Periscope LEDs and RoboteQ

Not a whole lot going on. I did find a very cool surplus electronics store this week in Santa Clara called HSC. They carry a LOT of stuff at a fraction of the cost and the place is full of things that can be used on R2. I was hoping to find a slip ring to experiment with but I was out of luck. I did pick up a few bits though, including some red rectangular LEDs for the front slot on the periscope.

I did a quick test fitting on my aluminum periscope housing and they fit perfectly.

There’s very little published reference material for the periscope, but I have it on good authority that the front red light was made up of 6 of these LEDs.

I also worked a bit on my RoboteQ speed controller, adding a RS232 connection to the provided PWM cable to allow me to monitor things live from a tethered laptop. Basically I ran two wires (RxD/GND) from the 25-pin plug they provide to a 9-pin RS232 plug/housing.

The plug you see on the right may look like an RS232 connector, but it’s really used to connect just two PWM wires from the Vex receiver into the RoboteQ. It comes as standard with the controller, and they also provide a seperate RS232 cable to connect your computer. I really don’t understand why they don’t just provide one combine cable. Confused? Please see the RoboteQ manuals 🙂

Once the controller is connect to my computer I can use they’re monitoring software called roborun. It polls the speed controller and graphs live data like battery voltage, controller temperature, current being used, PWM data etc. It also allows me to exercise the motors without using my RC transmitter.

Posted by Chris on January 10th, 2008 in Electronics | 2 Comments

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