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This is essentially how we read a switch into the Propeller chip when we need to. If we were looking at extremely fast phenomena, we would have to take measures to de-bounce the switch in either hardware or software to make sure we did not misinterpret its operation. We will not worry about that at this time, but you should be aware of the fact that switch bounce is a problem with mechanical switches. Mechanical switches are hundreds, even thousands of times slower than even slow microcontrollers. We defined all the constants at the top of the program. Defining constants allows you to make changes to the I/O line identifications and such with ease. When we do it in this way, any changes we make will be reflected throughout the program automatically. We define a high as 0 and a low as 1 in this program because we are using one of the inverting hex buffers in the 7404. These buffers turn a 0 into a 1 and a 1 into a 0, so we take care of this inversion in the software definitions. Note that this does not affect the input at the input pin because we are reading that directly (there is no intermediate buffer). As a rule, we can connect to high impedance inputs directly, unless we are dealing with high voltage, in which case special safety precautions must be undertaken.
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Binary input and Output
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If you remove the pull-up register on the input line, you will notice that even putting an oscilloscope on the line will pull it down. As discussed previously, all input lines must be tied high or low if you want to prevent unexpected behavior.
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The Repeat Command
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When no number appears after the repeat command, the indented lines under the repeat command are repeated endlessly. If there is a number, it defines how many times the lines are to be repeated. Note that we are using methods to perform simple tasks such as turning the LED on and off. Although not strictly necessary in this case, we are using methods to do even simple tasks now because in the long run this is the best way of doing it. We say it is good practice. It allows things that we do often to be made easy, and the methods themselves are easy to edit. The changes you make to a method will be reflected throughout all the objects you develop, automatically, if you use these programming techniques.
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Reading a PotentiometeR: CReating an inPut We Can VaRy in Real time
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Along with binary on/off switches, which provide a two-state input, we need to be able to enter information that we can vary with a rotating knob, so that we can see the effect of varying the inputs on our experiments. This is usually done with a potentiometer placed across a voltage. This being the case, we need to learn how to interact with such a voltage next. In this chapter we will learn how to read a potentiometer first into one byte (and later on with a resolution of 12 bits). One byte gives us a value between 0 and 255 for the full range of the potentiometer rotation. We can use this to control a variable with a resolution of approximately 0.39% (one part in 256). It is also possible to read a potentiometer into more than one byte; 12-bit analog-to-digital (A-to-D) converters provide an easy way to get much higher resolutions, and we will consider their use at the end of the chapter. Twelve bits provide a resolution of one part in 4,096, or 0.0244%.
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note We will set up most of our experiments with the ability to use two variable inputs,
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meaning that we will need the ability to read two potentiometers into our experiments. This will allow us to vary two variables in real time when we need to without having to change the experimental setup. We will not discuss a two-potentiometer setup in this chapter, but our experimental setups will have the ability to use two variable inputs. Reading the second potentiometer is similar to reading the first one.
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One way to measure the resistance of a potentiometer without an A-to-D converter is to charge a capacitor to a known voltage and then discharge it through a resistor until it gets down to a known, specific voltage. The time it takes for the capacitor to discharge will be a function of the resistance of the potentiometer. The relationship is not strictly linear, but it is good enough for our immediate purposes.
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