T&L Publications

perfectbite,<p>The kindest thing you could do for her would be to install a simple digital thermostat. You could drop in on her from time to time to adjust the settings.

Ron, <p>I believe you. <p>Thank you for your quick response.

I am building a pushbutton input 4 bit serial-in parallel-out shift register. I can use Four D flip-flops with synchronous clock pulse using a 0.3 hz clock(50% duty cycle 555 timer w/ LED on output already built).<p>Holding the push button down as the timer blinks from on to off (negative edge trigg...

Mike,<p>I built a very simple serial port I/O interface between a thermistor and 486 PC. I wrote the program in BASIC. A couple of resistors, a transistor, and a thermistor was all it took. Total cost was about $5.<p>Let me know if you are interseted.

Stephen,<p>The Fairchild MM74C923 data sheet has everything I need to know. After I build the encoder I will post the results.<p>thank you.<p>"Why?...because its there"

Stephen,<p>The three or 4 counter IC's sound like a great way to go, I'd really rather avoid having to program a microcontroller.Do you know where I might find a schematic design for this?

poseidonx,<p>Maybe the only way to use this keypad is with a microcontroller. Thank you for the link to the notes for using the PIC 16C54 for the interface. I will try using the PIC 16F84 for the interface( I built a programmer for the PIC 16F84 several years ago).

While getting some stuff I needed online from All Electronics i also bought a 12 Button Matrix Encoded Keypad (about $5). A very simple keypad.<p>The problem is that it has 12 buttons but only 7 pins (7 pin header). I now know that the keypad is designed for a microcontroller (for example the EDE114...

dacflyer,<p>When you get it all figured out and built please let me know how you did it. I have been programming 16 pin microcontollers for years and didn't know there were 8 pin mcus easily and cheaply available. <p>I use a programmer I built myself and MPLAB(free) for my assembler howver 16 pin mc...

Jolly Roger,<p>That is a nice FSM design project. What is the frequency range? I may build this.<p>
Why? "because it's there"

petemig,<p>Are you still interested in RS-232 I/O relay control articles by Ray Green?

fro66y,<p>I built an I/O system that plugs into the DB-9 serial port. It controls up to 3 mechanical relays. The code (written in QBASIC) and design I got from an article by Ray Green in N&V.<p>It works great. The total cost was about $5.<p>If youre interested let me know and I will hunt thru my...

HP,<p>That is a nice schematic. How did you get it on your post?<p>I think you must have put the drawing on a website and then posted it as a URL with a UBB code? <p>Ive tried to paste in schematics directly but have never been able to do it.

Sorry to interupt, but what does the ".net" mean? I searched VB.net and it appears to be simply the next version of VB after VB6. But then I believe I stumbled on alot of other ".net" suffixes on other programs.<p>I am guessing that ".net" means that they have revised t...

Will,<p>It is the $17.95 kit (see link below). Have fun, it's a great kit!!<p>Microcontroller Kit