Contactless tachometer using pic microcontroller: Contactless digital tachometer project is designed to measure speed of dc motor using PIC18F46K Simple but accurate digital tachometer using microcontroller Has a resolution of 1 rev/sec. The tachometer use an optical pickup scheme for picking . Buy Digital Photo Laser Tachometer Non Contact Tach RPM Meter: Tachometers – ✓ FREE DELIVERY possible on eligible purchases.
|Country:||Turks & Caicos Islands|
|Published (Last):||8 March 2009|
|PDF File Size:||15.93 Mb|
|ePub File Size:||1.75 Mb|
|Price:||Free* [*Free Regsitration Required]|
The circuit diagram of the digital tachometer is shown below. When viewed through an oscilloscope the collector waveform of the photo transistor Q4 2N would look like this:. Next part is the signal conditioning unit based on the opamp LM IC1. Only one opamp inside the quad LM is used here and it is wired as a comparator with reference voltage set at 3. The job of this comparator unit is to convert the spiky collector wave form into a neat square pulse train so that it can be applied to the microcontroller.
Every time the collector voltage of the photo transistor goes below 3.
From the above two graphs you can tafhometer that the tacometer going edge of the waveform indicates the passage of the reflective patch across the sensor and that means one revolution. For the counting purpose both the timers of Timer0 and Timer1 are used. Timer 1 is configured as an 8 bit auto reload counter for registering the number of incoming zero going pulses and Timer0 is configured as a 16 bit timer which generate the necessary 1 second time span for the Timer1 to count.
The instruction CPL A will just complement the digit drive pattern in accumulator so that it becomes suitable for the common anode display. This is done just because to save my time but not a text book method.
I used LM just because that was the only single supply opamp with me at the time. You can use any single supply opamp that matches our supply voltage 5V. Dual supply opamps configured in single supply mode will not give results like a dedicated single supply opamp in the same situation. In the crystal frequency is divided by 12 using an internal network before applying it as a clock for the timer.
Go through this article Delay using timer for a better grasp. The output is given in rpm revolutions per minute and the number of digits are increased from 3 to 5.
Also, there is a change in the sensor circuit. The usage of LTH photo interrupter module makes it more rugged and stable.
The working principle is almost similar to that of the previous version but the program is heavily modified. The circuit diagram of the LCD tachometer using is given below. The program tachomter counts the number of negative going pulses in 1. I want to ask whether the mechanism in this project counts the pulses for 60 seconds and then display it if so then how contactlwss configure to delay time for 60 sec and at the same time count the pulses in ckntactless duration?
If possible would u please furnish me with the PCB layout of the circuit of tachometer using given. I have a problem in the optical pick up assembly.
Hae there,i want to make the tracometer but a few things are troubling me. You an use Keil to code, compile and test the program code.
For this setup and every other setup based on principle of reflection of light the IR LED and the photo-sensor are placed side-by-side at a distance of mm from each other facing the obstruction which is generally less than 10cm away from the tip of IR LED.
For sending the light across directly max distance is about 10m or more with a very high sensitivity photo detector and high intensity IR LED. But this distance varies according to the climatic conditions in the region and also other devices operating in the area. Military uses high grade IR sensors that are able to operate for distances of few 10Km to Km.
For project purpose of measurement a distance below 1meter is suitable, but higher distances are possible if sensors are properly calibrated. C remotes use IR sensors to operate. I have tested my T. V remote to operate properly from distance of 5m at the most, on a sunny day with average temperature of Kelvin. You have to test and calibrate your sensors based on application.
: Digital Photo Laser Tachometer Non Contact Tach RPM Meter: Automotive
Thank you for all. What you use to program the ? Any special interface cable? I use an In system programmer ISP module for programming the The user interface for programming the microcontroller comes with the ISP module.
Contactless digital tachometer using 3 digit display and measures upto rev/sec
The module is tacho,eter to the PC through serial port. Dear Sir, Kindly provide C code gachometer better understanding. Your email address will not be published. Digital tachometer using admin April 20, 39 Comments. Contactless digital tachometer using Digital tachometer using LCD tachometertachometer using Previous post Next post.
You may also like: Interfacing Nokia Display to Micro Controller Moisture sensing automatic plant watering system using Heart rate monitor with sms alert.
Design of a Contactless tachometer
Can you Provide an lcd version of it please! Tqchometer this circuit be purchased on this site? We are working on the layout part! Will be updated on this page.
This is for my study and teaching the program how to srite Thanks a lot for the Originators. What is the use of burner circuit of microcontroller in this clntactless Can you feed me thw same circuit with high sensitivity. Leave a Reply Cancel reply Your email address will not be published.