Project Idea: Dual Lynx To Vex Handshaking Modules

Sorry it took so long, but here is some info on how to make the Dual Handshake Module Jim & I designed two years ago. All files are attached in a zip file at the link below. These files include:
  • All inventor part files: tweak to your heart’s content
  • STL and Makerbot files
  • DXF files for the cover.
  • Various pictures to help with assembly
  • Materials list
  • PDF of this Project
reddownloadHandshake Module Container



Parts List v2
Items above in red are not needed. These were from version 1. This brings the cost down, but requires you to use less costly servo extension wires for the cables.

Soldering Diagram (Better one coming soon!)

solder diagram 2



  1. Solder 4N25 IC’s in place. Use caution and work quickly as they are heat sensitive.
  2. Solder LED’s and Headers in place (or wires, your choice!)
  3. Knock the corners of the board off so it fits into the container.
  4. Snap the board into the container.
  5. Place the spacers on top of the board.
  6. Place the cover on carefully.
  7. Put the 4-40 screws through.
  8. Put the nuts on the back, tighten carefully.

Tips and Tricks:

Paint the cover BLACK before you peel it, and the black dots will indicate where the black wires go!  The arrows indicate the direction of the communication: Tail of the arrow = the signal “Sender”, head of the arrow = signal “Receiver”  Cover
 Container back  Container front
Container back prints with space for 4-40 nuts. Container front prints so that the board will snap into the built in standoffs. IN ORDER TO FIT, YOU HAVE TO KNOCK THE CORNERS OFF THE BREADBOARD. I used a belt sander.  
To assemble the parts, see below. Be sure to use the printed spacers to stop the board from wiggling around!  
 HSM exploded view
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How do I Handshake A VEX Cortex With a Lynxmotion Arm?

IF YOU CANNOT READ THE DIAGRAMS BELOW,PLEASE CLICK ON THE DOWNLOAD BUTTON TO GET A PDF VERSION! reddownloadLynx-VEX Handshaking Notes Question: How do I receive a signal on a Cortex from the SSC-32 (Lynx Robot) in RobotC? Answer: One way to do it is shown in the example below. A machine is waiting for a signal from the robot. The €œwhile€ statement in the program below is not necessary, just an added bonus as a start switch. NOTE THE COMMENTS BELOW FOR HOW THE WIRING GOES! LynxToVEXwiring LynxVexHS3 Question: How do I send a signal from the Cortex to the SSC-32 in RobotC?  Answer: It is definitely best to set a SensorValue to either 1 or 0 and make it a Digital Output!  Any other way and the signal will be backwards. Notice that you can check the value of the signal in the debugger window.  Notice that there is only one =. This sets the value. == means compare….. VEXtoLynxWiringSerial LynxVexHS2 Question: How do I make it talk back and forth? Answer: See the picture below. Please read the comments too! LynxVexHS1 Continue Reading



This post is ARCHIVED, meaning the links may or may not work!
My computers do not have serial ports, what is the best way to connect them to my computer?


Best solution for now is below, but nothing beats the good old serial port. Check  the back of the computer and see if it has one. If it does, use it!  It is 100x’s better than any converter with FlowArm.

After many years of using these, we have come to this conclusion: Some of them work better than others with certain things. The one below works best with the Lynx Arms and Flowbotics Studio.

IN MOST CASES YOU MUST INSTALL THE DRIVER THAT COMES WITH THE DEVICE (OR CAN BE DOWNLOADED FROM THEIR WEBSITE) IN SOME CASES THE WINDOWS DEFAULT DRIVER DOES NOT WORK WELL. Repeat: Install the proper driver! If you have one of the devices below, click on the links to get the right driver.

The ones we have found to be most stable when using Lynxmotion Robots with Flowbotic Studio are made by FTDI, and are bought atDigi-KeyThey’re about $19 at Digi-Key, and work with Windows 7 in my lab without installing drivers.  If you need drivers, they are here. I have not personalyy tested these with anything but this ftdi
iogear The ones we have been recommending for years, that worked with Fischertechnik, Basic Stamps, Lynx arms with RIOS, pretty much everything in the PLTW curriculum is the one made by IOGear. We found them for $21 atCyberGuys. You MUST install the drivers for these, and they come with it, or you can go here to get them. When used in this application without the driver installed, it does not wo
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Jim Hanson

Chris Hurd


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