use barcode reader in asp.net int ReadPot() Potentiometer s Position { int i; // Return the in Software

Drawing QR Code JIS X 0510 in Software int ReadPot() Potentiometer s Position { int i; // Return the

int ReadPot() Potentiometer s Position { int i; // Return the
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C = 0.1 uF 100 Ohms R = 10 K PIC Micro I/O Pin
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Figure 17.20 A circuit that can measure the resistance of a potentiometer by the time it takes for a capacitor to discharge through it.
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ANALOG I/O
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pin = output; pin = 1; for (i = 0; i < charge; i++); pin = input; for ( i = 0; pin == 1; i++); return I ; } // End ReadPot
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Charge the Capacitor Let the Capacitor Discharge
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The PIC microcontroller assembly-language code for implementing this potentiometer read is not much more complex than this pseudocode. Later in this book I will give you some examples of how potentiometer reads are actually accomplished. The 100- resistor between the PIC microcontroller pin and the RC network is used to prevent any short circuits to ground if the potentiometer is set so that there is no resistance in the circuit at all. This method of reading a potentiometer s position is very reliable, but it is not very accurate, nor is it particularly fast. When setting this up for the rst time in a speci c circuit, you will have to experiment to nd the actual range it will display. This is due to part variances (including the PIC microcontroller) and the power-supply characteristics. For these reasons, I do not recommend using the potentiometer/ capacitor circuit in any products. Tuning the values returned will be much more expensive than the cost of a PIC microcontroller with a built-in ADC.
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The PIC microcontroller, like most other digital devices, does not handle analog voltages very well. This is especially true for situations where high-current voltages are involved. The best way to handle analog voltages is to use a string of varying-wide pulses to indicate the actual voltage level. This string of pulses is known as a PWM analog signal and can be used to pass analog data from a digital device, control dc devices, or even output an analog voltage. In this section I want to discuss PWM signals and how they can be used with the PIC microcontroller. In the discussion of TMR1 and TMR2 earlier in this book, I presented how PWM signals were implemented and read using the CCP built-in hardware of the PIC microcontroller. For this section I will show how PWM signals can be used for I/O in PIC microcontrollers that do not have the CCP module built in. A PWM signal is a repeating signal that is on for a set period of time that is proportional to the voltage that is being output. A PWM signal is shown in Fig. 17.21. I call the on time the pulse width in the gure, and the duty cycle is the percentage of the on time relative to the PWM signal s period. To output a PWM signal, the following code could be implemented, although there is no way of changing the values while it is running (unless you were to include an interrupt handler):
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Period = PWMPeriod; On = PWMOn; // // Initialize the Output Parameters
PIC MCU INPUT AND OUTPUT DEVICE INTERFACING
Pulse Width Period Duty Cycle = 100% * Pulse Width Period
Figure 17.21 The basic PWM waveform with its features labeled.
while (1 == 1) { PWM = ON; for (i = 0; i < On; i++ ); PWM = off; For ( ; i < PWMPeriod; i++ ) } // end while // Start the Pulse // Output ON for On Period of // Time // Turn off the Pulse ; // Output off for the rest of the // PWM Period
To avoid the problem of all the resources being devoted to the PWM code, I would recommend using the TMR0 interrupt to create the PWM timing:
Interrupt PWMOutput() { // When Timer Over ows, Toggle On and Off // and Reset Timer to correct delay for Value
if (PWM == ON) { // If PWM is ON, Turn it off and Set Timer PWM = off; // Value TMR0 = PWMPeriod - PWMOn; } else { // If PWM is off, Turn it ON and Set Timer PWM = ON; // Value TMR0 = PWMOn; } // INTCON.T0IF = 0; } // // Reset Interrupts
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