Robotics (Page 2)

Robot Building and Learning Robotics.

Hardware, Electronics, Supplies, Custom Engineering and Technical Assistance for the Animatronic, Robotic, Electronic Arts, Haunted Attractions, Hobbyist and Professional.

Blue Point Engineering – Animatronics Robotics

“..Product line of low cost, high quality, hardware, electronics, and supplies used in animatronics, robotics, haunted Industry and technology education for both the hobbyist and professional designers, imagineers and dreamers creating their own forms of animatronic and robotic life.”

DMX Motor Controller - Blue Point Engineering

The DMX- (Servo) Motor controller allows DC motors to be controlled over a standard DMX system. The board may be configure to drive the DC motor simply as a variable speed, reversible motor or with the addition of a position feed back potentiometer, to create a powerful servo motor controller for accurate positioning purposes.

Blue Point Engineering LLC – BPE Solutions
Longmont, . Colorado .USA

“For measuring distances I chose to use SRF08. It is an ultrasonic ranger with I2C bus and measure range from 3 cm to 6 m. The sensor has a beam width of 55 degrees (-6 dB points) and when mounted on top of one of the servos it can be used for covering well over 180 degrees.”

BeagleBot – Beagle powered robot – A small experimental robot with Beagle Board as it’s heart.

Servo System -Double Hitec HS-422 servos mounted on a special two axis brackets. – 5 pcs of normal RC servos with 50 Hz PWM control. ATMega16 at the expansion board creates the PWM for all of the servos and provides an I2C control interface for them. User space application running on beagle board can thus control the servos just sending only a simple I2C message.

BeagleBot - Beagle powered robot

“The Beagle Board is a low-cost, fan-less single-board computer based on Texas Instruments OMAP35x processors featuring the ARM Cortex-A8 core”

The USB-powered Beagle Board is a low-cost, fan-less single board computer that unleashes laptop-like performance and expandability without the bulk, expense, or noise of typical desktop machines.

Beagle Board – Create Open Embedded Devices

The BeagleBoard.org Foundation is a US-based non-profit corporation existing to provide education in and promotion of the design and use of open-source software and hardware in embedded computing.

An accelerometer is a device that measures non-gravitational accelerations. These are accelerations produced by mechanically accelerating the accelerometer via its casing. – Accelerometer Wikipedia

Accelerometers in Electronics

Sci-Spot.com – Accelerometer – An accelerometer is a device which measures acceleration; how fast it’s speeding up. In the past an accelerometer could be a complex, bulky piece of equipment, but in
today’s world, accelerometers are available as single ic’s and use complex microscale machining technology.

MMA7260Q is a 3-axis accelerometer from Freescale Semiconductor. This accelerometer can be used with an extension Library Mma7260q which simplifies some initialization values and tilt detection.

ADXL105 Lower-Noise Wider-Bandwidth Accelerometer – The ADXL105, a near-ideal kind of vibration sensor, eliminates significant problems with existing vibration sensors, such as piezoelectric and bulk capacitive sensors. Primary benefits derive from much lower cost, stable sensitivity as a function of frequency and temperature, ruggedness, and ease of use. Besides machine health and condition monitoring, it is particularly well suited for noise and vibration cancellation applications.

Read Full page at – Accelerometers in Electronics

Need some help here. I want to build a cheap wheel encoder by myself. Now, my idea was to use a photodiode and a LED. What i don’t know is how to use the output from photodiode to put on a GPIO on my MCU board. Do i need some resistors or something. Aaaa, i need a high level of 5V for my GPIO. I

Read More at my page – I want to build a cheap wheel encoder by myself.

Answer

Please study Links Below

Optical Encoder Project – “Many years ago, I competed in MASLab, an MIT competition to build an autonomous robot. A year or two after that, I was on the MASLab staff, helping prepare the hardware for the year’s competition. One of the projects I worked on was an optical encoder.”

About Encoders and How to Make an Encoder Wheel

“A typical encoder uses optical sensor(s), a moving mechanical component, and a special reflector to provide a series of electrical pulses to your microcontroller. These pulses can be used as part of a PID feedback control system to determine translation distance, rotational velocity, and/or angle of a moving robot or robot part.”

Make your own rotary encoder

Make your own rotary encoder

“In the first and second post of this series you saw the basics of how to use photointerrupters. Now it’s time for practice. We make a rotary encoder. Here we take a single photointerrupter that gives us the pulses we can count.”

Make Your Own Encoders chat – “I’m starting a┬Ědedicated┬Ěthread on the specific encoders I used on my Homebuilt platform. I had great results. A word about the encoder disks: they must be mounted PERFECTLY to achieve consistency. Perfectly flat, true, and concentric.

Incremental Optical Encoders

Here is a method for making an encoder with two sensors for your application. If you only need speed sensing, you may want to skip down to the construction section. The important variables are the radius of the circle (r), the distance between the two optical sensors (s), and the number of divisions in the wheel (d). …..

Incremental Optical Encoders

Ananth –

Use a photointerrupters, even from an old wheel mouse if you want or build one. Then you need a Wheel with stripes and a Schmitt Trigger Gate or Comparator

First have a look at this How to Build a Robot a BeetleBot. This sparked the long lost memory of a book i read around 35 years back. My age was in single digits. This was when i had neither an idea of electronics or could afford any parts.

I had built many physics projects like weighing scale, gramophone, telegraph system, crystal radio. I will try to explain these later. Calling bells, gears and magnets from the flea markets my source of electricity & magnetism.

Beetle Robot guided by Light
I read a hobby book from UK for children. It was a Beetle Car Bot, with four wheels and 4 light sensors. It could be LDR or photo-transistors, i do not remember. The light sensors were at the four corners of the car. The maneuvering was by variation in the speed of each wheel. It was based on germanium transistors mostly.

Four large lamps like 40W, had to be mounted on the ceiling, at the four corners of the room. By turning on and off these lights, this bot could go anywhere in the room. The whole book with pictures was dedicated to one bot and how-to build one.

Now that we have PIC and AVR; we can use Dimmable LED Lightning arrays to guide the bot. The challenge is in the mechanics of the bot, we have to forget that we have wireless for some time. Try this out.

If you want to build electronic circuits, you need to connect the components of your circuit somehow. If you expect to make your circuit work more than just a few times, you need a solid way of connecting them. You need to create a printed circuit board (PCB).

“I started playing with electronics as a hobby when I was 14. Since then I have finished a Master’s degree and founded two electronic design companies.”

Build Electronic Circuits Like a Pro

Radar Circuit

The radar sensor uses a Ultra-Wideband (UWB) chip from Novelda. It sends out electromagnetic pulses and analyzes the pulses that are reflected back. In the video above, a part of the electromagnetic pulse will be reflected back when it hits the wall and a part of it penetrates the wall and is reflected from the cabinet behind the wall.

Radar Circuit Enables See-through Wall Robot

delabs – This is a nice Educational Website built by Oyvind from Norway. Only when we read and learn from the experience and views of others, our brain opens up to new ideas and we develop a wide perspective.

OpenServo is an open community-based project started by Mike Thompson. Low-cost digital servo for robotics being the goal. New code and hardware.

OpenServo – Digital servo for Robotics

OpenServo - Digital servo for Robotics

Independent H-Bridge allowing for braking, Temperature sensor, 400khz I2C/TWI interface. – New Features

Some features:

  • High precision positioning
  • Advanced curve based motion profile engine
  • Open source design and software
  • Back EMF speed sensing
  • High speed 20MHZ design