dar8808@cec1.wustl.edu (David A. Rochberg) (03/28/90)
My chemistry teacher would like to build a digital geiger counter, and I have agreed to help him. We hope to build a device that will change the output of the geiger tube into a TTL-compatible signal (This shouldn't be too hard, but help would be appreciated) and then measure the time between pulses with a 32.7 Khz clock (easy to build). The part we need help with is sending the resulting two bytes of data to the science department's Apple IIe. Can anyone tell me how to do this or give me references. This is for a public high school, so there is a shortage of money, but we are willing to spend a good deal of time on the project. Please e-mail responses, as I don't normally read this group. Thanks in advance, David Rochberg david@david.wustl.edu uunet!wuarchive!wubios!rock
qig@mentor.cc.purdue.edu (The Insane Hermit) (03/28/90)
Ok I can see a few ideas I might have for you. The easiest way to get things into the apple is through the joystic port. You can use the standard one on the back of the case or else use the socket on the mother board though I have no idea how to access that one. Some good things about using the joyport are you can read it easily from apple's basic bot prodos and splesoft versions. If you need an A/D converter it is already built for you. If you don't need the A/D converters then just use the pins for the joystick button. These can be read by peekign the proper location in memory. The A/D converters can be accessed through pdl() from apple soft if you use the main connector on the back. If you wish more information mail me back with more details of what you plan to do on the computer end. I know nothing of geiger counters and such stuff but bit's and bytes I can help you with possibly. The Insane Hermit The Zip-Man qig@mentor.cc.purdue.edu Chris Eleveld p.s. I would have mailed this but it bounced. I hope this is helpful. And as I said if you need more details mail me.