birt barcode open source Figure 8-1. 4.3V supply voltage versus current in Font

Draw QR Code 2d barcode in Font Figure 8-1. 4.3V supply voltage versus current

Figure 8-1. 4.3V supply voltage versus current
Drawing QR In None
Using Barcode creation for Font Control to generate, create QR Code 2d barcode image in Font applications.
www.OnBarcode.com
Encode Barcode In None
Using Barcode generator for Font Control to generate, create Barcode image in Font applications.
www.OnBarcode.com
Hall Effect Sensor
PDF-417 2d Barcode Generation In None
Using Barcode drawer for Font Control to generate, create PDF-417 2d barcode image in Font applications.
www.OnBarcode.com
ANSI/AIM Code 128 Creation In None
Using Barcode generator for Font Control to generate, create Code 128C image in Font applications.
www.OnBarcode.com
The Hall Effect Sensor describes a magnetic field phenomenon in semiconducting materials. Without getting overly technical, electrons moving in a semiconductor are deflected by a magnetic field. The amount of deflection depends on the strength and orientation of the field. The deflection becomes
ANSI/AIM Code 39 Creator In None
Using Barcode maker for Font Control to generate, create USS Code 39 image in Font applications.
www.OnBarcode.com
EAN-13 Supplement 5 Maker In None
Using Barcode creator for Font Control to generate, create UPC - 13 image in Font applications.
www.OnBarcode.com
CHAPTER 8 4.3V POWERED SENSORS
Painting Data Matrix In None
Using Barcode encoder for Font Control to generate, create Data Matrix image in Font applications.
www.OnBarcode.com
Make Code 11 In None
Using Barcode creation for Font Control to generate, create USD8 image in Font applications.
www.OnBarcode.com
a voltage that can be processed and converted into a switch-like output. Panasonic makes the DN6849 switch-type Hall Effect Sensor (Digi-Key #DN6849SE-ND). The DN6848 is a similar but discontinued part. Figure 8-2 shows the internal block diagram of the DN6849SE. The voltage generated by the Hall element is very small and requires an amplifier. Following the amplifier is a block of circuitry called a Schmitt Trigger, which determines whether the level is above a threshold and turns the switch on. It also prevents the output from rapidly toggling on and off when the level is equal to the threshold. Finally, the output is a transistor that s well-matched to the NXT sensor input.
Painting Quick Response Code In Java
Using Barcode generation for Java Control to generate, create QR Code image in Java applications.
www.OnBarcode.com
QR-Code Reader In Visual C#
Using Barcode recognizer for .NET Control to read, scan read, scan image in Visual Studio .NET applications.
www.OnBarcode.com
Figure 8-2. DN6849SE Hall Effect Sensor block diagram
Barcode Creator In None
Using Barcode creation for Word Control to generate, create Barcode image in Office Word applications.
www.OnBarcode.com
Making USS Code 128 In None
Using Barcode generator for Microsoft Word Control to generate, create Code 128 Code Set A image in Word applications.
www.OnBarcode.com
Hall Sensor Construction
Encoding Code 39 In Objective-C
Using Barcode generator for iPad Control to generate, create Code 39 image in iPad applications.
www.OnBarcode.com
UPC Symbol Recognizer In Java
Using Barcode scanner for Java Control to read, scan read, scan image in Java applications.
www.OnBarcode.com
The DN6849SE is so simple it can be connected directly to the end of a cut NXT cable, and it s so small it can be used without extensive packaging. The outline and pin out of the device is shown in Figure 8-3.
EAN 13 Encoder In Objective-C
Using Barcode generation for iPad Control to generate, create EAN 13 image in iPad applications.
www.OnBarcode.com
Painting UCC-128 In .NET Framework
Using Barcode creation for ASP.NET Control to generate, create GTIN - 128 image in ASP.NET applications.
www.OnBarcode.com
Figure 8-3. DN6849SE pin out The green wire in the NXT cable connects to the left, the black to the center, and the white to the right leg of the part. Figures 8-4 and 8-5 show the construction steps. Use heat shrink tubing to protect and insulate the connections.
Decoding Code 128 In VB.NET
Using Barcode reader for Visual Studio .NET Control to read, scan read, scan image in Visual Studio .NET applications.
www.OnBarcode.com
Encode PDF 417 In Visual Studio .NET
Using Barcode creation for VS .NET Control to generate, create PDF-417 2d barcode image in VS .NET applications.
www.OnBarcode.com
CHAPTER 8 4.3V POWERED SENSORS
Draw UCC-128 In None
Using Barcode encoder for Online Control to generate, create EAN / UCC - 14 image in Online applications.
www.OnBarcode.com
Barcode Creator In C#.NET
Using Barcode creator for Visual Studio .NET Control to generate, create Barcode image in VS .NET applications.
www.OnBarcode.com
Figure 8-4. Hall Sensor construction step 1
Figure 8-5. Hall Sensor construction step 2
CHAPTER 8 4.3V POWERED SENSORS
Robot Mouse
Scientific research has proven that mice actually don t like cheese! However, the myth that mice love the smelly stuff will probably never die. This robot mouse has a Hall Effect Sensor for a nose and thinks a magnet is its cheese. The NXT Quick Start Vehicle is an excellent starting point for the robot mouse. All you need to add is a little boom to hold the Hall Sensor out in front, as shown in Figure 8-6. The height is adjusted so that the sensor just passes over the magnet without touching it. In this case, the magnet is a LEGO train car coupler, but it could be any small permanent magnet.
Figure 8-6. NXT robot mouse with Hall Effect nose The NXT-G mouse program shown in Figure 8-7 has two parallel branches. The top branch simply keeps sweeping the robot back and forth with a slow forward motion. The bottom branch waits for the Hall Sensor to smell something; it then brakes the motors and stops the program. You might add some sniffing sounds and maybe a final yummy sound at the end.
CHAPTER 8 4.3V POWERED SENSORS
Figure 8-7. NXT-G robot mouse program
Transistor Buffer
Not every sensor you want to hook up to the NXT can connect as easily as the DN6849SE. Either the 10k resistor inside the NXT is too much load or the 5V supply causes trouble. A transistor buffer, shown in Figure 8-8, is the perfect solution to the problem. The transistor does the dirty work of driving the NXT input and isolating the 5V supply from the sensor. This design is not foolproof; if you plug it into a motor port it will most likely be damaged. (In the section Enhancing the Transistor Buffer we ll suggest an enhancement that fixes that problem.)
Figure 8-8. Transistor buffer with NXT sensor input circuitry The transistor in the circuit is a PNP type, and the symbol for it is shown in Figure 8-9 along with its pin out. The transistor doesn t need much gain, faces only low voltages, and handles practically no current. Probably the most common small-signal PNP transistor such as this in a leaded package is the 2N3906. Radio Shack sells these transistors in packages of 15.
Copyright © OnBarcode.com . All rights reserved.