Know How...

Apr 3rd 2017

Know How... 299

Your Questions!

Balance your Quad, second monitor, and too much light!

Although the show is no longer in production, you can enjoy episodes from the TWiT Archives.
Category: Help & How To

We answer questions from our G+ group! How to balance a quad copter, second monitor recommendations, radio-controlled switch, and how much light is too much for your indoor grow!


Balancing Quads        
-- Mr. ROKnBOK        
"Has the subject of "balancing the quadcopter" been addressed on KnowHow? If so, please point me to that episode. Thanks, KitAs!"        
        
I need a 2nd Monitor!        
-- Daniel Casciato        
"Padre mentioned on Windows Weekly episode 471 that one of his best tech purchases was a portable accessory screen for his laptop. This allowed him to use a dual screen setup on the go. 2 questions... 1) what is this screen? 2) Can it be used with a stylus for digital notes, specifically as an input for OneNote?"        
        
Asus MB169C+    ~$150    
* 15.6"         
* Full HD        
* 1920x1080        
* IPS        
* USB-C ONLY!        
        
Asus MB169V+    ~$190    
* Same Specs        
* No IPS, USB 3.0

Throw a switch with a RC        
-- Wayne Hobbins        
"""I'm trying to figure out a way to close a connection with my RC TX using a spare channel that's not passing any electricity like 5 or 12 volts. I know how to do this with a servo and a mechanical switch, but there must be another way.

I thought that the Turnigy transmitter controlled switch might work, but apparently it needs a voltage on one wire to make the connection. I checked the red wires using a ohm meter and there was no difference when switched on and off.

Any ideas?"   
        
We're using an Arduino!        
* We're going to use the same setup that we used for the Growduino        
* The Arduino will read the PWM value from the receiver, then energizer or de-energize the relay        
        
1. Wire it:        
 - Arduino 5V to the receiver        
 - receiver signal to pin 8 of the arduino        
 - relay ground to ground        
 - relay positive to pin 7 of the arduino        
 - circuit through the relay switch pins        
2. Program it:        
 - Use (pulseIn) to read the receiver data value        
 - Use an if-else to turn on/off the relay        
        
Demo:        
1. Assemble circuit        
2. Display PWM values from Arduino        
3. Show if-else logic    

    

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