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.

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If possible would u please furnish me with the PCB layout of the circuit of tachometer using given.

Technical Details

The Microcontroller is programmed such that when the output of the counter attains a value above a fixed value in this paper the value is fixed at 29 rpsit sends a high signal to its MSB 7th pin of port C which is connected in series with an LED and a buzzer. The circuit diagram of the digital tachometer is shown below. I used frequently in the shop to check speed of equipment. These days arduino boards comes with atmega P-PU.

You may also like: The speed of the motor can be also controlled using the same circuit. We invite you to learn more about Fulfillment by Amazon.

Design of a Contactless tachometer

When connected first, the LCD may not show up anything. RPM can be determined by counting the number of upward shoots in a given interval of time. Amazon Restaurants Food delivery from local restaurants. The voltage at this pin is converted into a value between 0 and using the anlogRead function.


Super cheap, but confactless value!

The LED and the buzzer connect to the microcontroller which monitors the speed of the motor. As the name indicates, it can very accurately measure the rotational speed of a shaft without even touching it.

Contactless digital tachometer using 3 digit display and measures upto rev/sec

There is not much to say after that. Go through this article Delay using timer for a better grasp.

Keep this in mind while selecting the load. Leave a Reply Cancel reply Your email address will not be published. The lateral surface of the photo transistor must be masked using a tape. I hope this helpsit worksand beyond that–I have explained how and some of the issues I noticed. I used it to confirm the speed of a three phase blower fan in a transmitter after reinstalling it after having the bearings replaced to make sure I had all three phases wired in the right order.

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It can measure RPS speed up to the desired value, depends on the speed of the motor. Resistor R2 limits the current through the IR diode. Amazon Renewed Refurbished products with a warranty.


Share your thoughts with other customers. It can measure time interval with better accuracy. You have to give it a moment for the reading to settle down, but you’ll get an accurate speed when you do. Fulfillment by Amazon FBA is a service we offer sellers that lets them store their products in Amazon’s fulfillment centers, and we directly pack, ship, and provide customer service for these products.

This device is built on a microcontroller – ATmega16, speed is detected using the IR transmitter and receiver pair, readings are displayed using a 16×2 LCD display and the speed limit is indicated by an LED and a buzzer.

The reflective strips are pretty much worthless over RPM- not enough stick to overcome the centrifugal force. Amazon Advertising Find, attract, and engage customers. As the motor runs, the IR transmitter fitted with the cardboard also rotates with it. See all reviews. In the circuit we have placed the IR transmitter and receiver at either side of the DC motor such that both are in line.

Only one opamp inside the quad LM is used here and it is wired as a comparator with reference voltage set at 3.