered or run off whatever powers the sound box or ?? Depending on the answers to the above y...

Re: TSL2561 Sketch Error Message

 by Mee_n_Mac ¦  Mon Feb 16, 2015 5:19 pm ¦  Forum: Arduino ¦  Topic: TSL2561 Sketch Error Message ¦  Replies: 9 ¦  Views: 1156

I looked at .CPP file and it looks to do everything correctly. It uses doubles to store the variables, same as a float on an Uno. I'm not sure how to explain what you saw. Does that happen all the time at that light intensity ? I note your values in the printout above look OK. If it's repeatable I m...

Re: TSL2561 Sketch Error Message

 by Mee_n_Mac ¦  Sun Feb 15, 2015 5:51 pm ¦  Forum: Arduino ¦  Topic: TSL2561 Sketch Error Message ¦  Replies: 9 ¦  Views: 1156

Hmmm, that would seem to be a mystery. Let me look at the datasheet and see what I can see.

ps - I can only wish that more posts were as well formatted and as data inclusive as yours.

Re: TSL2561 Sketch Error Message

 by Mee_n_Mac ¦  Sun Feb 15, 2015 12:02 pm ¦  Forum: Arduino ¦  Topic: TSL2561 Sketch Error Message ¦  Replies: 9 ¦  Views: 1156

W/o the code to look at, I'll guess that you need to use floating point math and aren't for some reason. Was the final variable declared as a type float ?

Re: character LCD on usb

 by Mee_n_Mac ¦  Sun Feb 15, 2015 12:47 am ¦  Forum: Projects ¦  Topic: character LCD on usb ¦  Replies: 9 ¦  Views: 922

Yup, IIRC there was an article on HaD, not more than a year ago, where someone had put an ATtiny on a PCB that plugged into a USB port. Upon boot it did "stuff".

Re: TSL2561 Sketch Error Message

 by Mee_n_Mac ¦  Sat Feb 14, 2015 1:42 pm ¦  Forum: Arduino ¦  Topic: TSL2561 Sketch Error Message ¦  Replies: 9 ¦  Views: 1156

Re: Rapid PCB Printer

 by Mee_n_Mac ¦  Fri Feb 13, 2015 10:05 am ¦  Forum: Forum ¦  Topic: Rapid PCB Printer ¦  Replies: 3 ¦  Views: 1703

The downfall of these type of printers is generally the resistance (and cost) of the ink. They claim a sheet resistance of 12 mOhms, which is better than most. I guess we'll see.

I'm still thinking about how to make a DIY MultiWire "printer".

Re: Arduino Autopilot Help to add GPS

 by Mee_n_Mac ¦  Thu Feb 12, 2015 9:05 pm ¦  Forum: SparkFun Product Questions ¦  Topic: Arduino Autopilot Help to add GPS ¦  Replies: 198 ¦  Views: 23421

boatbandit2 wrote:Well I think I have found the problem the compass is not reading any change of heading at times? I have it on 292.10 degrees and rotate the kontiki 180 degrees and I still have the same reading of 292.10 degrees.
That's odd ?!?!

Why is the loop counter in your data always 0 ?

Re: Self balancing skateboard

 by Mee_n_Mac ¦  Thu Feb 12, 2015 8:59 pm ¦  Forum: Projects ¦  Topic: Self balancing skateboard ¦  Replies: 47 ¦  Views: 6562

Almost sounds like forward and reverse were on at the same time. That'll short the H bridge and smoke it real quick.

Re: Motor + motor shield selection

 by Mee_n_Mac ¦  Thu Feb 12, 2015 2:10 pm ¦  Forum: SparkFun Product Questions ¦  Topic: Motor + motor shield selection ¦  Replies: 8 ¦  Views: 784

With a counterweight, gravity is no longer fighting the motor as it tries to winch up the load. Now just about any motor will work, all it has to do (neglecting friction, etc) is overcome the inertia of the load and counterweight. The load will continue to accelerate until it hits the stops (or in r...

Re: Motor + motor shield selection

 by Mee_n_Mac ¦  Thu Feb 12, 2015 12:25 pm ¦  Forum: SparkFun Product Questions ¦  Topic: Motor + motor shield selection ¦  Replies: 8 ¦  Views: 784

The plot below is from the spreadsheet mentioned above. In it I played w/the stall torque and no load (max) RPM of a hypothetical gearmotor, eventually settling on 2.0 N m and 250 RPM to achieve a "reasonable" time to lift your 10 kg load vertically a distance of 0.5 m (~19+ in). The simulation pred...

Re: Motor + motor shield selection

 by Mee_n_Mac ¦  Wed Feb 11, 2015 10:27 pm ¦  Forum: SparkFun Product Questions ¦  Topic: Motor + motor shield selection ¦  Replies: 8 ¦  Views: 784

First let me say that I think my calcs above are dependent on my understanding that a kg of weight is really 9.81 N of force here on the Earth's surface. So 1 kg of weight is also 1 kg of mass. We've not talked about real life torque vs RPM curves. Depending on what the stated torque spec is (is it ...

Re: Motor + motor shield selection

 by Mee_n_Mac ¦  Tue Feb 10, 2015 10:23 pm ¦  Forum: SparkFun Product Questions ¦  Topic: Motor + motor shield selection ¦  Replies: 8 ¦  Views: 784

FWIW you could also have approached this problem as a physics student, vs a mechanical engineer. That student would ask how much work (how much energy) would it take to lift a 10 kg mass straight up 0.5 m (~20") in a 1 G field ? He might have then asked how much power is needed to do it in 2 secs ? ...

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