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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

Sat Dec 15 2018, 01:45 PM
Arslan ayoub
Hii ,, can I get the simulation of numeric keypad lock on proteus
ExperimenterUK
Mon Dec 03 2018, 05:17 PM
Please post questions in the forum. The chat box is for chat
Mon Dec 03 2018, 06:43 AM
help!me!
help! I don't understand busy flag!
Sun Dec 02 2018, 08:01 PM
ile
hello
Mon Nov 12 2018, 05:58 AM
Pavan_user
i have seen your replica of I2C programming using AT89C51 but i am unable to understand the "ack_bit" variable usage ...looks like it is always 1...can you elaborate how acknowledgment is working....
bgk3678
Tue Nov 06 2018, 02:36 PM
kindly any one give solution for my problem
ExperimenterUK
Mon Nov 05 2018, 09:48 PM
Pins high is the normal state. You need a program to set them low
mayengbam
Sun Nov 04 2018, 05:41 PM
hello, i am niranjoy, alll the port of my 8051 is always high, even i erase all the program. why is it so happen and what is the problem. any one please help me!
Sun Nov 04 2018, 02:16 PM
BASAVARAJ g kudamble
hi I am interfacing GSM 300 to 8051 microcontroller to receive message from mobile
ExperimenterUK
Sat Sep 29 2018, 06:28 PM
Please post questions in the forum.

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zhangd1v4bh1
Tue Dec 18 2018, 06:02 AM
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Thu Dec 13 2018, 01:52 PM
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Wed Dec 12 2018, 01:37 PM
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Fri Dec 07 2018, 10:11 AM
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Sun Dec 02 2018, 01:12 AM
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Thu Nov 29 2018, 03:43 PM
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Thu Nov 29 2018, 10:44 AM
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Mon Nov 26 2018, 05:18 AM

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Posted By sifirsekiz
Sun Dec 16 2018, 11:13 PM
Guys pleaseeeee :((
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Posted By sifirsekiz
Sat Dec 15 2018, 07:09 PM
HiThe pulse-sensor-amped has an analogue output.Th...
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Posted By ExperimenterUK
Sat Dec 15 2018, 07:01 PM
HiThe pulse-sensor-amped has an analogue output.Th...
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Posted By sifirsekiz
Sat Dec 15 2018, 09:02 AM
and ı have pulse sensor one out but anolog use 805...
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Sat Dec 15 2018, 08:56 AM
HiMembers can supply code and diagrams if they wan...
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HiMembers can supply code and diagrams if they wan...
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Hi guys I have max30100 pulse sensor need to measu...
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