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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

ExperimenterUK
Sat Mar 25 2017, 09:56 PM
@Noreen I suggest you log in and post a full description of what you need in our PIC forum
Sat Mar 25 2017, 03:10 PM
Noreen
Hello I worked on a project related to Wireless Electricity theft detection using GSM during my bachelors. I used Nokia 6230 for sending sms using AT commands. I chose to work with SMS text mode. The microcontroller I used was PIC16F877A and its software coding done through PIC Basic Pro. Unfortunately, I lost my account password and do not have coding for generation sms using AT commands. I need that coding. Can some one help me to provide complete Pic Basic Pro code. In which step by step guidance is given so that I can understand easily. Regards,
Wed Mar 22 2017, 09:13 PM
ajay kumar
help me nokia lcd light
Wed Feb 22 2017, 06:14 AM
ChollyMo
Indeed, on the LCD tutorial, many missing Tables and figures !!
Wed Feb 22 2017, 06:06 AM
ChollyMo
I don't see any Table 3. I'm using Chrome.
Fri Feb 03 2017, 05:56 AM
irfan shaikh
hi, i want interface WS2811 pixel led using NUVOTON N79E352, but i dont know how to code it. can anyone help me or provide me sample coding for interfacing WS2811 PIXEL LED. THNX
Thu Jan 19 2017, 08:42 PM
abhays
Hi...i have made a circuit for interfacing PT100 with LM358 whose temperature is shown on the LCD...But the temperature is not getting incresed slowly ..a small change directly increses the temp...can any one help me
Thu Jan 19 2017, 04:27 PM
roba
send me alarm clock simulation using proteus software
Mon Jan 16 2017, 03:15 PM
Rutuja
How can we read notepad file using random acess file
Fri Jan 06 2017, 06:18 AM
muhammad Umar
i need cd4047 library file for protious please help me i s

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SAUnwin
Tue Mar 21 2017, 02:29 PM
letonarolikah
Mon Mar 20 2017, 11:21 AM
nerodear
Tue Mar 14 2017, 07:08 AM
XuZiling
Wed Feb 22 2017, 02:40 AM
diwakar_96
Thu Feb 16 2017, 02:40 PM
Helia
Thu Feb 09 2017, 09:59 AM
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Sat Jan 28 2017, 08:58 AM
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Tue Jan 17 2017, 06:25 PM

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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...
Deepakvaishu Avatar
Posted By Deepakvaishu
Fri Mar 24 2017, 05:22 AM
Hi,I got that we should use timer......But I am a ...
ExperimenterUK Avatar
Posted By ExperimenterUK
Thu Mar 23 2017, 09:14 PM
You have largely answered your own question.Use on...
ExperimenterUK Avatar
Posted By ExperimenterUK
Thu Mar 23 2017, 07:03 AM
I have looked at your code.I think you are confuse...
Deepakvaishu Avatar
Posted By Deepakvaishu
Thu Mar 23 2017, 05:34 AM
hello,I can type the letters now when the particul...
SAUnwin Avatar
Posted By SAUnwin
Tue Mar 21 2017, 02:55 PM
HI,There are two ways I'd tackle thiss.Key down on...
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Posted By Deepakvaishu
Mon Mar 20 2017, 08:24 AM
hello,I am using a keypad to type the text message...
Helia Avatar
Posted By Helia
Thu Mar 16 2017, 09:15 AM
hi.. the following code is not working on hardware...