Project Suggestions, Bugs and Changes

There were bound to be problems!!

• Rather than 4 AA batteries giving 6V, the circuit seems to work better with a single PP3 9V battery. The cost is about the same.
• If the circuit is working , then the red LED should vary in intensity as you press the electrodes. That is it also mirrors the resistance so that you can see what is happening. If the LED stays red or stays off, and it cannot be altered with the variable potentiometer then there is something wrong.....
• Double/triple check the pcb for proper connections to all of the chips. A dry solder joint, where there is not a proper connection, will cause the circuit to fail.
• Check that the resistances are in the right places (DO THIS BEFORE SOLDERING!)
• A test meter will be available during the lab classes.
• The project hits the buffers with trying to find a means to read the Joystick from C! You will also find that you cannot substitute an INP(Port_Address) too easily for STICK(0)! The solution? Well, you could try a trawl of the Internet....
  We will publish the URL about the Joystick, (discovered by Emily Mangan and Damian Richardson) when a few other pairs have tried the to solve the problem.
  Any other suggestions? e-mail John Maher, it might be worth a bottle of wine.