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1  Products / The Arduino Starter Kit / Re: Arduino Starter Kit Servo Problem on: May 19, 2013, 01:09:21 am
It's fritzing.org
2  Topics / Robotics / Re: Micro Robot Arm: Question about arm joints on: May 17, 2013, 03:13:30 pm
Wow!

Can I ask how long it takes to make stacks like that?

Thank you! It all depends on the depth of the stack - a 300 image stack might take me anything upwards of 8 hrs or so, preparation (1hr), shooting (2 hr), stacking & substacking (4 hr), postprocessing (1 hr). Example below for those who don't have the first clue what this talk of stacking is all about, not an especially deep stack.

In fact my entire Arduino adventure is for this, my aim is to build a universal stage driven by motors inside a Peltier chamber. Hence the need for small but torquey motors smiley


Extreme Hoverfly by Johan J.Ingles-Le Nobel, on Flickr
3  Topics / Robotics / Re: Micro Robot Arm: Question about arm joints on: May 17, 2013, 06:06:24 am
Hello groundfungus,

Thank you very much, that's exactly what I was thinking too. My thing needs a very steady arm driven by a motor so this would look apt. I don't suppose you happen to know of any suppliers of tiny worm gears that'll fit onto a 3mm d shaft?

Thanks again
4  Topics / Robotics / Micro Robot Arm: Question about arm joints on: May 16, 2013, 06:21:06 am
Hello,

I'm dithering between using a small stepper of a geared DC worm drive to rotate subsequent limbs of a micro robot arm (15 cm high). Can anyone point me at any reference sites or blogs which might show me some of the options for connecting the drive and gears between micro arm segments? I'm unsure whether to go for a worm drive, a bevel gearbox or if there is some other option that I'm not as yet aware of that gives highly geared rotational movement on a subsequent arm segment.

Thank you for your time
5  Using Arduino / Motors, Mechanics, and Power / Re: 28BYJ-48 question on: May 15, 2013, 10:03:07 am
Thank you MarkT
6  Using Arduino / Motors, Mechanics, and Power / 28BYJ-48 question on: May 14, 2013, 03:56:55 pm
Hello,

I've just 'graduated' from the starter kit so I'm pretty clueless, but branching out and experimenting with a few different things for a device I want to build, which includes steppers. So I bought this 28BYJ-48 stepper and hooked it up as below using the sketch below, from Adafruit. Works great!

I don't get something though, it takes an input value of 2048 to make it go round once. Can anyone explain please how this relates to its specs (Step angle: 5.625 x 1/64. Reduction ratio: 1/64) or the sketch? At Adafruit it states a value of 500 should turn it once... different motor or have I been a bit of a muppet between the sketch and the circuit somewhere?

Thank you


circuit:


sketch:
Code:
/*Adafruit Arduino - Lesson 16. Stepper*/
#include <Stepper.h>

int in1Pin = 12;
int in2Pin = 11;
int in3Pin = 10;
int in4Pin = 9;
Stepper motor(512, in1Pin, in2Pin, in3Pin, in4Pin);  

void setup()
 {  
   pinMode(in1Pin, OUTPUT);  
   pinMode(in2Pin, OUTPUT);  
   pinMode(in3Pin, OUTPUT);  
   pinMode(in4Pin, OUTPUT);  
   while (!Serial);  
   Serial.begin(9600);  
   motor.setSpeed(30);
 }
 
 void loop()
 {  
   if (Serial.available())  
   {      int steps = Serial.parseInt();    
          motor.step(steps);  
   }
 }
7  Community / Website and Forum / Re: Explorer 9, tokens and arduino.cc on: May 14, 2013, 03:00:54 pm
Ok, willdo at work. Thank you!
8  Products / The Arduino Starter Kit / Re: COMPLAINT: Starter kit components not fitting on: May 14, 2013, 11:16:44 am
Overcoming problems and problem solving are definitely part of any learning experience, but in my humble opinion a starter kit isn't the place for that. A decent starter kit should work, full stop - components should fit and illustrations should be accurate. If the instructions are out of date, add a supplementary 'update' booklet!Overlooking this, sure, the starter kit is a good introduction - I've definitely learned a lot.

But spending hours and hours, over about half the projects, wondering why completely correct circuits and sketches didn't work only to discover it was the bad breadboard design didn't add anything whatsoever. Once I bought a new breadboard all the circuits worked very quickly... much more encouraging and exciting to a beginner than stuff that doesn't work!
9  Community / Website and Forum / Explorer 9, tokens and arduino.cc on: May 14, 2013, 10:59:17 am
Hello,

I use explorer 9 at work and at home, and have many problems with the arduino site just serving up completely blank pages. This only seems to happen if "?token={xyz}" is on the URLs. But this has meant that the playground, labs and lately some of the forum has been unreachable.

Is there anything I can do my end with IE to actually see these pages. Don't bother saying use a different browser because corporate policies mean I need to.

Thank you
10  Products / The Arduino Starter Kit / Re: Arduino Starter Kit Servo Problem on: May 10, 2013, 01:17:13 pm
FV, your problem is your circuit. I just checked the sketch and it works fine!

For what it's worth, I found that remaking the circuit again a little later using comletely different positions on the board tended to solve things like this. In fact, the only problems I had completing the starter kit were physical, ie either me wiring things in the wrong way or because of badly fitting components.
Good luck!
11  Products / The Arduino Starter Kit / Re: If your components don't sit well on the breadboard, try this! on: May 09, 2013, 04:17:31 pm
Inserted a metal washer in the round hole to further support  the metal strip
stops the sag.....
Shame there's no 'like this post' button here. Great move  smiley
12  Products / The Arduino Starter Kit / Re: Project 12 (Knock Lock) on: May 03, 2013, 03:02:20 pm
I have the same
13  Products / The Arduino Starter Kit / Re: If your components don't sit well on the breadboard, try this! on: May 02, 2013, 01:49:03 pm
Sure


arduino by Johan J.Ingles-Le Nobel, on Flickr
14  Using Arduino / Motors, Mechanics, and Power / Re: Brushless motor: Why do I need an ESC? Alternatives on: May 02, 2013, 06:12:22 am
Thank you Erdin, appreciated!

Could you recommend any websites or reading that'd take me into the various types of motors and motor controllers, their advantages disadvantages etc? I'm just after some cheap and cheerful fans with speed control to drive air round some apparatus. The speed control is to control the noise as much as their output... a bit bewildered by the permutations that seem to be cropping up between h bridge, motor shields, integrated electronics, ESCs etc.

Many thanks again!
15  Using Arduino / Motors, Mechanics, and Power / Brushless motor: Why do I need an ESC? Alternatives on: May 02, 2013, 03:53:05 am
Hello,

I'm learning Arduino in order to build a specific device, which includes 4 fans to circulate air. I thought I'd use old PC fans, and replaced the motor in project 10 of the Arduino starter kit with a PC fan.

Project 10 uses an H bridge L293D to control a DC motor with a pot and 2 buttons; one to switch on/off and one to change motor direction. Pot is speed.

First thing I learned was that there are brushed and brushless motors smiley. But, it worked, which was great, but in my research this morning I've come across all sorts references that you absolutely must use an ESC to control a brushless motor. I'm perfectly happy to buy one but don't know which one to buy smiley

Can anyone shed a little light please on what the equation is I'd use to judge what sort of wattage ESC to buy?
Also, how come a brushed motor will rotate both ways but my brushless one would only go one way round? Is this related to using the wrong code and I should be using servo code to control a brushless motor?

Many thanks for your time
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