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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:



Thank you Romel for this contribution. If anyone has doubts regarding this project, please use forum.
Tags digital tachometertachometer pic microcontrollerpic project digital tachometercontactless digital tachometer
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Conversation

Sun Oct 13 2019, 03:02 AM
Aline Hutchinson
Hey there,
ExperimenterUK
Sat Oct 12 2019, 11:23 PM
Log in.. then post your code in the 8051 forum
Sat Oct 12 2019, 11:18 AM
Bhadra Sajikumar
i am doing a countdown timer with 8051 for my project, unfortunately our professor had to take a leave of absence before he could teach us most of it.. can someone explain the .asm code of it for me?
Mon Sep 23 2019, 08:37 AM
Nathaniel
I am doing a project for my schools wireless security system with cameras,sensors and spot lights using 8051 micro controller, could you help me out with the design and its source code.
Wed Sep 18 2019, 09:48 PM
Caryn Kover
Thank you for your time,
ExperimenterUK
Mon Aug 05 2019, 08:09 PM
@Ismail ..post in forum, give details
Mon Aug 05 2019, 05:33 PM
Ismail balghmi
Hello. Please I won't download
ExperimenterUK
Wed Jul 24 2019, 01:47 AM
@BUSTER123 Please post in the forum
Tue Jul 23 2019, 07:13 PM
BUSTER123
hello! newbie here. i am kind of a guy who hates using ready - made existing libraries, so this helped a lot as i was trying to control and write to a character lcd display. however, i can't figure out how to set the cursor position. for example, i want to set it to the 5th column in the first row, so position 5. so according to the table, i am sending 10000101 on the 8 data lines of the lcd (register select pulled low). the cursor does not move there however. and i cant move the cursor left or right too. is it something wrong that i am doing? thank you.
ExperimenterUK
Thu Jul 11 2019, 08:55 PM
@ramos https://www.theengineeringprojects.com/2017/09/l298-motor-driver-library-proteus.html

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ilylily07
Tue Oct 15 2019, 04:32 PM
hientran123
Tue Oct 15 2019, 02:27 AM
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Thu Oct 03 2019, 09:53 AM
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Thu Oct 03 2019, 07:37 AM
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Fri Sep 20 2019, 04:53 PM
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s_dinesh40@yahoo.com Avatar
Posted By [email protected]
Thu Oct 17 2019, 09:38 PM
ExperimenterUK Avatar
Posted By ExperimenterUK
Thu Oct 17 2019, 08:35 PM
Do you understand how this code works?If so, addin...
s_dinesh40@yahoo.com Avatar
Posted By s_din[email protected]
Thu Oct 17 2019, 09:30 AM
i want to scroll message more than 2 dot matrix di...
ExperimenterUK Avatar
Posted By ExperimenterUK
Wed Oct 16 2019, 09:58 PM
What do you mean by "message scroll vertically" ?...
s_dinesh40@yahoo.com Avatar
Posted By [email protected]
Wed Oct 16 2019, 07:38 AM
s_dinesh40@yahoo.com Avatar
Posted By [email protected]
Wed Oct 16 2019, 07:13 AM
message scroll vertically, please share code.
ExperimenterUK Avatar
Posted By ExperimenterUK
Wed Oct 16 2019, 01:10 AM
Which camera ?What do you want the micro to do ?
ilylily07 Avatar
Posted By ilylily07
Tue Oct 15 2019, 04:43 PM
i need help.i don't know how to do it.is it possib...
ExperimenterUK Avatar
Posted By ExperimenterUK
Sun Oct 13 2019, 06:10 PM
This code does some scrolling.You will need to fin...
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Posted By ExperimenterUK
Sat Oct 12 2019, 10:19 PM
This code does not scroll, that will be complicate...