Tek-Tips is the largest IT community on the Internet today!

Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!

Register Log in
  • Congratulations cowski on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

Search results for query: *

  • Users: lhatch
  • Order by date
  1. lhatch

    MUX/DEMUX Circuits

    I mentioned the Mega8, there might ne AVRs with more IO lines. You wire the data pins to your relays, or relay drivers. I would rob one of them to communicate with the chip. Lets say there are 23 I/O pins, wire 22, and one will be the RS232 input. Then write a program to monitor that pin in...
  2. lhatch

    MUX/DEMUX Circuits

    If you used the 74153 or 74154 you will still need logical to do the RS232, that is why I like the Mega8. It has all the IO lines on the chips and you use one for the RS232 communications.
  3. lhatch

    How to Control a Relay with a PC

    I have done this in two different ways. 1) a Win32 app (PowerBASIC) that talks to the serial port to a PIC 1684. Send O10 that is On 10 SECONDS, and send F1 that is oFf 1 minute. PowerBASIC was used, since I telnet into a port over the internet to flip the relay on and off. 2) Simple...
  4. lhatch

    Frequency manipulator?

    There is an article on www.bastoc.com that will count between pulses. So you square off the freq., use as AVR 2313 to count the timing between pulses, and then generate you of freq. out on another pin.. Go to bastoc.com, click RVKBASIC, and there are articles or chapters. That might help...
  5. lhatch

    MUX/DEMUX Circuits

    I would get 4 AVR Mega8 chips, 2 for input side and 2 for output (LED) side. There are, I think, 23 I/O pins. Make one TX on one pair, and other (output side) make one pin of each chip RX. Write a program to read 22 inputs, and send a bit pattern via RS232 of the input pair to the output...

Part and Inventory Search

Back
Top