vb.net barcode reader from image Power Supply Regulator (as Needed) Output Laser Diode Optical Fiber Phototransistor in Software

Encoding QR Code in Software Power Supply Regulator (as Needed) Output Laser Diode Optical Fiber Phototransistor

Power Supply Regulator (as Needed) Output Laser Diode Optical Fiber Phototransistor
QR Code 2d Barcode Decoder In None
Using Barcode Control SDK for Software Control to generate, create, read, scan barcode image in Software applications.
Denso QR Bar Code Encoder In None
Using Barcode maker for Software Control to generate, create QR Code image in Software applications.
FIGURE 30-27 The basic parts of a laser-optic whisker are a laser, a length of fiber optics, and a photodetector.
QR Code Scanner In None
Using Barcode scanner for Software Control to read, scan read, scan image in Software applications.
Paint QR-Code In Visual C#
Using Barcode drawer for Visual Studio .NET Control to generate, create Denso QR Bar Code image in .NET framework applications.
OBJECT DETECTION
Denso QR Bar Code Maker In .NET
Using Barcode generator for ASP.NET Control to generate, create Quick Response Code image in ASP.NET applications.
QR Code 2d Barcode Creation In .NET
Using Barcode generator for .NET Control to generate, create QR Code 2d barcode image in .NET framework applications.
The key benefit of the laser-optic whisker system is that a collision can be detected with just a feather touch. In fact, your robot may know when it s bumped into you before you do! Since contact with the robot is through a tiny piece of plastic, there s little chance the machine will damage or hurt anything it bumps into. The whiskers can protrude several inches from the body of the robot and omnidirectionally, if you desire. In this way it will sense contact from any direction. Fig. 30-28 shows a prototype of this technique that consists of a hacked visible light penlight laser, several strands of cheap (very cheap) stepped-index optical fibers, and a set of three phototransistors. The optical fibers are tied together in a bundle using a small brass collar, electrical tape, and tie-wrap. This bundle is then inserted into the opening of the penlight laser and held in place with a sticky-back tie-wrap connector (available at Radio Shack and many other places). On the opposite ends of the optical fibers are #18 crimp-type bullet connectors. These are designed to splice two #18 or #20 wires together, end to end. Carefully crimp them onto the ends of the fibers, so they act as plug-in connectors. As shown in Fig. 30-29, these ersatz connectors plug into makeshift optical jacks, which are nothing more than 1 4-indiameter by 3 8-in-aluminum tubing. The tubing is glued over the ends of the phototransistors and the phototransistors are soldered near the edge of the prototyping PCB. Refer to Fig. 30-30 for a schematic wiring diagram of a power regulator for the penlight laser. Note the zener diode voltage regulator. The laser I used was powered by two AAA batteries, or roughly 3 V. Diode lasers are sensitive to high input voltage, and many will burn
QR-Code Printer In Visual Basic .NET
Using Barcode maker for VS .NET Control to generate, create Quick Response Code image in VS .NET applications.
Data Matrix ECC200 Printer In None
Using Barcode creation for Software Control to generate, create Data Matrix image in Software applications.
FIGURE 30-28 The prototype laser-optic sensor, showing the loose fibers (on the robot these fibers are neatly looped to create a kind of sensor antenna).
GS1 - 12 Creator In None
Using Barcode encoder for Software Control to generate, create UPC Symbol image in Software applications.
Print Barcode In None
Using Barcode drawer for Software Control to generate, create barcode image in Software applications.
30.4 SOFT TOUCH AND COMPLIANT COLLISION DETECTION
Painting EAN / UCC - 14 In None
Using Barcode drawer for Software Control to generate, create EAN 128 image in Software applications.
Draw Code39 In None
Using Barcode printer for Software Control to generate, create Code 39 Full ASCII image in Software applications.
Aluminum Tubing Fiber-Optic strand Phototransistor Bullet Connector
Create UCC - 14 In None
Using Barcode encoder for Software Control to generate, create UPC Case Code image in Software applications.
Print Bar Code In .NET
Using Barcode maker for ASP.NET Control to generate, create barcode image in ASP.NET applications.
FIGURE 30-29 Use short lengths of aluminum tubing, available at hobby stores, and a crimp-on bullet connector to create optical jacks for the laser-optic whisker system.
1D Barcode Encoder In C#.NET
Using Barcode maker for .NET framework Control to generate, create 1D image in .NET framework applications.
Reading ECC200 In None
Using Barcode decoder for Software Control to read, scan read, scan image in Software applications.
out if fed a higher voltage than they are designed for. The penlight laser consumes less than about 30 mA. An alternative is to use three signal diodes (e.g., 1N4148) in series between the +V and the input of the laser to drop the 5 vdc voltage to about 2.7 to 3.0 V. The diodes you use should be rated for 1 4-W or higher. Interfacing the Photodetectors The output of a phototransistor is close to the full 0 to 5 V range of the circuit s supply range. You ll want your robot to be able to determine the intensity changes as the whiskers bump against objects. If you re using a computer or microcontroller to operate your robot, this means you ll need to convert the analog signal produced by the detectors into a digital signal suitable for the brains on your bot. Most popular microcontroller families have analog-to-digital converter (ADC) ports built in. If your computer or controller doesn t have ADC inputs, you can add an outboard ADC using an ADC0809 or similar chips. See 14 for more information on interfacing an analog signal to a digital input by way of an analog-to-digital converter.
European Article Number 13 Drawer In Java
Using Barcode encoder for Java Control to generate, create EAN 13 image in Java applications.
Painting Barcode In VS .NET
Using Barcode creation for Reporting Service Control to generate, create bar code image in Reporting Service applications.
R1=47 ohms (typical; drives 30 mA) R1=27 ohms (drives 60 mA) Use 1/4-watt Resistors and Zener Diodes
Generating USS Code 39 In Java
Using Barcode generator for Android Control to generate, create Code 3/9 image in Android applications.
Generate Bar Code In VB.NET
Using Barcode generation for .NET Control to generate, create barcode image in VS .NET applications.
FIGURE 30-30 Most penlight lasers are designed to operate with 3 vdc; use a zener diode or voltage regulator to provide the proper voltage.
OBJECT DETECTION
Creating the Whisker Loops Okay, so the laser-optic whisker system may not use cat-type whiskers with ends that stick out. Still, the word whisker aptly describes the way the system works. If something even so much as brushes lightly against the whisker, the light reaching the photodetector will change, and your robot can react accordingly. The prototype system for this book used three whiskers, all of which were formed into three small loops around the front and two sides of the test robot. The loops can be held in place with small screws, dabs of glue (don t use hot-melt glue!), or even LEGO parts should your robot be constructed with them. When forming the loops don t make them too tight. The more compliant the loops are, the more they will detect small amounts of pressure. If the loops are very tight, the fibers become rigid and not very compliant. This reduces the effectiveness of the whiskers. At the same time, the loops should not be so loose that they tend to wobble or flap while the robot is in motion. Should this occur, the natural vibration and movement of the fiber will cause false readings. A loop diameter of from 4 to 6 in should be sufficient given optical fiber pieces of average diameter and stiffness. Experiment with the optical fibers you obtain for the project. Your laser-optic whisker system does not need to use three separate fiber strands. One strand may be enough, especially if the robot is small. The prototype used three so the robot could independently determine in which direction (left, front, right) a collision or bump had occurred. Getting the Right Kind of Optical Fiber Perhaps the hardest part of constructing this project is finding the right kind of optical fiber. You want to avoid any kind of graded-index fiber (described earlier) because these will not produce the internal interference patterns that the project depends on. In essence, what you want is the cheapest, lousiest fiber-optic strands you can find. The kind designed for light fountain art (popular in the early 1970s) is ideal. You do not want to use data communications-grade optical fiber. Before you buy miles of optical fiber, test a 2-ft strand with a suitable diode laser and phototransistor. Loop the fiber and tape it snugly to your desk or workbench. Connect the phototransistor to a sensitive volt-ohm meter or, better yet, an oscilloscope. Gently touch the fiber loops to deform them. You should observe a definite change of output in the phototransistor. If you do not, examine your setup to rule out a wiring error, and try again. Turn the laser off momentarily and observe the change in output. Working with Laser Diodes Penlight lasers can be easily hacked for a wide variety of interesting robot projects the soft-touch fiber-optic whisker is just one of them. Penlight lasers use a semiconductor lasing element. While these elements are fairly hearty, they do require certain handling precautions. And even though they are small, they still emit laser light that can be potentially dangerous to your eyes. So keep the following points in mind:
Always make sure the terminals of a laser diode are connected properly to the drive circuit. Never apply more than the rated voltage to the laser or it will burn up.
Copyright © OnBarcode.com . All rights reserved.