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 Aug 19 2014, 04:51 PM
allen ndumu
please i will like to know if the problem of speed control of dc motor using keypad and l298 was if yes can i have the complete project send it to the address i really need to see it
Tue Aug 19 2014, 10:47 AM
Amit Bisht
sir i want to have some trending projects on which i could work related to ATmega 16 microcontroller
ExperimenterUK
Sat Aug 16 2014, 04:16 PM
@diligent . create a thread
Sat Aug 16 2014, 03:17 PM
diligent
in assembly langauage programming..
Sat Aug 16 2014, 03:14 PM
diligent
will anyone help me?
Thu Aug 14 2014, 10:24 PM
Amirudin Tone
i help, i need liberary IC 4047 in the proteus. thanks
ExperimenterUK
Thu Aug 14 2014, 03:59 PM
@NARAYANA are you getting an error ?
Tue Aug 12 2014, 11:47 PM
NARAYANA
i am not able to get reg please provide me registration link
Tue Aug 12 2014, 10:32 AM
saloni
sir I was needing literature survey of''ANDROID CONTROLLED SPY ROBOT USING MICROCONTROLLER"
ajay_bhargav
Mon Aug 11 2014, 12:30 PM
@nisargpatel and @NARAYANA please post questions in forum.

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samchovatiya
Thu Aug 21 2014, 02:30 PM
hasmukhjain
Wed Aug 20 2014, 06:28 AM
rablo
Tue Aug 19 2014, 10:10 AM
faizhameed
Tue Aug 12 2014, 10:39 PM
ind3siszive
Sun Aug 10 2014, 01:05 PM
snaxxx68
Sat Aug 09 2014, 11:06 AM
[email protected]
Sat Aug 09 2014, 08:58 AM
rajiabdul
Mon Aug 04 2014, 01:31 PM

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gaurav7577 Avatar
Posted By gaurav7577
Fri Aug 22 2014, 01:30 AM
thnks for rply..i hav attached error pic here...pl...
ajay_bhargav Avatar
Posted By ajay_bhargav
Fri Aug 22 2014, 12:46 AM
It is clearly mention with segment name on the pin...
ajay_bhargav Avatar
Posted By ajay_bhargav
Fri Aug 22 2014, 12:42 AM
What is the error that you're getting?
samchovatiya Avatar
Posted By samchovatiya
Thu Aug 21 2014, 02:57 PM
I want to know that in my project of Simple Digita...
gaurav7577 Avatar
Posted By gaurav7577
Thu Aug 21 2014, 05:47 AM
Hi..I hav lpc 2148 dev board from nex Robotics. I ...
hasmukhjain Avatar
Posted By hasmukhjain
Thu Aug 21 2014, 01:50 AM
for that try to add a variable wch can save your p...
jayachandra Avatar
Posted By jayachandra
Wed Aug 20 2014, 08:11 AM
thanq for reply @hasmukhjain,actually my applicati...
hasmukhjain Avatar
Posted By hasmukhjain
Wed Aug 20 2014, 06:40 AM
Hi Mr jayachandra,I feel ur if statement for switc...
nisargpatel Avatar
Posted By nisargpatel
Wed Aug 20 2014, 01:29 AM
see we are measuring electrical parameters by CT, ...
jayachandra Avatar
Posted By jayachandra
Tue Aug 19 2014, 08:22 AM
HELLOim facing problem with eeprom, i wrote a prog...