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

Tue Nov 29 2016, 02:49 PM
jaykumar
Dear sir, elevator microprocessor control , the vendor locked the control, pls help me how can we decode the password
Sat Nov 26 2016, 10:24 AM
manikanta B
hello i know about gsm,gps and zigbee but i dont know how to use them while programming. can anyone suggest me how to use them
ExperimenterUK
Sat Nov 19 2016, 07:09 PM
@Protaz.. Really you would be better off asking on one of the many Arduino user sites
Fri Nov 18 2016, 05:39 AM
Protaz
Hi, am new in programing, but I have few skills in electronic. I want to make an automatic timing system for institutions using arduino uno. Any one to assist me how to program the microcontoller?
Tue Nov 15 2016, 04:45 AM
Hemangi patel
hello, i am working on atmega128 board and i want to interface with sd card with using fat32 file system. i am totaly new in this field .so pls anyone can u suggest me some imp links.thanks
Thu Nov 10 2016, 01:40 PM
ajith raj
hi frds i make voice control robot using blutooth module
Wed Oct 26 2016, 08:23 AM
ishalt
is it possible to completly get the robot running from java code
Sun Oct 23 2016, 05:50 PM
mamata thakur
plz send full mini project report for ic 741&ic 555 tester
Wed Oct 19 2016, 03:30 PM
riddhi1296
can you provide an explanation for the inverter 8051 code and how it works
ExperimenterUK
Sat Oct 15 2016, 12:15 AM
@snaya. Create a thread in the 8051 forum for your questions

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Jonathan.kei
Mon Nov 21 2016, 04:30 PM
AVRuser1
Sun Nov 20 2016, 06:07 PM
JaguarPaw
Thu Nov 17 2016, 07:44 PM
PeterJohn
Mon Nov 14 2016, 05:54 PM
evigna
Wed Nov 02 2016, 02:03 PM
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Thu Oct 27 2016, 01:54 PM
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Fri Oct 21 2016, 10:35 PM
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Sat Oct 15 2016, 09:40 AM

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Centurio Avatar
Posted By Centurio
Mon Nov 28 2016, 08:46 AM
Hi there,long time ago... i've a short question to...
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Posted By kirangowle
Wed Nov 16 2016, 03:56 PM
Hello Forum members,After a long time i am back to...
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Posted By Pratik_Suthar
Thu Oct 13 2016, 12:39 PM
@martin the HEX file provided in the project is no...
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Posted By ajay_bhargav
Thu Oct 06 2016, 06:15 AM
Hi Phil, Do you want to add this to existing proje...
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Posted By ajay_bhargav
Thu Oct 06 2016, 06:13 AM
CE should be high when you go for reading mode/wai...
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Posted By ajay_bhargav
Thu Oct 06 2016, 06:03 AM
You can also use ESP8266 with its SDK to write app...
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Posted By ExperimenterUK
Mon Oct 03 2016, 11:15 PM
This is an old thread and the links no longer work...
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Posted By martinsnc115877
Wed Sep 14 2016, 12:51 PM
sir, i did your led scrolling mass display, and it...
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Posted By ExperimenterUK
Fri Sep 09 2016, 11:45 PM
The Hex file for this project is a bit too big for...