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rbrainard
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Posts posted by rbrainard
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Good news, I got it to work over the weekend. What I didn't notice is that the hall effect switch pulls down and not up as I had belived. So, I replaced the push button with the hall effect switch and changes the 2N2222 NPN transistor to a Radio Shack 3906 PNP and it worked. Hurray!! Thanks for your help Suraj.
Ryan -
CORRECTION:
In my second comment I put "100mA." What I meant was 100mV.
Thanks for the reply. I will try the LED test when I get home. As for the output voltage of the sensor, should I worry about the output voltage? -
Ok, looking close at the specs of the hall effect switch, it has an average output voltage of 100mA. I suppose that is not enough to power the ic. Does anyone have any idea what type of amplifier I should use and any times on how it would be installed? Again, any help would be greatly appreciated. I am new to the circuit world and I need all the help I can muster.
Thanks in advance,
Ryan -
Hello all. I had a quick question.
I have a 4510 counter I made that uses a button and Schmitt trigger to count. What I am hoping to do is replace the button and trigger with a OH090U HALL EFFECT switch (has an internal schmitt trigger) but can't seem to get it to work. The counter works with the push button but when I install the hall effect switch it won't count. Is there something I am missing? How much current is required to make the counter acknowledge "high"?(The hall effect switch put out about 10-12mA when I tested it) Any help is greatly appreciated.
I got the idea fro this project from this site:
http://members.shaw.ca/roma/up-down.html
Thanks in advance,
Ryan -
Thanks for the ideas MP. I thought about the mercury switch idea and have been leaning towards using some type of Hall effect switch. I think that would fit my application a bit better anyhow. I will also contact him. Who better to ask right? Thanks again. See you in the forums.
Ryan -
Perhaps you are right. I should just try the project and make sure I learn the process before I jump in head first. Again, thanks for your help.
Ryan -
First off, thank you for the quick reply. You have been most helpful.
Secondly, it seems like the HC74xx series would be a better choice. Is there any counters or decoders in that family? My idea is to use a Lith-Ion coin battery (3v 1000mAh). So, it would seem more stable if I were able to use a chip that could handle the lower voltage? Any ideas on alternative chips?
Thanks again. I really appreciate your help. This is a field that seems to have high barriers of entry sometimes.
Ryan -
Ok, to start I would like to mention that I am VERY new to building circuits. Now that that is out of the way, I have some questions for anyone interested.
I am planning on building the step counter project http://www.electronics-lab.com/projects/misc/007/
My first question is how can you estimate how long the battery for this project will last? Is there a formula or is my best bet to turn it on and see?
My second question has a little less to do directly with the project. I have noticed a lot of the ICs that everyone used specify using 5/10/15V. Now, suppose I want to make a project operate on battery power. How does one find a battery that is compact and can supply 5V? I want my projects to be small but I can't think of any battery combinations that add up to 5V. Is there a small power inverter I can create?
Any help would be greatly appreciated. Thanks in advance.
Ryan
Correct hall effect switch usage
in Electronic Projects Design/Ideas
Posted
Thanks AudioGuru, looks like we posted about a minute apart. The terminology is all new to me. When I read the data sheet, I didn't know what "Pull-Down" meant exactlly until I hooked up some LEDs and figured out that the hall effect switch simply allows the circut to ground out. Slowly, I learn what the heck I am doing. Thanks for the help and patience.