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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hareeshchamiyar
Thu Mar 29 2018, 10:47 AM
please help me for the configuration bits for dspic30f2010
hareeshchamiyar
Thu Mar 29 2018, 10:45 AM
can any one using dspic30f2010.
Thu Mar 29 2018, 06:03 AM
Neena
can anybody give solar tracking in 8051 using proteus and keil to mail [email protected]
ExperimenterUK
Mon Mar 19 2018, 07:33 PM
sorry bedo.. maybe next time
Sun Mar 18 2018, 07:48 AM
Mourya Manojkumar
Please send me circuit diagram and PCB diagram
Thu Mar 01 2018, 05:49 AM
Felixc
May you please help me with a code for programmable load shedding controlling 4 loads
Sun Feb 25 2018, 08:29 PM
ezeoke.charles
i need of it
Sat Feb 24 2018, 03:35 AM
Aaquib
I want help for digital ic tester
ExperimenterUK
Tue Feb 20 2018, 04:01 PM
Join up.. and post your problem
Mon Feb 19 2018, 11:17 AM
ashishkumar
i needs help for my project

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jamiel
Sat Apr 14 2018, 12:47 AM
akrepkral76
Wed Apr 04 2018, 07:51 PM
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rana2056
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Mon Mar 26 2018, 07:17 AM
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Sat Mar 24 2018, 12:31 PM
LAMBO
Tue Mar 20 2018, 09:51 AM
bedo123
Mon Mar 19 2018, 07:48 AM

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ExperimenterUK Avatar
Posted By ExperimenterUK
Mon Apr 16 2018, 08:49 PM
On the diagram, a diode feeds a rectified sine wav...
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Posted By LAMBO
Mon Apr 16 2018, 06:39 AM
Hi sir i haven't connected any serial connec...
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Posted By ExperimenterUK
Fri Apr 13 2018, 02:09 AM
I assume you are doing this project.http://www.805...
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Posted By Praneeth1299
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I have used diptrace.I think ı have recevied from ...
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Sat Apr 07 2018, 01:45 AM
You will need to say which software you are using,...
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I have drawed many PCB board. But it is still not ...
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Posted By ExperimenterUK
Wed Apr 04 2018, 10:49 PM
Do you have a working HM2007 board as shown in the...