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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Conversation

Mon Mar 30 2015, 04:51 PM
Peter james
can any one provide me an assembly language program to interface with 16x2 LCD, 4X4 Keypad and a GSM Module to recieve message and display it.
ajay_bhargav
Mon Mar 23 2015, 04:22 AM
You can only simulate simple 8051. RD2 support is not there in proteus. However there are similar atmel varient which can be used instead.
Sun Mar 22 2015, 07:24 PM
Aryan Nath
How can i Simulate microcontroller project in Proteus that uses P89V51RD2
Thu Mar 19 2015, 02:45 PM
Peter Mann
I have tried to register on the site, but it keeps saying I've entered two different email adresses - but I haven't!
ajay_bhargav
Sun Mar 15 2015, 08:25 PM
I did not get new message indication.. strange..
ExperimenterUK
Sun Mar 15 2015, 08:18 PM
slight delay, my connection failed
ajay_bhargav
Sun Mar 15 2015, 08:08 PM
Atleast you chat on our website if not anywhere else
ajay_bhargav
Sun Mar 15 2015, 08:08 PM
Hi Phil..
ExperimenterUK
Sun Mar 15 2015, 08:05 PM
Hi Ajay
gsdvprasad
Fri Mar 13 2015, 04:20 PM
Can you help me how to change the text on led display in proteus simulation?

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harix
Sun Mar 29 2015, 07:11 PM
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Fri Mar 27 2015, 03:07 PM
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Thu Mar 26 2015, 07:27 AM
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Wed Mar 25 2015, 06:27 AM
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Tue Mar 24 2015, 12:40 PM
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Tue Mar 24 2015, 08:22 AM

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diana1234 Avatar
Posted By diana1234
Mon Mar 30 2015, 08:12 AM
Dear sir,How a resistor can be used as a current l...
ExperimenterUK Avatar
Posted By ExperimenterUK
Mon Mar 30 2015, 05:13 AM
The processor on the MCB2300 has a built in DAC.Cr...
iamalien Avatar
Posted By iamalien
Sun Mar 29 2015, 07:46 PM
yes either that or use the flash reprogrammable va...
ajay_bhargav Avatar
Posted By ajay_bhargav
Sun Mar 29 2015, 07:37 PM
Correct, you cannot change ROM, but you can still ...
iamalien Avatar
Posted By iamalien
Sun Mar 29 2015, 07:25 PM
i am using at89s52 i guess it is only isp not iap,...
ajay_bhargav Avatar
Posted By ajay_bhargav
Sun Mar 29 2015, 07:22 PM
Ianalien is right. But you can do this without usi...
ajay_bhargav Avatar
Posted By ajay_bhargav
Sun Mar 29 2015, 07:19 PM
EEPROM can be changed at runtime. Program memory c...
ajay_bhargav Avatar
Posted By ajay_bhargav
Sun Mar 29 2015, 07:11 PM
We have digital clock project with 4 line lcd. It ...
ajay_bhargav Avatar
Posted By ajay_bhargav
Sun Mar 29 2015, 07:07 PM
It may be possible that interrupt pin may be used ...
ajay_bhargav Avatar
Posted By ajay_bhargav
Sun Mar 29 2015, 06:58 PM
As per majoka, if you have installed the crack pro...