View Full Version : Strange Lights on Quick Start Board

04-05-2012, 01:23 AM
I recently ordered and received a Quick Start (QS) board. I noticed that the built in LED's may light uncommanded if I touched the terminals on the back of the board. To be safe I put a strip of electrical tape on the back to protect the exposed circuit contacts. Strangely, the LED's still light if I run my finger across the electrical tape protecting the terminal holes. Is this typical? What is the cause?

David Carrier
04-05-2012, 01:38 AM
The LEDs on the QuickStart are like logic probes on the I/O pins, they reflect the state of the I/O pin, but the I/O pin itself is not directly driving the LED. Because of this, the LEDs may blink on and off randomly when the I/O lines are not driven. For information about the LEDs on the QuickStart, go to http://www.parallaxsemiconductor.com/products/quickstart, click on the "Specifications" tab half way down the page, then scroll down to where it says "LEDs".

— David Carrier
Parallax Inc.

Duane Degn
04-05-2012, 01:50 AM

I've tried to list some of the QuickStart projects I've done and that fellow forum members have done here (http://forums.parallax.com/showthread.php?132216-Modified-QuickStart-Demos-and-QuickStart-Projects.).

The QuickStart servo tester (http://forums.parallax.com/showthread.php?137197-QuickStart-Servo-Tester)is one of my favorites right now. Oh, and you've got to check out a QuickStart board controlling 32 servos (http://forums.parallax.com/showthread.php?137597-QuickStart-Driving-32-Servos-(Video)).

04-07-2012, 12:30 PM
Good stuff there Duane. Thanks David, and my aplologies for not RTFM'ing (Reading The Full Manual)!