Posts with «magnet» label

Flying the Friendly Skies with A Hall Effect Joystick

There are plenty of PC joysticks out there, but that didn’t stop [dizekat] from building his own. Most joysticks mechanically potentiometers or encoders to measure position. Only a few high-end models use Hall effect sensors. That’s the route [dizekat] took.

Hall effect sensors are non-contact devices which measure magnetic fields. They can be used to measure the position and orientation of a magnet. That’s exactly how [dizekat] is using a trio of sensors in his design. The core of the joystick is a universal joint from an old R/C car. The center section of the joint (called a spider) has two one millimeter thick disc magnets glued to it. The Hall sensors themselves are mounted in the universal itself. [Dizekat] used a small piece of a chopstick to hold the sensors in position while he found the zero point and glued them in. A third Hall effect sensor is used to measure a throttle stick positioned on the side of the box.

An Arduino micro reads the sensors and converts the analog signal to USB.  The Arduino Joystick Library by [Matthew Heironimus] formats the data into something a PC can understand.

While this is definitely a rough work in progress, we’re excited by how much [dizekat] has accomplished with simple hand tools and glue. You don’t need a 3D printer, laser cutter, and a CNC to pull off an awesome hack!

If you think Hall effect sensors are just for joysticks, you’d be wrong – they work as cameras for imaging magnetic fields too!

Hack a Day 18 Jan 09:00

Tertiarm - low cost, 3d printed robot arm based on Ikea lamp

Primary image

What does it do?

Move things, push buttons, etc.

Cost to build

Embedded video

Finished project

Complete

Number

Time to build

Type

URL to more information

Weight

read more

Let's Make Robots 07 Feb 15:54

Tertiarm - low cost, 3d printed robot arm based on Ikea lamp

Primary image

What does it do?

Move things, push buttons, etc.

Cost to build

Embedded video

Finished project

Complete

Number

Time to build

Type

URL to more information

Weight

read more

Let's Make Robots 07 Feb 15:54

Tertiarm - low cost, 3d printed robot arm based on Ikea lamp

Primary image

What does it do?

Move things, push buttons, etc.

Cost to build

Embedded video

Finished project

Complete

Number

Time to build

Type

URL to more information

Weight

read more

Let's Make Robots 07 Feb 15:54

Newton’s Cradle for Those Too Lazy to Procrastinate

Desk toys are perfect for when you don’t want to work. There’s a particularly old desk toy called the Newton’s cradle. If you don’t know the name, you’d still recognize the toy. It is some ball bearings suspended in midair on strings. If you pull back, say, two balls and let them swing to impact the other balls, the same number of balls on the other side will fly out. When they return, the same number will move on the other side and this repeats until friction wears it all down.

We think [JimRD] might be carried away on procrastination. You see, he not only has a Newton’s cradle, he has automated it with an Arduino. According to [Jim], this is his third attempt at doing so. You can see the current incarnation in the video, below.

There are two servos. One pulls back the balls and releases them and the other stops the balls in anticipation of the next operation. The servo that pulls the balls back is clearly magnetic. At first, we thought it was an electromagnet and that deenergizing it released the balls. That’s not the case. Instead, the servo arm has a permanent magnet, but foam decouples it from the ball so that if the arm pulls far enough away, the ball can escape.

Because of the differences in magnets, ball bearings, and other factors, if you try to duplicate this, you’ll probably have to experiment a little with the angles and speeds in the code. The ball stop servo is probably unnecessary, as long as you don’t mind waiting for the thing to wind down on its own.

If you don’t have a cradle, you could always make one yourself. We’d probably avoid using light bulbs, though.


Filed under: Arduino Hacks

Arduino Stroboscope Animation





UPDATE: Magzor has just started a Kickstarter campaign. Please check it out to get a good package deal on many of their components. Many of which were used in this tutorial.
 
This tutorial will show you how to build your own Stroboscopic Animator using Magzor's Mechanotronic Design Portal as a starting point. Magzor Corporation is a business in California that is trying really hard to simplify robotic design. They want to enable users with little to no engineering experience to design and manufacture a custom robot by themselves in a matter of hours.
What is a stroboscope? A stroboscope is an instrument that uses a strobe light to make a moving object look stationary… We will use this feature to create an interesting 4 picture animation on a rotating disk.

 

 
Have a look at the video below to see the project in action, and the MDP process walk-through:


 

Video




 
 

Parts Required:





 

Magzor Schematic Diagram

Click to zoom ...

 
Further build instructions can be obtained by selecting the components in the Mechanotronics Design Portal within the Magzor website. Generating the build, and then selecting "Setup Instructions" tab at the top of the page. See video above to see this process in action.
 
 

Arduino Sketch


Make sure to copy and paste the following code into your Arduino IDE. It doesn't seem to work directly from the browser. You also need to install the Arduino Magzor I2C library ( http://magzor.com/downloads/ )



 

Putting it together


 
Arduino MEGA


 
Magzor I2C board


 
MIC Boards


 
MIC Boards Assembled


 
Sensors, Modules and Shields - all put together


 
Motor with Bracket and Wire


 
Picture lined up with magnet on disk


 

Stroboscopic Animation



 


 


The Arduino MEGA microcontroller listens for the hall effect sensor to be triggered by the south facing side of the magnet on the underside of the rotating disk. As the magnet moves over the hall effect sensor, the sensor is triggered and the Arduino instructs the LED to blink for a fraction of a second. By manipulating the delay after the trigger time, we can get the LED to blink when one of the four images on the rotating disk is towards the front position. And if we get the timing right, we can make a simple animation.
 
If you watch the video above, you will see that the image bounces around a little bit. The duration of each frame is determined by the speed of the rotating disk (or motor), and the number of LED flashes per frame. Any changes in rotation speed will affect the position of the picture when the LED blinks. My rotating disk is not completely semetrical or centred correctly, and therefore a bit jumpy… but you get the idea. Bold images with high contrast seem to work best… Precision is key for this type of project. And if you can get the disk to rotate at a constant speed, you could probably do away with the hall effect sensors and magnets… however, in my case, these were essential in getting the project to work as intended.
 
This project is a lot of fun. You can really get creative by making your own pictures or 3 dimensional models (for a stop motion effect). Try different colours. It really is quite cool.



Concluding Comments


I would like to thank Magzor for supplying the components used in this tutorial, and letting me try out their MDP process. I really like the concept, the one stop shop which looks after you from beginning to end. Providing everything I needed to get the project off the ground. The point of this exercise was to go through the entire process of selecting the parts, build the project, and get it up and running. And I have done that in no time at all.
 
There is only one library to download and install, and the good thing is that you don't have to go hunting for it. The latest "correct" working version of the library is easy to find, right there on the Magzor website… Speaking of the Magzor website, please make sure to take a quick look around. It is quite impressive.
 
  UPDATE: Magzor has just started a Kickstarter campaign. Please check it out to get a good package deal on many of their components. Many of which were used in this tutorial.





If you like this page, please do me a favour and show your appreciation :

 
Visit my ArduinoBasics Google + page.
Follow me on Twitter by looking for ScottC @ArduinoBasics.
I can also be found on Pinterest and Instagram.
Have a look at my videos on my YouTube channel.


 
 
             

This project would not have been possible without the collaborative effort from Magzor Corporation.
Please visit their site and check out the MDP.



However, if you do not have a google profile...
Feel free to share this page with your friends in any way you see fit.

Arduino Stroboscope Animation


This tutorial will show you how to build your own Stroboscopic Animator using Magzor's Mechanotronic Design Portal as a starting point. Magzor Corporation is a business in California that is trying really hard to simplify robotic design. They want to enable users with little to no engineering experience to design and manufacture a custom robot by themselves in a matter of hours.

What is a stroboscope? A stroboscope is an instrument that uses a strobe light to make a moving object look stationary… We will use this feature to create an interesting 4 picture animation on a rotating disk.

 


 
Have a look at the video below to see the project in action, and the MDP process walk-through:


 

Video



 
 

Parts Required:


 

Magzor Schematic Diagram

Click to zoom ...

 

Further build instructions can be obtained by selecting the components in the Mechanotronics Design Portal within the Magzor website. Generating the build, and then selecting "Setup Instructions" tab at the top of the page. See video above to see this process in action.
 
 

Arduino Sketch


Make sure to copy and paste the following code into your Arduino IDE. It doesn't seem to work directly from the browser. You also need to install the Arduino Magzor I2C library ( http://magzor.com/downloads/ )


 

Putting it together


 

Arduino MEGA


 

Magzor I2C board


 

MIC Boards


 

MIC Boards Assembled


 

Sensors, Modules and Shields - all put together


 

Motor with Bracket and Wire


 

Picture lined up with magnet on disk


 

Stroboscopic Animation


 

The Arduino MEGA microcontroller listens for the hall effect sensor to be triggered by the south facing side of the magnet on the underside of the rotating disk. As the magnet moves over the hall effect sensor, the sensor is triggered and the Arduino instructs the LED to blink for a fraction of a second. By manipulating the delay after the trigger time, we can get the LED to blink when one of the four images on the rotating disk is towards the front position. And if we get the timing right, we can make a simple animation.
 
If you watch the video above, you will see that the image bounces around a little bit. The duration of each frame is determined by the speed of the rotating disk (or motor), and the number of LED flashes per frame. Any changes in rotation speed will affect the position of the picture when the LED blinks. My rotating disk is not completely semetrical or centred correctly, and therefore a bit jumpy… but you get the idea. Bold images with high contrast seem to work best… Precision is key for this type of project. And if you can get the disk to rotate at a constant speed, you could probably do away with the hall effect sensors and magnets… however, in my case, these were essential in getting the project to work as intended.
 
This project is a lot of fun. You can really get creative by making your own pictures or 3 dimensional models (for a stop motion effect). Try different colours. It really is quite cool.


Concluding Comments


I would like to thank Magzor for supplying the components used in this tutorial, and letting me try out their MDP process. I really like the concept, the one stop shop which looks after you from beginning to end. Providing everything I needed to get the project off the ground. The point of this exercise was to go through the entire process of selecting the parts, build the project, and get it up and running. And I have done that in no time at all.
 
There is only one library to download and install, and the good thing is that you don't have to go hunting for it. The latest "correct" working version of the library is easy to find, right there on the Magzor website… Speaking of the Magzor website, please make sure to take a quick look around. It is quite impressive.



If you like this page, please do me a favour and show your appreciation :

 
Visit my ArduinoBasics Google + page.
Follow me on Twitter by looking for ScottC @ArduinoBasics.
I can also be found on Pinterest and Instagram.
Have a look at my videos on my YouTube channel.


 
 
             

This project would not have been possible without the collaborative effort from Magzor Corporation.
Please visit their site and check out the MDP.



However, if you do not have a google profile...
Feel free to share this page with your friends in any way you see fit.

3D Print Your Own Stepper Motor

Learn how one Maker created his own stepper motor using a 3D printer, an Arduino, and a few materials picked up from the hardware store.

Read more on MAKE

The post 3D Print Your Own Stepper Motor appeared first on Make: DIY Projects, How-Tos, Electronics, Crafts and Ideas for Makers.

Visualizing the unique processes of human brain with magnets and liquids

Solaris is an interactive installation created by Julia Borovaya (idea curation), Edward Rakhmanov (robotic system, chemistry), Vtol (programming, electronics) with the help of Alexander Kaplan, professor of neurophysiology:

it demonstrates the field influence of the permanent magnet on the magnetic and spirit (fluorescent) liquids. Two liquids constitute the diphasic system. Due to liquids movements and their surfaces’ modifications we visualize the unique processes of human brain. The spectator wears on neuro interface Emotive Epoc, the device computes a brain activity and sends information to the installation machinery.

To test the project people of different ages, social groups and professional areas were invited. Test results confirmed that brain activity and mood of the man reflect on the dynamic and character of liquids movements in the sphere. Object reacts on the changes of mind and emotion states. People who spent a plenty of time with the object managed to influence the dynamic and direction of the liquids on the unconsciousness level. We also reveal that the installation visualizes the temperament of the person. The object copies your mental organization and echoes it on the liquid’s surface. The object becomes a part of the participant.

It runs on Arduino Uno controlling dc motors, 2 actuators and a custom digital motor control system interface.

Arduino Blog 24 Sep 23:11

Hacking grandfather clock accuracy while it’s still ticking

[Keith] got his hands on a few grandfather clocks. Apparently the price tag is greatly reduced if you are able to get them second-hand. The mechanical timepieces require weekly winding, which is a good thing since you’ll also need to correct the time at least that often. But this drift got [Keith] thinking about improving the accuracy of these clocks. He figured out a high-tech way to adjust the timepiece while it’s ticking.

The first thing he needed was a source of super-accurate time. He could have used a temperature compensated RTC chip, but instead went the more traditional route of using the frequency of mains power as a reference. The next part of the puzzle is to figure out how to both monitor the grandfather clock and make small tweaks to its pendulum.

The answer is magnets. By adding a magnet to the bottom of the pendulum, and adjusting the proximity of a metal plate positioned below it, he can speed up or slow down the ticking. The addition of a hall effect sensor lets the Arduino measure the rate of each swing and calculate the accuracy compared to the high voltage frequency reference.


Filed under: clock hacks