vb.net barcode reader from image CONTROLLING A SERVO VIA A BASIC STAMP in Software

Draw Quick Response Code in Software CONTROLLING A SERVO VIA A BASIC STAMP

22.9.2 CONTROLLING A SERVO VIA A BASIC STAMP
Decoding QR Code 2d Barcode In None
Using Barcode Control SDK for Software Control to generate, create, read, scan barcode image in Software applications.
Quick Response Code Creation In None
Using Barcode generation for Software Control to generate, create QR Code image in Software applications.
With a little bit of thought to the software, a BASIC Stamp 2 can be used to control one or more servos as well as have enough time left over to poll inputs and determine what is the appropriate next action. Fig. 22-7 shows the hookup diagram for connecting a standard servo to the BS2. It is very important to note that the power to the servo does not come from the BS2, or any prototyping board it is on. Servos require more current than the power supply on the Stamp can provide. A pack of four AA batteries is sufficient to power
QR Decoder In None
Using Barcode decoder for Software Control to read, scan read, scan image in Software applications.
QR Code Encoder In C#
Using Barcode maker for .NET Control to generate, create QR Code JIS X 0510 image in Visual Studio .NET applications.
6V 6V
Making QR Code ISO/IEC18004 In .NET Framework
Using Barcode drawer for ASP.NET Control to generate, create QR Code 2d barcode image in ASP.NET applications.
QR Code JIS X 0510 Encoder In Visual Studio .NET
Using Barcode generator for Visual Studio .NET Control to generate, create QR-Code image in .NET framework applications.
+>-=1
Create Denso QR Bar Code In VB.NET
Using Barcode generation for .NET Control to generate, create Denso QR Bar Code image in Visual Studio .NET applications.
Bar Code Drawer In None
Using Barcode creation for Software Control to generate, create barcode image in Software applications.
R1 = 2.7M
Generating Code 128 Code Set B In None
Using Barcode printer for Software Control to generate, create Code 128C image in Software applications.
EAN / UCC - 14 Maker In None
Using Barcode encoder for Software Control to generate, create UCC - 12 image in Software applications.
+>-=1
Bar Code Creation In None
Using Barcode creator for Software Control to generate, create bar code image in Software applications.
Creating DataMatrix In None
Using Barcode creator for Software Control to generate, create Data Matrix ECC200 image in Software applications.
100k 0.01 uF 100k Pot C= 0.01 uF
ISBN - 10 Printer In None
Using Barcode creator for Software Control to generate, create ISBN - 13 image in Software applications.
Read Barcode In None
Using Barcode scanner for Software Control to read, scan read, scan image in Software applications.
12 11
Bar Code Decoder In Java
Using Barcode Control SDK for Java Control to generate, create, read, scan barcode image in Java applications.
Paint UPC Code In Java
Using Barcode generator for BIRT Control to generate, create Universal Product Code version A image in BIRT applications.
R _Q
GS1 - 12 Encoder In None
Using Barcode creation for Font Control to generate, create UPCA image in Font applications.
EAN 13 Printer In VS .NET
Using Barcode printer for .NET framework Control to generate, create European Article Number 13 image in Visual Studio .NET applications.
0.01 uF R2 = 100k C= 0.01 uF
Barcode Drawer In None
Using Barcode maker for Microsoft Word Control to generate, create barcode image in Word applications.
UPC-A Supplement 2 Creator In .NET
Using Barcode maker for .NET framework Control to generate, create UPC-A Supplement 5 image in .NET framework applications.
4 5 6 7
_Rst
Q _Q R
_Rst
10 9
+>-=1
+>-=1
6V 6V
White Servo Red Wires Black 4x AA Battery
Servo Connector
FIGURE 22-6 The left 555 oscillator circuit provides a 20 ms trigger waveform for the monostable oscillator on the right. The monostable oscillator produces a 1 to 2 ms pulse depending on the position of the potentiometer.
22.9 CIRCUITS FOR CONTROLLING A SERVO
TABLE 22-4 IC1 Pot R2, R3 R1 C1 C4 Bat Misc.
Parts Needed to Build the 556 Servo Control Circuit 556 timer chip 100k single turn potentiometer 100k resistor 2.7M resistor 0.01 F capacitors (any type) 4x AA battery clip Circuit breadboard, wiring, servo connector header
the servo. For proper operation ensure that the grounds are connected between the Stamp and the battery pack. Use a 33 to 47 F capacitor between the +V and ground of the AA pack to help kill any noise that may be induced into the electronics when the servo turns on and off. The following application sends the appropriate pulses to a servo for 1 s and then polls the user (using the DEBUG and DEBUGIN console interface statements) to enter in a value that is passed to the servo. The reason why the application is called calibrate is due to its use as a method to find the correct stop pulse length for a servo modified for continuous rotation (described in the following).
' Calibrate - Find the Center/Not Moving Point for Servo '{$STAMP BS2} '{$PBASIC 2.50}
+V for BS2 +6 vdc Any I/O Pin Servo Gnd BASIC Stamp
Ground for Connected +6 vdc Servo Grounds Power Ground for +V BS2 Power
FIGURE 22-7 Hookup diagram for connecting a servo to a BASIC Stamp 2.
WORKING WITH SERVO MOTORS
' Variables Servo CurrentDelay i '
pin 15 var word var byte
Servo Center Point
Initialization/Mainline low Servo ' Set Servo Pin Low CurrentDelay = 750 ' Start at 1.5 ms do ' Repeat forever debug "Current Servo Delay Value = ",dec CurrentDelay,cr for i = 0 to 50 ' Output servo value for 1 s pulsout Servo, CurrentDelay pause 18 ' 20 msec Cycle Time next debug "Enter in New Delay Value " debugin dec CurrentDelay do while (CurrentDelay < 500) or (CurrentDelay > 1000) debug "Invalid Value, Must be between 500 and 1000",cr debug "Enter in New Delay Value " debugin dec CurrentDelay loop loop
22.9.3 USING A DEDICATED CONTROLLER
R/C receivers are designed with a maximum of eight servos in mind. The receiver gets a digital pulse train from the transmitter, beginning with a long sync pulse, followed by as many as eight servo pulses. Each pulse is meant for a given servo attached to the receiver: pulse 1 goes to servo 1, pulse 2 goes to servo 2, and so on. The eight pulses plus the sync pulse take about 20 ms. This means the pulse train can be repeated 50 times each second, which is its refresh rate. As the refresh rate gets slower the servos aren t updated as quickly and can throb or lose position as a result. Depending on your electronics and programming ability, you may find it very difficult to simultaneously supply pulses to multiple servos at one time (a quick Google search on the Internet will find applications that control up to four servos simultaneously using a single BS2 and more using a Microchip PIC MCU). Rather than invest the time and effort developing this capability, you can buy inexpensive servo controllers from a number of sources (see Appendix B, Sources, for addresses and web sites) that can control five, eight, or even more servos autonomously, which reduces the program overhead of the microcontroller or computer you are using. The main benefit of dedicated servo controllers is that a great number of servos can be commanded simultaneously, even if your computer, microcontroller, or other circuitry is not multitasking. For example, suppose your robot requires 24 servos. Say it s an eight-legged spider, and each leg has three servos; each servo controls a different degree of freedom of the leg. One approach would be to divide the work among three servo controllers, each capable of handling eight servos. Each controller would be responsible for a given degree of freedom. One might handle the rotation of all eight legs; another might handle the flexion of the legs; and the third might be for the rotation of the bottom leg segment. Dedicated servo controllers must be used with a computer or microcontroller, as they need to be provided with real-time data in order to operate (commonly sent in a serial data format). A sequence of bytes sent from the computer or microcontroller is decoded by the
Copyright © OnBarcode.com . All rights reserved.