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

Thu May 25 2017, 05:25 AM
Monir Hossain
Can i change the 7-Segment are common pin ? And how to?
Mon May 08 2017, 12:45 PM
ivan muvunyi
please can you send me wiring diagram for automatic control of 3 phase induction motor for production of maize flour
Wed May 03 2017, 08:39 PM
imran qureshi
hello friend
Sun Apr 30 2017, 05:49 AM
Lijin G Varghese
Can u send me the circuit diagram for Program to interface GSM Module with 8051 microcontroller (AT89C51) using PC and LCD
Fri Apr 28 2017, 03:47 PM
SANDEEP T S
I need pcb wizard 3.5 version kindly send valid link of yours
ExperimenterUK
Mon Apr 17 2017, 11:56 PM
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Thu Apr 13 2017, 07:29 PM
Piyush Aughad
I want circuit & program for radar detection using Microcontroller 8051
Tue Apr 11 2017, 03:27 AM
Shabbir Ahmed
Hi Ajay ....hope you and your family all will be fine are you working on andriod aplications if yes then plz reply me
Sun Apr 09 2017, 06:33 PM
ATHULYA NAIR
Dear Sir, I need to know what are the complexity for programming in 8051 Microcontroller for three phase inverter?
Sun Apr 09 2017, 06:32 PM
ATHULYA NAIR
Dear Sir,

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Gaurav9527
Tue May 23 2017, 10:24 AM
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yogesh puri Avatar
Posted By yogesh puri
Thu May 25 2017, 10:33 PM
dear sirif i simulate the above program in keil it...
ExperimenterUK Avatar
Posted By ExperimenterUK
Wed May 24 2017, 09:42 PM
If you run the display in 4 bit mode and share pin...
ExperimenterUK Avatar
Posted By ExperimenterUK
Wed May 24 2017, 09:27 PM
Please post your code and Proteus file.
ExperimenterUK Avatar
Posted By ExperimenterUK
Wed May 24 2017, 09:23 PM
i am unable to simulate following code in protous...
ajay_bhargav Avatar
Posted By ajay_bhargav
Wed May 24 2017, 05:01 AM
Duplicate post of http://www.8051projects.net/t651...
ajay_bhargav Avatar
Posted By ajay_bhargav
Wed May 24 2017, 05:00 AM
All I can say looking at the post is "insufficient...
ajay_bhargav Avatar
Posted By ajay_bhargav
Wed May 24 2017, 04:58 AM
(the 3 motorsteppers need to move independently, b...
ajay_bhargav Avatar
Posted By ajay_bhargav
Wed May 24 2017, 04:55 AM
I am never sure with Proteus keypad. They always h...
yogesh puri Avatar
Posted By yogesh puri
Tue May 23 2017, 10:36 PM
i am unable to simulate following code in protous....
yogesh puri Avatar
Posted By yogesh puri
Tue May 23 2017, 10:34 PM
i am unable to simulate following code in protous...