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19 Sep 2014

simple-design2

by teklalabs.org:

A magnetic stirrer uses a rotating magnetic field to mix fluid samples, such as buffers and media for growing bacteria. Since only a small magnet bar has to be put inside the sample/fluid, the risk of contamination is minimized. For protein purification, overnight sample dialysis steps often utilize magnetic stirrers.

Below are beta release DIY instructions for a magnetic stirrer this summer, courtesy of Malcolm Watts and Massey University in New Zealand. The stirrer runs of off a battery and has multiple speed settings.
You can also download the pdf: magnetic_stirrer_betarelease_V01

Magnetic Stirrer  - [Link]

18 Sep 2014

fpga_servo-stepper-600x470

Trandi blogged about his RC servo and stepper motor project. He writes:

For those interested in reproducing this example:
The board is called “EP2C5 Mini Board” and has a EP2C5T144C8 Cyclone II FPGA on it
I used a standard, 9grams micro RC Servo
I used a 28BYJ-48 stepper motor and it’s driver (you can purchase these as a bundle for very cheap on dealextreme or banggood)
I used the free edition of Quartus II from Altera, version 13.0 SP 1 (be careful, later versions do not support Cyclone II FPGAs anymore)
I created a simple project, pasted all this code as a single module (it would of course be cleaner to separate the RC Servo and stepper control code into independent modules)
made the “Top level entity” in the General configuration page equal to “counter” (the name of my module)
used the Pin Planner to assign the inputs/outputs as follows:

[via]

FPGA : RC Servo and Stepper motor control in Verilog - [Link]

14 Sep 2014

Electrostatic_motor

by elektor.com:

Conventional electric motors rely on the forces of electro magnetism to provide motion. An item in the UW-Madison news letter announced that a motor is under development at the headquarters of C-Motive Technologies which uses the force of electric fields.

According to Dan Ludois, an assistant professor of electrical and computer engineering at the UW and co-founder of C-Motive Technologies “We have proven the concept of a new motor that uses electric fields rather than magnetic fields to transform electricity into a rotary force, the distinction may sound minor, but it could solve a number of practical problems while saving money”

An Electrostatic Motor - [Link]

6 Sep 2014

servo_header

Ondřej Karas of DoItWireless writes:

We described simple method, how to drive modellers servo. Today, we are going to try to drive this servo from potentiometer connected to TR module ADC. It is reaction to forum thread where is discussion about airplane model control possibility.

[via]

Wireless servo controller II - [Link]


5 Sep 2014

If you’re into electronics, engineering and making things move, you’ll need a good handle on electric actuators. Use this beginner’s guide to electric actuators before you set out to purchase your first actuator.

What is An Actuator?

Before linear electric actuators were around, the only way to make a robot move forward was to use rotary actuators. Linear actuators changed all that. When it comes to electric actuators, you’ve got two main choices: lead screw and ball screw. You’ve really got a ton of choices, like peizo-electric, and there are a ton of innovations happening right now, but for this article, we’ll stick to the basics.

Lead Screw Actuators

Lead screw actuators use a threaded lead screw and a nut to create motion. The gear system runs, turning the screw moving it along the nut.

Here’s a quick diagram to illustrate the idea.

1

Read the rest of this entry »

22 Aug 2014

84b1e367171b964b3a32e3b3d3d10bfa_large

by Arc Robotics:

There have been a lot of amazing projects come out of the Maker revolution, however, many are limited by the capability of their motor controller. We want to change that. The Arc-Controller is a bridge to bring high Amp motor control to your projects, up to 43 amps with a heat sink. It is capable of variable speed and direction control over a single Stepper Motor or two DC motors, because when do you only need one motor.

The Arc-Controller is compatible with about any Arduino, or other micro controller such as Raspberry Pi. It runs an ATMega328, and is user programmable via the Arduino IDE. Thanks to the ATMega the Arc Controller can run as a standalone micro controller or be slaved by any other device. Giving Makers the ability to push the limits of what has been done and change the power to change the world.

43 Amp Arduino Motor shield, the Arc-Controller - [Link]

15 Jul 2014

12f675pulse

by cuteminds.com:

Everytime we need to test a stepper motor controller we have to connect it to the parallel port of the computer or to a function generator to obtain the necessary pulses the realize the movements of the stepper.

This is a quicker method to check a controller integrity. Simply to make the life easier here is a square wave signals generator. A potentiometer or a trimmer regulates the pulse generation of the 12F675 microchip (a square wave, between 20 hz and 3khz). Ok, there are thousands of different ways to create a pulse generator, but we had a lot of microcontrollers.

12F675 pulse generator - [Link]

18 Jun 2014

FI881D5HQDLZ0Z5.MEDIUM

aldricnegrier @ instructables.com writes:

The objective of this instructable is to guide your way throw the entire making process of building a BuildersBot machine. An Arduino controlled CNC Router that can also perform 3D printing.

The instructions will cover all areas such as, mechanics, electronics and software.

Arduino Controlled CNC / 3D Printer - [Link]

10 Jun 2014

motor-speed-control-arduino

praveen @ circuitstoday.com writes:

PWM or pulse width modulation is a very common method used for controlling the power across devices like motor, light etc. In PWM method the power across the load is controlled by varying the duty cycle of the drive signal. More the duty cycle more power is delivered across the load and less the duty cycle, less power is delivered across the load. A hex keypad is used for controlling the speed. The speed can be varied in seven steps using the hex keypad. Arduino UNO is the type os arduino development board used in this circuit. The circuit diagram of the PWM motor speed control using arduino is shown in the figure below.

PWM motor speed control using Arduino - [Link]

2 Jun 2014

FQNGSO4HSPP6D5H.MEDIUM

Trochilidesign @ instructables.com writes:

This Instructable will show you how I built my CNC milling machine. I know a lot of CNC dreamers do not have the knowledge or tools to build a full metal machine. I still think and hope this Instructable inspires you to make your own machine. I include all of the necessary steps I went through in designing and building this CNC milling machine. All of the drawings I used to build my machine will be available.

Building your own CNC router/milling machine - [Link]



 
 
 

 

 

 

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