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Measure RPM DIY Portable Digital Tachometer

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Measure RPM DIY Portable Digital Tachometer
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  http://www.instructables.com/id/Measure-RPM-DIY-Portable-Digital-Tachometer/  Food   Living   Outside   Play   Technology   Workshop Measure RPM - Optical Tachometer by electro18  on September 17, 2014 Table of Contents Measure RPM - Optical Tachometer ...............................................................................................1 Intro: Measure RPM - Optical Tachometer ........................................................................................2 File Downloads ...........................................................................................................2 Step 1: Part List : ..........................................................................................................3 Step 2: Build the sensor .....................................................................................................4 Step 3: Making the sensor board ...............................................................................................6 Step 4: The 3-pin LCD .......................................................................................................7 Step 5: Make the box .......................................................................................................8 Step 6: Finishing Touch ......................................................................................................9 Step 7: Program ...........................................................................................................10 Step 8: Explanation and Calculation ............................................................................................11 Step 9: Testing and Troubleshooting ............................................................................................11 Step 10: Conclusion ........................................................................................................12 Related Instructables ........................................................................................................12 Advertisements ...............................................................................................................12 Comments ................................................................................................................12  http://www.instructables.com/id/Measure-RPM-DIY-Portable-Digital-Tachometer/  Author: electro18 Hey there ! I'm an electronic hobbyist interested in making robots and sharing stuff. I hope that my instructables help you in solving your problems HappyTinkering ! Intro: Measure RPM - Optical Tachometer This Instructable will show you how to make a Portable Digital Optical Tachometer using an Arduino Uno. This project is inspired from This instructable and is anenhanced version of it with an LCD display and a modified code.Instead of a slotted sensor , it has a reflection based sensor. So :1. You don't have to worry about the thickness of the rotor2. The number of blades won't change your readings3. It can also read the RPM of drum style rotors which slotted sensor can't What is a tachometer ? A tachometer is a device used to measure the RPM or Revolutions Per Minute of any rotating body. Tachometers can be contact based or non-contact ones. The non-contact or contact-less optical tachometers usually use laser or Infrared beam to monitor the rotation of any body. This is done by calculating time taken for one rotation. FEATURES  It can measure RPM over 20k Sensor range extends upto 7~8 cm Displays Maximum RPM when left IdleAutomatically toggles modes from Idle to reading Can be adjusted to match the ambient lighting conditionsIt is comparatively cheap and easy to buildCan work without an LCDProgrammable and supportscustomization Connect an SD card to the Arduino to keep logs File Downloads LCD_TACHOMETER.ino  (3 KB)  http://www.instructables.com/id/Measure-RPM-DIY-Portable-Digital-Tachometer/  [NOTE: When saving, if you see .tmp as the file ext, rename it to 'LCD_TACHOMETER.ino'] Step 1: Part List : Electronics ArduinoResistors - 33k , 270 ohm , 10k potentiometerLED - blueIR LED and Photodiode16 x 2 LCD74HC595 shift RegisterRibbon cable ( 3 wire )Perfboard and headers Tools and Hardware Soldering IronSolderPinsScrewsMotors and DC fan  http://www.instructables.com/id/Measure-RPM-DIY-Portable-Digital-Tachometer/  Step 2: Build the sensor For the sensor you'll need an IR LED and a Photodiode. 1. Start by sanding the LED and photodiode to make it flat ( do not sand it too much or you'll destroy it ).2. Then fold a strip of paper sheet as shown. Make two such Structures so that the LED and Photodiode fit tightly into it. Joint these together by glue and paint themblack.3. Insert your LED and Photodiode in them in such a way that the positive ( longer ) lead of the LED is right above the shorter lead of the photodiode.4. Glue them into the cover using superglue and solder the positive ( longer ) lead of the LED to the shorter lead of the photodiode.5. Solder the 3 wire ribbon cable to the remaining leads In my case :1. Orange wire --> LED's positive pin and photodiode's shorter lead2. Yellow wire --> photodiode's longer lead3. Green Wire --> LED's ground pinYou're ready to make the board >>
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