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.
printer friendly create pdf of this news item

Submit comment

(Required; Min length 5)
(Required; will not be displayed)

Conversation

Thu Aug 27 2015, 10:03 AM
Nilesh Thakre
anybody please help me ,i face problem reading a message and identify the string of read message (8051 uc with sim300 gsm modem i have use)
ajay_bhargav
Thu Aug 27 2015, 07:17 AM
@KRIZZA, make the circuit, and load hex file you're done.
Thu Aug 27 2015, 03:39 AM
sk nawal
arm control ckt
Mon Aug 24 2015, 02:11 AM
KRIZZA
@ExperimenterUK BUILD PROJECT LIKE THIS
gkn06
Thu Aug 20 2015, 03:17 AM
hello anybody please
Wed Aug 19 2015, 09:48 AM
Kiruba
I am new to ARM Development..I need help
Tue Aug 18 2015, 09:34 AM
mairja naser
pic30f2010 ic usb copy
ExperimenterUK
Mon Aug 17 2015, 10:32 PM
@krizza build what ?
Mon Aug 17 2015, 10:44 AM
Adonis Canlom
Hello, I’d like to inquire if it’s possible to purchase advertising space on 8051projects.net. If there is any space available please let me know and we could discuss further details. I’m looking forward to your positive reply. Thanks, Adonis
Sun Aug 16 2015, 12:35 PM
krizza
I already have th ic but what is the other materials

Downloads

Comments

syahaikas102
Wed Aug 26 2015, 02:03 PM
iscode
Fri Aug 21 2015, 11:19 PM
JunkmanXL
Thu Aug 20 2015, 11:55 AM
pari@3120
Thu Aug 20 2015, 07:07 AM
gkn06
Wed Aug 19 2015, 09:50 AM
mopatihanuman
Tue Aug 18 2015, 12:47 PM
gebrish
Thu Aug 13 2015, 08:26 AM
casha
Fri Aug 07 2015, 07:42 AM

Online

Guests: 40, Members: 0 ...

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

Members: 37687
Newest member: syahaikas102
Forum Activity
nordic Avatar
Posted By nordic
Mon Aug 31 2015, 03:37 PM
Hello, I need a help for my project. I want to cha...
ajay_bhargav Avatar
Posted By ajay_bhargav
Mon Aug 31 2015, 06:45 AM
[Topic moved to PIC microcontroller discussion for...
ajay_bhargav Avatar
Posted By ajay_bhargav
Mon Aug 31 2015, 06:44 AM
can you provide code for "USARTReadData();" I doub...
ajay_bhargav Avatar
Posted By ajay_bhargav
Mon Aug 31 2015, 06:43 AM
Here are the sample codes: Attach...
pravin_35 Avatar
Posted By pravin_35
Sat Aug 29 2015, 08:25 AM
Hi every one ,I need a help how to compare the Usa...
gkn06 Avatar
Posted By gkn06
Thu Aug 27 2015, 02:52 PM
ok! to start with which IDE or compiler you're pla...
ajay_bhargav Avatar
Posted By ajay_bhargav
Thu Aug 27 2015, 07:05 AM
ok! to start with which IDE or compiler you're pla...
abdul991 Avatar
Posted By abdul991
Sat Aug 22 2015, 06:07 PM
1. Its a pratical task...2. SNMP manager is implem...
gkn06 Avatar
Posted By gkn06
Wed Aug 19 2015, 10:18 AM
My project is to interface several serial interfac...
ExperimenterUK Avatar
Posted By ExperimenterUK
Mon Aug 17 2015, 10:13 PM
Let me start by saying that I have no experience w...