I have 10 of these kits. They are Brand New, never opened in the original boxes. They are the add-on Transmitter and receiver for the Vex robotics kits. From product:
Adds funtionality to your Vex robot by adding new possibilities. Will not interfere with the channel of your Vex Starter Kit. Allows you to have two human operators control different functions of the same robot.
What’s in the box
Transmitter Unit
Transmitter Frequency Module -channel 89
RF receiver module
Receiver crystal - channel 89
Receiver antenna sleeve
Receiver antenna sleeve holder
Keps nuts
Installation screws
Inventor’s Guide
9" RJ-10 cable to interconnect between RF receiver and Vex Micro Controller
As a person experienced from trading/buying parts from evo I dffinately can say he is honest to his word and is a pleasure dealing with. You will deffinately get your money’s worth with him.
The Vex line was recently bought by Revell, who are going to be using a redesigned controller for their version of the set. A lot of the original Vex controllers - nice 6-channel sets, and quite usable - hit the surplus market a while back because of it. There were some nice lot buys available on ebay, where people were selling multi-unit lots of them.
I’m guessing that Evo got his hands on one of said lots, and is passing on the “extras” to us.
Edit: Either that, or he’s changed his mind about building the 60-DOF killer hexapod in his garage…
LOL. I sold my soul to the devil for 10 Vex controller sets.
I was unaware that they have been on ebay. I just had a guy I know locally find a source for them at less than cost and I bought 10 thinking I could make a couple bucks and give a few people some transmitters for alot less than new.
I might have been wrong. LOL I’m open to offers if anyone wants one. I have no use for them. I just thought eventually I would get rid of them.
SpaceJunk, I’m knee deep in wheat man. Middle of the prairies in Saskatchewan.
One thing that you need to keep in mind about the VEX receiver is that it is a serial output and you need a way to decode the individual servo postions in the serial PPM (Pulse Position Modulation).
The thread at Parallax was started by me and does not mention the Servo article. The decoding methods shown in the thread can be done by software or hardware.
The VEX article in Servo mag is informative, but you have to have a paticular MCU to implement the solution presented in the article.
Evolution,
I bought the three VEX combos that I have on eBay for between $10-$20 each plus shipping. I plan to use the joysticks in them for a custom wireless robot controller.
I seem to recall that there was a recent article regarding decoding the VEX controller’s output in SERVO magazine as well, but I may be wrong on that. For all I know, that Parallax link may mention it as well - I didn’t see it in my quick skim of the postings, though.
Ahh man. I just checked ebay and there are about 20 buy it nows for $15 to $20. I had no idea. I just checked a few robot stores and they were selling them for $99 to $129. And I paid $35 a piece for these. It was spur of the moment and it seemed like a good idea. lol. Guess not.
Now I have to find some kind of use for these. I use a 72 mhz Futaba 9CHP and a JR 9303 with my planes and heli and a 75mhz Futaba 9CAP for surface bots. So I really have no use for these.
I have built a circuit that converts the serial pules train back to pwm for standard servos. It supplies power for the rx and connections for 6 servos with an off the shelf IC (4017).
You really do not have to use a hardware circuit to decode the serial output of the VEX receiver. It was an option, but the software version works quite well and does not require the use of six of the processor I/O pins and can be fine tuned on the fly.
