Author Archives: engineerzero

About engineerzero

Once and future engineer.

Controlling Multiple RGB LEDs with Smartphone via Bluetooth

Many people have done projects similar to this where they use their smartphone to control an RGB LED. My project has some twists. First, I traded color variation for intensity variation. Second, I routed the Arduino PWM signal pins through … Continue reading

Posted in Uncategorized | Tagged , , , , , | Leave a comment

Ultrasonic Toggle Switch Source Code (Arduino)

// ultrasonic toggle switch // Joe Schembrie aka ‘Engineer Zero’ // comments 6-23-2016 // the circuit for this sketch consists of a yellow and green LED and an ultrasonic distance sensor (pinger). // when a hand approaches the pinger, the yellow light comes on with the approach. // when the hand gets close enough, the value of green is toggled.   // IE, if the green LED was off, it turns on.  If it was on, it turns off. // to see this in action, visit https://engineerzero.wordpress.com/2014/06/01/ultrasonic-toggle-switch/ // The green LED toggles only once while the hand is near.  // IMPORTANT // The hand must be retracted far enough so that the yellow light goes off // for the green LED to be toggled again.  This prevents ‘bouncing.’   // NOTE:  In some respects, this device seems to work best when the yellow light is disconnected. // NOTE ON NOTE:  I wrote the above note a couple years ago AND DON’T REMEMBER WHY. // Now for inclusion of the library.   // the NewPing.h library is available on the Internet. // I did not write it.  I cannot answer questions about it. // It comes with documentation on the Internet.   // Google away! #include <NewPing.h> #define TRIGGER_PIN  11  // Arduino pin tied to trigger pin on the ultrasonic sensor. #define ECHO_PIN     10  // Arduino pin tied to echo pin on the … Continue reading

Posted in Uncategorized | 1 Comment

Orbital Hydrogen Collector

Deep space missions will require the placement of large quantities of hydrogen in low earth orbit for use as spacecraft propellant. Procuring hydrogen in low earth orbit from the surface of the earth via chemical rocket booster can be relatively … Continue reading

Posted in Uncategorized | Tagged , , | Leave a comment

Eye Robot, the Continuing Saga

My original plan for making a robot with visual pattern recognition was to connect a camera to the raspberry pi, and then the raspberry pi to my laptop, and then I would run the raspberry pi ‘headless.’ That means, I … Continue reading

Posted in Uncategorized | Tagged , | Leave a comment

Eye, Robot (Part One)

I’m toying with the idea of a robot that can interact with its environment by pattern recognition. I thought the way to do this was with a raspberry pi computer. So I bought the computer and the pi camera from … Continue reading

Posted in Uncategorized | Tagged , , , , | Leave a comment

Rocket Ship Freedom free for today (Dec 16)

Rocket Ship Freedom This is a YA novel I wrote eight years ago about a single stage to orbit rocket that travels to the Moon. It doesn’t come back, so how the crew gets home is something you’ll have to … Continue reading

Posted in Uncategorized | Leave a comment

The Wizard from Earth

My science fiction novel, The Wizard from Earth, is available on Amazon Kindle as an eBook. It’s selling for only 99 cents. If you don’t have a Kindle, you can still download the free Kindle Reader software, and read it … Continue reading

Posted in Uncategorized | Leave a comment