I built a weather station a couple of years ago using the fascinating electronics anenometer. I used a single BX-24 to read the weather sensors, including the...
the bx24 works fine with a h21a2 and the 330k/330 Ohm resistor set up.... i was having difficuty with this at first due to bad pins on the bx24... never...
Hi Carol I've used about 300 BX24s and never had a bad pin in a new device yet. What probably happened is you had a pin turned on as an output and connected...
Carol, what is your application (sorry if I missed it earlier)? One thing about the sensor you are using is ambient lighting. Even though many simple sensors...
cfrancois, I designed a weather station based on an older PIC 40-pin processor around 12 years ago. I was using recycled Heathkit wind sensors. I checked...
the H21A2 is inside a box so there is no ambient light trouble.... there is no modulated carrier however and i am not at all certain why it should need one......
Carol, this is good stuff!!! I'm partial to Quarter Horses and Morgans. Appys for the long ride. Gawd, I could really take this off- topic but "AutoJump" is...
... You two are talking about different notions, I think. Tom, she is using an optical interrupter, not an optical distance sensor; an interrupter can operate...
... http://www.maxim-ic.com/products/ibutton/weather/ Tom Tom Becker --... ...-- GTBecker@... www.RighTime.com The RighTime Clock Company, Inc., Cape...
Carol, as far as modulation, it helps with ambient light. Also, you can implement codes that are very robust. This is why all the remotes for TV, etc, use...
Tom, I've designed interrupter sensors in saw mills that had full sunlight in certain situations. We really needed the modulation. On another 'paw', my current...
... sunlight... If I needed to shoot six feet outdoors I might modulate, too, Tom. Have you encountered an environment that required optical modulation to ...
Tom, I have a better understanding of Carol's environment and, like the shaft encoders, a simple reflective sensor would be fine as you mentioned. I had...
I am setting up a BX-24 on a breadboard. I am powering pin 21 with the breadboard's built-in +5V supply. I have the PC Com port on pins 1-3, a Scott Edwards...
Jim You almost certainly have a power supply problem, or an earth missing. About the only way to kill a BX24 is over voltage, or pulling more than the rated...
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David Sousa Mendes
davidsousamendes@...
May 5, 2005 10:59 am
Hello My BX24 was also damaged yesterday. Every time I try to download the program, I get the following error message: Error verifying external EEPROM Data...
... No, it's built-in. From page 19 of the Atmel AT90S8535 dox: "Reset Sources: The AT90S4434/8535 has three sources of reset: . Power-On Reset. The MCU is...
I forgot to mention, I use the same reset line to reset a PIC LCD driver chip from Peter Anderson and the DS1232 has both RESET and /RESET outputs so you can...
actually, i would like to explore the possibility of measuring distance accurately in full sunlight.... how could one most cost effectively do that to a...
... the ground? Ultrasonic rangefinders will work well there, I suspect. You have a number of choices; check Robot Electronics, Acroname, etc. Links are in ...
... You'll note that the schematic for the earlier BX-24 shows a regulator chip that resets the AT90S8535 when the regulator drops out. The mega8535 has...
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Steve Thatcher
melamy@...
May 5, 2005 4:05 pm
define your view of accurate... in other words, 1%, an inch, a foot, etc. best regards, Steve Thatcher ... From: Carol <carolkysela@...> Sent: May 5,...
... regulator drops out. You're right. The LP2951 will produce its ERR status (and thus a system reset) earlier, at 4.75v. Tom Tom Becker --... ...-- ...
I'd like to get about +/- 1/16" at a distance of 7'. 1/8" at 5' would be about the least that could be utilized using it to measure the height of a box above...
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Steve Thatcher
melamy@...
May 5, 2005 5:00 pm
you are talking about 0.15% accuracy, so you can eliminate cheap ultrasonics. The best industrial ultrasonics using Polaroid sensors are in the 1-2% range....
