Project Suggestions, Bugs and Changes
Updated
28th April 1998 @ 16.37
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.