Search found 134 matches
- Tue Mar 18, 2003 4:10 pm
- Forum: General Discussion
- Topic: problem in writing PID with C program
- Replies: 16
- Views: 8200
Re: problem in writing PID with C program
The Sharp GP2D12 is a distance sensor with an analog output -- cool chip, I want one! It senses distance, and outputs an analog voltage proportional to how close the object is, from 10cm. to 80cm. From the data sheet, using a +5V supply, the output voltage will be between 0.4V and Vcc-0.3V. I would ...
- Mon Mar 17, 2003 10:07 pm
- Forum: General Discussion
- Topic: problem in writing PID with C program
- Replies: 16
- Views: 8200
Re: problem in writing PID with C program
Your project hardware spec still isn't clear -- I think you're talking about using a PC with one of those multi-I/O board setups (8255 is a programmable peripheral interface, 8254 is an 8-bit timer/counter IC).<p>If you're looking for something you can just plug in to do your job, sorry -- neither o...
- Mon Mar 17, 2003 6:10 am
- Forum: General Discussion
- Topic: problem in writing PID with C program
- Replies: 16
- Views: 8200
Re: problem in writing PID with C program
Motorola PID loop routines for 68HC11 processors with PWM output
http://e-www.motorola.com/brdata/PDFDB/docs/AN1215.pdf<p>Engineering School assignment on PID loops
http://godiva.eos.uoguelph.ca/~raudette ... lerlab.pdf<p>Happy hunting.
http://e-www.motorola.com/brdata/PDFDB/docs/AN1215.pdf<p>Engineering School assignment on PID loops
http://godiva.eos.uoguelph.ca/~raudette ... lerlab.pdf<p>Happy hunting.
- Fri Mar 14, 2003 6:48 pm
- Forum: General Discussion
- Topic: Panic Switch
- Replies: 7
- Views: 3940
Re: Panic Switch
I believe you can do the whole thing from Radio Shack. Get a 4 AA battery holder which will fit in your enclosure, giving you a 6VDC supply. While you're there, get the LEDs with panel mounting hardware, some switches, a logic-level SCR, and some 220 ohm and 10 K ohm 1/4W resistors. From the red lea...
- Thu Mar 06, 2003 4:55 pm
- Forum: General Discussion
- Topic: CTR Monitor VGA switch interface?
- Replies: 9
- Views: 3897
Re: CTR Monitor VGA switch interface?
Hi. If you don't mind something of a low-tech solution, have you looked into bimetallic thermal snap switches? These automatically open and close at preset temperatures, and I'm sure there's one that will do the job for you. The fan will cycle while the monitor's on, but if you choose the thermal sw...
- Sat Feb 22, 2003 10:53 am
- Forum: General Discussion
- Topic: Stamp 2 & Relays
- Replies: 14
- Views: 6437
Re: Stamp 2 & Relays
Hi. Welcome to the "real world" of actually making all these electrons actually do something. A wonderful place it is, and one that isn't taught very well in engineering schools. Maybe the teachers are spending too much time teaching SPICE simulations. SPICE is certainly more convenient fo...
- Tue Feb 18, 2003 3:27 am
- Forum: General Discussion
- Topic: WANTED: Cheap dot-matrix LEDs
- Replies: 11
- Views: 4165
Re: WANTED: Cheap dot-matrix LEDs
Sorry - can't help you with 10 of these. There are better deals out there, but you might want to either try Jameco (surplus components that usually work), or if you're really doing the churchmouse thing, buy LEDs by the bushel and build what you want out of discrete LEDs on 10 scraps of perfboard (s...
- Mon Feb 17, 2003 11:21 am
- Forum: General Discussion
- Topic: WANTED: Cheap dot-matrix LEDs
- Replies: 11
- Views: 4165
Re: WANTED: Cheap dot-matrix LEDs
Could you provide more information? Matrix size (e.g. 5X7), color, display height, single- or multi-digit, &c. Also quantity needed. Thanks.
- Sat Feb 15, 2003 10:38 pm
- Forum: General Discussion
- Topic: POST FOR CHRIS FOLEY
- Replies: 1
- Views: 1303
Re: POST FOR CHRIS FOLEY
Hi, lex. Sorry to keep you waiting. The MBAs let my boss go, and I'm doing his job as well as my own now. I don't have an available schematic with cascading 4026s, but you might want to look at this data sheet...<p> http://www.megatronics.lk/data/4000/hcf4026.pdf <p>This has another, more legible ap...
- Wed Feb 05, 2003 9:36 pm
- Forum: General Discussion
- Topic: transistor bridge
- Replies: 13
- Views: 4763
Re: transistor bridge
Is it possible we're talking about the venerable CA3046? The part's still around (booted from RCA to several sources, now made by Intersil and refuses to die) and consists of five NPN transistors with a common substrate, two of which are connected as a differential pair. The datasheet's available at...
- Wed Feb 05, 2003 9:17 pm
- Forum: General Discussion
- Topic: cd4026 help
- Replies: 1
- Views: 1376
Re: cd4026 help
Hi, Lex. Your description of the problem may show the solution. You said you "connect the second ic clock inhibit pin to the 5 volt source". That will prevent the chip from counting. Try grounding that pin. The datasheet for that IC is available at..<p> http://focus.ti.com/docs/prod/produc...
- Mon Jan 27, 2003 8:24 pm
- Forum: General Discussion
- Topic: Talking Thermostat
- Replies: 4
- Views: 3271
Re: Talking Thermostat
Here are a couple of "store-bought" talking thermostats, Max --<p> http://home.interlog.com/~keratech/thermsd2.htm http://www.amer-comfort.com/webapp/GetPage?pid=123 <p>There are a lot of opportunities for experimentation in process heating control, but if I might express a personal opinio...
- Thu Jan 16, 2003 11:17 pm
- Forum: General Discussion
- Topic: ph sensor?
- Replies: 2
- Views: 2108
Re: ph sensor?
Information on pH sensors and meters is available at www.omega.com. Also, there is good technical reference material at the Omega Engineering site, at http://www.omega.com/techref/
- Thu Jan 16, 2003 3:52 am
- Forum: General Discussion
- Topic: car alarm
- Replies: 6
- Views: 3486
Re: car alarm
A good place to start learning about touchswitches, and digital logic in general, is CMOS Cookbook by Don Lancaster, which should be available through your library. Mr. Lancaster's web site is [url=http://www.tinaja.com,]www.tinaja.com,[/url] and is worthwhile for any technical student. You can buy ...