Find us on Facebook View our Youtube Channel View us on Instagram Follow us on Twitter
Shopping Cart
0 Items
Total: $0.00
Shopping Cart | Login

How to Use a Solderless Breadboard
Written By: John R. Sewell

Every now and again we come upon the need to know the “speed” of something. In the electro-mechanical field we usually want to know the Revolutions per unit of time, usually in minutes; which gives us the term; RPM or Revolutions per Minute. At real slow speeds we can put a mark on the shaft and count the marks for a minute. Simple enough but above 60/sec it can get real tedious to count. The advent of the LASER/LED Photo Tachometers the need for speed became much easier. Basic aim, press the trigger, hold for a few seconds and read the display; Laser Tachometer BUT here again there are a few basic things to understand about LASER Tachometer operation. They are a light source, light detector, a counter and an accurate time gate. The LASER/LED provides a light source, the detector receives the reflected light and the time gate enables the counter for a precise amount of time. How we get these light pulses back to the detector can be a challenge. If the moving surface is too uniform in contrast and reflectance, we get no pulse to count, so we need to make part of shaft a non reflecting, or contrasting surface. If the shaft is readily available say sitting on the bench, you just color part of the shaft an even, contrasting color. We use a black marker to color half or more of the shaft. Now we have an On/Off reflectance of the LASER/LED light that can be counted. As long as you can get a uniform reflectance sequence, the LASER Tachometer will read it. With a small Axial fan, we just stick a piece of aluminum foil on the edge of the rotating motor hub. If the hub is not reachable then stick foil to a blade. Sometimes sticking something is not possible, so then we put something reflective or contrasting behind the blades. We just divide the displayed RPM by the number of blades.

Be sure that you have enough contrasting surface so that most of the light spot from the LASER Tachometer is within the area of the contrasting mark(s) or space on the rotating part. Be sure the light beam is at its most focused point on the rotating object. With most of today’s economical LASER Tachometers this focus distance is around 6-12 inches. Remember that the LASER/LED Photo tachometer must be able to “See” the rotating object. It can’t read through a opaque cover or around a corner! Flickering ambient AC Powered lights can have an affect so less interfering light the better.
Informational Articles
How to Use a Solderless Breadboard
How to Use a Solder Station
How does an LED Work
How to Use a Variable Benchtop Power Supply
How does a Power Transformer Work
How does a Stepper Motor Work
How does an IEC Power Cord Work
How to Determine LED Brightness
Using a Digital Multimeter
How to Use a Laser Tachometer
How to Use a IR Digital Temperature Device
How to Use a Peltier Module
How to Read Resistors
How to Use High Brightness LEDs
Understanding Basic Scientific Notation
Meter Safety Category Listing
How to Use a Panel Meter
How to Use an AC Clamp Meter
Understanding Regulated and Unregulated Power Supplies
Understanding High Brightness LED Buzz Words

Power Supplies
Benchtop Power Supplies
Solder Stations
12 Volt Power Supply
Solderless Breadboards
Digital Multimeters
Digital Panel Meters
DC Axial Brushless Fans
IEC Power Cords
Arduino Compatible Boards
Electronic Enclosures and Boxes
Stepper Motors and Drivers
24 Volt Power Supply
Adapter Power Supplies
Sub-Mini Toggle Switches
Mini Toggle Switches
Heat Shrink Tubing
Power Transformers
View Orders
Update Profile
View Cart
View Wish List
Support Files
Information Articles
"How To" Videos
FREE Catalog
Email Signup
Ordering Info.
Shipping Info.
Privacy Statement
Contact Us
Directions to our Store
Find us on Facebook View our Youtube Channel View us on Instagram Follow us on Twitter

Copyright © 1997-2022 MPJA.com - All Rights Reserved
Send mail to MPJA.com with questions or comments about this web site.
Site Designed by NiteOwl Computing