barcode scanner sdk vb.net Reading and CReating Pulses in Software

Generate Quick Response Code in Software Reading and CReating Pulses

Reading and CReating Pulses
QR Code Scanner In None
Using Barcode Control SDK for Software Control to generate, create, read, scan barcode image in Software applications.
Printing QR Code In None
Using Barcode generator for Software Control to generate, create QR Code JIS X 0510 image in Software applications.
The technique we will use to measure the pulse width is as follows:
Recognize QR In None
Using Barcode scanner for Software Control to read, scan read, scan image in Software applications.
Making QR Code JIS X 0510 In C#.NET
Using Barcode encoder for VS .NET Control to generate, create Quick Response Code image in VS .NET applications.
We use the system counter as our timer. We wait for the signal to go low. We then wait for it to go high and then low again to skip a cycle. When the signal next goes high, we read the counter immediately. We wait for the signal to go low. When the signal goes low, we read the counter again immediately. We wait for the signal to go high. When the signal goes high, we read the counter again immediately. We calculate the differences between the counts to get the values we need. Each unit is 1/10,000,000 seconds.
Encoding Denso QR Bar Code In VS .NET
Using Barcode creator for ASP.NET Control to generate, create QR image in ASP.NET applications.
QR-Code Creation In .NET Framework
Using Barcode creator for .NET framework Control to generate, create QR image in .NET applications.
The first two high/lows are ignored to make sure we start at a valid edge. (Often sensing one falling edge can be enough to find the next rising edge.) In other words, determining a pulse width is a matter of starting to read the system clock when a signal goes high and adding clock counts to a counter until the signal goes low. If the signal frequency is high and the pulses are short, the time needed to read the data can be quite short. We need to design our program so that we can count a few hundred cycles during the duration of the pulse. A number in the hundreds will allow us to detect a small change in the cycles counted with ease. If we want to have a resolution of 0.5%, we need to read long enough to read over 200 cycles at the point of interest. If we are looking at a range, even the lowest part of the range needs to read 200 cycles. This means that, in general, high frequencies are easier to read and work with than lower frequencies. As shown in Figure 18-1, the Memsic 2125 provided by Parallax is an eight-pin device. Of these eight pins, two pins are not connected to anything and we will ignore a third (the temperature output). The other five connections are shown in Figure 18-1.
QR Code JIS X 0510 Drawer In VB.NET
Using Barcode drawer for VS .NET Control to generate, create Denso QR Bar Code image in .NET applications.
Bar Code Printer In None
Using Barcode generation for Software Control to generate, create bar code image in Software applications.
Figure 18-1 Memsic 2125 gravity sensor connections
Code 128 Generator In None
Using Barcode drawer for Software Control to generate, create USS Code 128 image in Software applications.
Painting Barcode In None
Using Barcode generator for Software Control to generate, create barcode image in Software applications.
deteRmining the Pulse Width
Encode EAN128 In None
Using Barcode printer for Software Control to generate, create UCC-128 image in Software applications.
UPCA Drawer In None
Using Barcode generator for Software Control to generate, create UCC - 12 image in Software applications.
Figure 18-2 Memsic 2125 perf board and LCD display. (The frequency being read is 100 Hz.)
Draw Bookland EAN In None
Using Barcode encoder for Software Control to generate, create ISBN image in Software applications.
Barcode Drawer In None
Using Barcode printer for Online Control to generate, create barcode image in Online applications.
The sensor can be purchased for $25 to $30 (2010) in single quantities. It is mounted on a mini board with pins 0.1 inches on center. We need to mount the device on a board that we can tilt in two directions to see what happens to the signals we are getting. See Figure 18-2 for my breadboard with the sensor mounted on it. See Figure 18-3 for the wiring diagram. We are going to use the repeat and while instructions to determine the pulse length in Program 18-1. Refer to the Propeller Manual for a detailed description of these instructions.
Recognize EAN13 In Java
Using Barcode scanner for Java Control to read, scan read, scan image in Java applications.
UPC-A Supplement 2 Creation In Java
Using Barcode printer for Java Control to generate, create GS1 - 12 image in Java applications.
Figure 18-3 Wiring the Memsic 2125 to a Propeller chip and an LCD
Code 128 Code Set C Creator In VS .NET
Using Barcode creation for ASP.NET Control to generate, create Code128 image in ASP.NET applications.
Reading Code 39 In VB.NET
Using Barcode decoder for Visual Studio .NET Control to read, scan read, scan image in VS .NET applications.
Reading and CReating Pulses
UPC-A Supplement 5 Printer In .NET Framework
Using Barcode encoder for ASP.NET Control to generate, create UPCA image in ASP.NET applications.
Universal Product Code Version A Creation In .NET Framework
Using Barcode generation for VS .NET Control to generate, create UPC Code image in .NET applications.
Program 18-1 Reading One Axis of the Memsic Gravity Sensor: Generating Output to Match at 5 the Read Frequency
{{13 Sep 09 Harprit Sandhu MemsicWidth.spin Propeller Tool Ver 1.2.6 18 Program 1 This program measures the pulse width and cycle time output from a Memsic 2125 gravity sensor as it is tilted from the horizontal plane to the vertical plane. COG_LCD manages the LCD output COG_0 measures the pulse }} CON _CLKMODE=XTAL1+ PLL2X _XINFREQ = 5_000_000 xaxis = 25 output = 26 VAR long Stack[55] long Stack1[55] long startWave long endPulse long endWave long PulseLen long waveLen long frequency OBJ LCD : "LCDRoutines4" UTIL : "Utilities"
'The system clock spec 'crystal frequency '
'FOR LCD COG 'FOR OUTPUT COG ' ' ' ' ' ' 'These are the Objects we will need 'for controlling the LCD 'for general methods collection
PUB go 'Cog_0 cognew (COG_LCD, @Stack) 'starting up Cog LCD cognew (COG_OUT, @Stack1) 'starting up Cog OUT DIRA[25]~ 'Make pin input repeat 'Set up the control loop repeat while ina[xaxis]==1 'wait for line 1 to go low. repeat while ina[xaxis]==0 'wait for line 1 to go low. 'the above 2 lines make sure that we see 'a full wave when we start measuring repeat while ina[xaxis]==1 'wait for line 1 to go low. startWave:=CNT 'read the timer count (continued)
Copyright © OnBarcode.com . All rights reserved.