vb.net read barcode from camera EXPERIMENTING WITH TILT AND GRAVITY SENSORS in Software

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EXPERIMENTING WITH TILT AND GRAVITY SENSORS
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The do/loop continually reads the outputs of the sensor. Without the Pause statement and Debug lines, the code loops very fast just a few tenths of microseconds which allows you to insert other programming for your robot. Note that once the loop has begun, the value of T2 is never read again (unless you restart the entire program). This is acceptable for low-accuracy applications like basic tilt sensing. But when higher accuracy is required, the timing of the T2 pulse train should be re-read every 5 or 10 minutes, and even more frequently if the robot will be subjected to sudden and sharp temperature changes. The output of the ADXL202 is sensitive to temperature, so changes in temperature will affect the timing of the T2 pulse. As the program runs you will note that the value of the x and y outputs will change 50 to 75 just by tilting the accelerometer on its sides. Sudden movement of the accelerometer will produce more drastic changes. Note the values you get and incorporate them into the accelerometer control software you devise for your robot.
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35.3.5 ADDITIONAL USES
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Though the ADXL202 accelerometer is ideally suited for use as a tilt sensor, it has other uses, too. No additional hardware or even software is required to turn the sensor into a movement, vibration, and shock sensor. Assuming that the accelerometer is oriented so the robot travels in the chip s x axis, then as the robot moves the ADXL202 will register the change in acceleration. Should the robot hit a wall or other obstacle, it will be sensed as a very high acceleration/ deceleration spike. Your control software will need to loop through the code at a high enough rate to catch these momentary changes in output if you want your robot to react to shocks and vibrations. The do/loop in the previous code repeats often enough that your robot should detect most collisions with objects. If you absolutely must detect all collisions you ll need to devise some kind of hardware interrupt that will trigger the microprocessor or microcontroller when the output of the ADXL202 exceeds a certain threshold. Another approach is to dedicate a fast-acting microcontroller just to the task of monitoring the output of the ADXL202. The low cost of microcontrollers these days makes such dedicated applications a reasonable alternative.
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35.4 Alternatives to Store-Bought Accelerometers
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While factory-made accelerometers, such as the Analog Devices ADXL150 and ADXL202, are the most convenient for use with robotics, there are some low-cost alternatives you might want to experiment with. You can make your own home-brew accelerometer using a 50-cent piezo ceramic disc and a heavy steel ball or other weight. The home-brew piezo accelerometer isn t as accurate as the ADXL series or other factory-made accelerometers, but it ll do in a pinch and teach you about the physics of motion in the process. The piezo disc accelerometer works by using a well-known behavior of piezoelectric material: it is both a consumer of energy and a producer of energy. Most applications of
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piezoelectric materials are in consumer products like speakers and beepers. Apply a voltage to the piezoelectric material, and it vibrates, producing a tone. Conversely, if you vibrate the piezoelectric material using some mechanical means, the output is an electrical signal. Piezo discs are common finds in electronic and surplus stores. These units are typically used as the elements in low-cost speakers or tone-makers (like smoke alarms, car alarms, etc.). The typical piezo disc is about an inch in diameter and is made of brass or some other nonferrous metal. Deposited on one side of the disc is a ceramic material made of piezo crystals. These crystals vibrate when a voltage is applied to the disc. Most piezo discs already have two wire leads conveniently soldered to them so they can be easily connected to the rest of your circuit.
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