Basic Level     Skills: Not specified    
Author

Description

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
  Filesize

4.25 MB

  Downloads

97727

  Rating
 

Comments

Conversation

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
Sun Apr 30 2017, 05:48 AM
Lijin G Varghese
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
Fri Apr 28 2017, 03:46 PM
SANDEEP T S
I need pcb wizard 3.5 version
ExperimenterUK
Mon Apr 17 2017, 11:56 PM
Sorry..We had a problem with registration.Confirmation emails were not sent.Please re-register
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,
Sun Apr 09 2017, 04:43 AM
Rohit chandra joshi
Sir I need ur help urgently.i am trying to make pc controlled led scrolling display using 8051.when i am trying to generate hex file of the code that is given by pratik suthar.it gives the error Target not created Limit:0800h I am using keil uvision4 software. Even i have tried to burn the given hex file that is atteched with the code but my led are not glowing. Pls help me sir .i struck in this problem from last month and till now i am not able to short out the problem. Pls suggest me to solve the problem.mail me at [email protected] Thanks

Downloads

Comments

anshulece
Fri Apr 28 2017, 03:43 PM
Masoooud
Tue Apr 25 2017, 06:57 PM
BOuissal
Mon Apr 24 2017, 02:46 PM
tranhunga
Mon Apr 24 2017, 01:11 AM
Suslik
Sun Apr 23 2017, 09:26 AM
soumk
Sun Apr 23 2017, 06:22 AM
Vavachi1996
Tue Apr 18 2017, 08:01 PM
yasmine
Tue Apr 18 2017, 03:10 PM

Online

Guests: 66, Members: 0 ...

most ever online: 182184
(Members: , Guests: 182184) on 06 Aug 2010: 05:37 AM

Members: 37814
Newest member: anshulece
Forum Activity
Deepakvaishu Avatar
Posted By Deepakvaishu
Fri Apr 28 2017, 11:18 AM
Yes proteus is loaded ,with all projects.....Once ...
ExperimenterUK Avatar
Posted By ExperimenterUK
Fri Apr 28 2017, 05:06 AM
Does Proteus load at all ?Does it only crash on c...
Deepakvaishu Avatar
Posted By Deepakvaishu
Wed Apr 26 2017, 06:59 AM
hello...I am getting an error when I am trying to ...
ExperimenterUK Avatar
Posted By ExperimenterUK
Tue Apr 18 2017, 10:52 PM
Thanks for the comment.Glad you got it working.
Deepakvaishu Avatar
Posted By Deepakvaishu
Tue Apr 18 2017, 06:19 AM
Thank you very much...Today I got the output for a...
ExperimenterUK Avatar
Posted By ExperimenterUK
Thu Apr 06 2017, 05:38 PM
Is it initially assigned as '0', and then when the...
Deepakvaishu Avatar
Posted By Deepakvaishu
Thu Apr 06 2017, 07:55 AM
hello,Thanks for the attachment.I have gone throug...
ExperimenterUK Avatar
Posted By ExperimenterUK
Sat Mar 25 2017, 09:49 PM
I have attached code showing one method you could ...
Deepakvaishu Avatar
Posted By Deepakvaishu
Sat Mar 25 2017, 07:59 AM
I am using Keil and 8051 microcontroller
ExperimenterUK Avatar
Posted By ExperimenterUK
Fri Mar 24 2017, 06:05 PM
The best way is to use an interrupt to run the cou...