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1. #PIC SIGNAL MEASUREMENT TIMER PBP3 HOW TO#
2. #PIC SIGNAL MEASUREMENT TIMER PBP3 GENERATOR#
3. #PIC SIGNAL MEASUREMENT TIMER PBP3 UPGRADE#
4. #PIC SIGNAL MEASUREMENT TIMER PBP3 CODE#

#PIC SIGNAL MEASUREMENT TIMER PBP3 CODE#

#PIC SIGNAL MEASUREMENT TIMER PBP3 UPGRADE#

This project is an upgrade to DC motor PWM, where the PWM duty cycle is adjusted using a potentiometer, but rotation speed is heavily depending on the motor mechanical load. Comments are made in code for your understanding.The PIC16F18875 features Signal Measurement Timer. So this is code for pulse width measurement using pic microcontroller. T2 = t2 + (TMR1H<<8)|(TMR1L) // Store values for 2nd capture TRISC.B1 = 1 // CCP1 pin - RC5 set to input TRISC.B2 = 1 // CCP1 pin - RC5 set to input

#PIC SIGNAL MEASUREMENT TIMER PBP3 GENERATOR#

I am using proteus pulse generator ang given it as a input to ccp module of pic17f877a microcontroller.Ĭode pulse width measurement using pic microcontroller sbit LCD_RS at RB1_bit ĬCP1CON = 0x05 // Capture rising edge (101)ĬCP2CON = 0x04 // Switch edge to falling I am using proteus for simulation purpose. LCD is connected with PORTB of microcontroller. 1 6×2 LCD is interfaced with pic microcontroller. LCD is used to display value of pulse width measurement in terms of time.

#PIC SIGNAL MEASUREMENT TIMER PBP3 HOW TO#

How to use capture compare PWM module Circuit diagram of pulse width measurement using pic microcontrollerĪs I have already mentioned, I have used pic16F877A microcontroller in this article.How to use timers of pic microcontroller.So to understand this tutorial you should know how to use timers of pic microcontroller and how to use capture compare module of pic microcontoller: Timer measure by timer will be the width of our PWM.

So whenever capture pin of pic microcontroller captures a positive edge,we will turn on the timer and as soon as it detect the negative edge, we will turn off the timer.

So the idea here is that we will use a built in timer of pic16f877a microcontroller and capture compare mode of pic microcontroller is used to detect a positive edge and a negative edge of pulse. So if we can measure a time between a positive edge detection and next negative edge detection, we can easily measure pulse width with respect to time. So pulse width is basically a on time between a positive edge and a negative edge. Every pulse width must have a positive edge and a negative edge.

So I believe now you know what is pulse width. So in this tutorial our objective is to find a method to calculate the pulse width of any pwm without knowing about its time period. Figure below shows a PWM of amplitude 5 volt and timer period is 0.3 second and duty cycle is 25% which means pulse width is 25% becuase PWM is high for 25% of total time period and remains off for 75% of total time period. Duty cycle is also known as the width of PWM. PWM has two main components one is time period and other one is duty cycle. It has been used in many applications like communications, power electronics project and electrical projects. PWM is used to generate a analog signal with the help of digital signal.