Contactless Digital Tachometer using PIC Microcontroller

Hey friends, I should have posted this project last month itself but there was some problem with the circuit. [link], author of this project did an exellent job. I have been watching him learning on this website. He came as a total noob but now he is well versed with 8051 and PIC microcontroller. earlier he has submitted Microcontroller Based Home Security System



This project is about A Contactless Digital Tachometer. As per defination from wikipedia

A tachometer (revolution-counter, Tach, rev-counter, RPM gauge) is an instrument measuring the rotation speed of a shaft or disk, as in a motor or other machine. The device usually displays the revolutions per minute (RPM) on a calibrated analogue dial, but digital displays are increasingly common. The word comes from Greek Ταχος, tachos, "speed", and metron, "to measure".

wikipedia



Following diagram explains the logic of this project.



The infra red reflective object sensor work by simply emitting the infra red beam and when it encounter the white object surface than the infra red beam will be reflected back to the phototransistor; next the phototransistor and the 2N3904 transistor which formed the Darlington pair will start to conduct and will generate enough voltage across the 470 Ohm resistor to be considered by the PIC16f690 microcontroller build in Capture Compare Pulse width modulation(CCP )module input port as the logical "1". When the infra red beam encounters the black tire surface than both of the phototransistor and 2N3904 transistor will turn off; and the voltage across 470 Ohm resistor will drop to 3.5 volt (logical "0").

Therefore by timing the generated pulse period by the infra red reflective object sensor we could easily calculate the RPM using this following formula:

Frequency = 1/T Hz; T is the generated pulse period in second.

RPM (Rotation per Minute) = Frequency x 60

Here is a sample video of working project:



You can download project related files here:

Download Contactless Digital Tachometer project

Thank you Romel for this contribution. If anyone has doubts regarding this project, please use forum.
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DavesGarage
Tue Jan 09 2018, 07:55 PM
It's been a few years since I poked around here - Hi all...
ExperimenterUK
Mon Jan 08 2018, 07:19 PM
Hi TPS. it's been a while..
۞ TPS ۞
Sun Jan 07 2018, 06:42 PM
hello
Thu Jan 04 2018, 01:50 PM
sayyad affrid
its AT89S52
Thu Jan 04 2018, 01:50 PM
sayyad affrid
sir, i want embedded c code for ultrasonic sensor having buzzer interfaced with AT9S52
Mon Dec 18 2017, 08:12 PM
zafir
i am making digital voltmeter using AT89C51, ADC and LCD 16x2,,, kindly someone please send me hex file in assembly language
Fri Dec 15 2017, 12:18 PM
mehari
can not find dhtxx.md file in proteus 8.0 can anybody help me please?
sahar7478
Fri Dec 08 2017, 12:47 PM
can i get gsm a6 library? can anybody help? tia
Faiqa
Sat Nov 25 2017, 08:32 AM
Can i get the code of Monitering and controlling of green house effect? ... Can anyone help me ?
Wed Nov 08 2017, 01:35 PM
Anirudh jain
I want to burn code in atmel 89s51 24pc 0329 but cannot get the connection with the burner. Can somebody provide me with the circuit diagram for connecting controller to burner. I'm using usb burner

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vieslav
Thu Jan 18 2018, 06:19 PM
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ExperimenterUK Avatar
Posted By ExperimenterUK
Sat Jan 13 2018, 10:26 PM
This is clearly an old design.A modern microcontr...
bastik Avatar
Posted By bastik
Sat Jan 13 2018, 09:38 PM
For now I don’t have much information about device...
ExperimenterUK Avatar
Posted By ExperimenterUK
Fri Jan 12 2018, 06:49 PM
Sometimes the Configuration word has to be program...
ExperimenterUK Avatar
Posted By ExperimenterUK
Fri Jan 12 2018, 06:30 PM
What exactly is your situation ?I very much doubt ...
eddieprice Avatar
Posted By eddieprice
Fri Jan 12 2018, 04:32 PM
I am using a 16F84A for the first time and am havi...
bastik Avatar
Posted By bastik
Fri Jan 12 2018, 10:37 AM
I have device with SAB80C535 microcontroller and I...
ExperimenterUK Avatar
Posted By ExperimenterUK
Fri Jan 12 2018, 12:01 AM
I tried to compile your 8051 version in Keil 5but...
cjj20 Avatar
Posted By cjj20
Tue Jan 09 2018, 07:42 PM
I just think something is off in the checkgpgga fu...
ExperimenterUK Avatar
Posted By ExperimenterUK
Tue Jan 09 2018, 07:35 PM
Why do you think there is something wrong with it...
cjj20 Avatar
Posted By cjj20
Tue Jan 09 2018, 07:32 PM
Please help me correct this code #include ...