loading
1Instructables10,433Views53 CommentsOrlando area, Florida, USA (Disney World, etc !)
Retired electro-optical engineer. Education:M.S. in Physics. Married 56 years.(same woman!)

Tell us about yourself!

Complete Your Profile

Achievements

10K+ Views Earned a bronze medal
Show 0 More »
  • "With U Smart Sole" DIY GPS Embedded Smart Shoe sole #MITBetterWorld

    Impressive project.But will probably have false alarms when accidentally crossing feet.Can eliminate this problem by requiring two fairly quick crossings. Give only a vibration warning at first crossing to alert the user.

    View Instructable »
  • dick55 commented on KJMagnetics's instructable World's Simplest Electric Train3 weeks ago
    World's Simplest Electric Train

    DA6 magnets really stick together! I couldn't slip one off the other. So I made a simple tool to make it easier. I drilled a 5/8 inch hole, slightly less than 3/8 inch deep, centered in the long side of a piece of 2x4 wood. This supports one magnet while pushing firmly down on the other and makes it easy to separate it at the bottom of the slide.I also verified that it is easy for them to give you a bloody pinch if you are not very careful !

    I've been thinking about using a table saw to cut a length-wise slit in "1/2 inch" PVC pipe, then using steel spring wire on the magnets to maintain contact with a coil wound around the outside of the pipe. The inner diameter of 1/2 inch (normal-pressure Schedule 40) PVC pipe averages 0.622 inch, which is almost exactly the stated diameter of the 5/8 (0.625) inch DA6 magnets. Actually, my magnets measure less than 5/8 inch diameter. I took my battery/magnet assembly and dropped it into 1/2 inch pipe and it passed easily through a 3 foot length. I haven't researched conductive spring wire (or other ferrous-type material) which should lightly drag on the coil and contact more than one coil at a time.Minimum wall thickness of the pipe is 0.109 inch, so the coil diameter is large...see more »I've been thinking about using a table saw to cut a length-wise slit in "1/2 inch" PVC pipe, then using steel spring wire on the magnets to maintain contact with a coil wound around the outside of the pipe. The inner diameter of 1/2 inch (normal-pressure Schedule 40) PVC pipe averages 0.622 inch, which is almost exactly the stated diameter of the 5/8 (0.625) inch DA6 magnets. Actually, my magnets measure less than 5/8 inch diameter. I took my battery/magnet assembly and dropped it into 1/2 inch pipe and it passed easily through a 3 foot length. I haven't researched conductive spring wire (or other ferrous-type material) which should lightly drag on the coil and contact more than one coil at a time.Minimum wall thickness of the pipe is 0.109 inch, so the coil diameter is larger than one wound on a 5/8 inch dowel. However, the magnetic field strength at coil center is not a function of diameter; it only depends on current and number of turns. Also, the PVC wall material should not affect the field.

    View Instructable »
  • dick55 commented on KJMagnetics's instructable World's Simplest Electric Train1 month ago
    World's Simplest Electric Train

    Actually this is a self-powered solenoid.

    View Instructable »
  • dick55 commented on perrytsao's instructable Fly a mini-drone with your computer!5 months ago
    Fly a mini-drone with your computer!

    Impressive project. There is a lot to learn here: using OpenCV2 to track the drone with camera input to a PC; communicating with the drone's receiver using a compatible transmitter and understanding the command format; and closed loop control dynamics. Not a simple undertaking.

    View Instructable »
  • Multi-DIY Humidity Sensor + Irrigating System

    For a moisture sensor I used thin copper tubes available in 12" lengths at Ace Hardware. Attaching wire is easy; just insert bare wire in end of tube and hammer shut. I used mine buried in the lawn to control a sprinkler system. I applied voltage only when making a measurement. Keeping the current flowing continuously can speed up corrosion.

    View Instructable »
  • dick55 commented on AlexGyver's instructable DIY vacuum chamber for experiments6 months ago
    DIY vacuum chamber for experiments

    A really nice Instructable!Will save this for future fun.

    View Instructable »
  • dick55 commented on DrewPaulDesigns's instructable Free Energy from Thin Air!6 months ago
    Free Energy from Thin Air!

    You can drive a speaker with an RF-powered crystal set:http://www.rfcafe.com/references/popular-electronics-high-power-crystal-set-august-1960-popular-electronics.htmYou can add an RF-powered amplifier:www.bentongue.com/xtalset/25AmpXS/25AmpXS.html

    View Instructable »
  • dick55 commented on Eric Brouwer's instructable Arduino UNO nRF24L01+ Shield6 months ago
    Arduino UNO nRF24L01+ Shield

    Nice Instructable and application. I'm sure your friend appreciates his "robot."It is interesting that the existing wheelchair controller had an interface that worked with servo-type commands.

    View Instructable »