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    Here is how I accomplished input over voltage...

    Here is how I accomplished input over voltage protection. I quickly found you just cannot connect a zener across the input. A zener will have enough conduction well below the zener voltage to...
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    My Project Near Completion

    Hello,

    I am nearing completion of my project, an engine monitoring system for my light sport aircraft. I have a question that I hope someone can help with. I am using the LM2907 tach chip to...
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    Backward compatible software

    I have a FB version 3. I am using the FB to display non flight critical information in my airplane. I have spent alot of work on the input conditioning etc., so I don't want to start over. However...
  4. Another track you can use to reduce noise. Keep...

    Another track you can use to reduce noise. Keep the big wires away from the little wires. Which means keep the wires that power things like fans, ignition, etc. away from wires that are used to...
  5. To expand on Toaster, if you have a analog input...

    To expand on Toaster, if you have a analog input you treat as digital, it is easy to end up with the zero state floating. If you use a switch to toggle 5 V to the input, then consider a pull down...
  6. Thread: fuse size

    by FredWorrell
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    Here is something to consider from the aviation...

    Here is something to consider from the aviation world. First everything has a fuse or circuit breaker. Second, the fuse (or breaker) size is dependent on the wire size. The fuse is to protect the...
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    I am not seeing the fluctuations you are seeing. ...

    I am not seeing the fluctuations you are seeing. I ground any unused inputs, even for testing. I use twisted pair leads to all my sensors and a 0.1uf capacitor to decouple the input. If you have...
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    True, if you want to live with errors of up to...

    True, if you want to live with errors of up to 25% at the readings you are most concerned about. I don't care if there is errors at close to 0%. I aim for the highest accuracy overall and the...
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    I would recommend a different value for your...

    I would recommend a different value for your series resister (500 ohms) for your pressure instrument. The larger the series resister, the lower the voltage out but the more accurate you become...
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    Try again

    I need to go back to my Comodore 64 and start over.
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    Excel Spreadsheet

    Geeze you think I could get this right. Here is is again. Sorry!
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    Spreadsheet attached

    Thanks Dan. I have never gone to the "advanced" reply section. Now you have shown me how to do it... Here is the spreadsheet zipped to 6k.
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    Excel Spreadsheet for Sensors

    For those that may be interrested, I have developed an Excel spreadsheet to calculate the output of linear sensors. This is only for resistive sensors with a direct linear response. Example is a...
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    If you have a volt meter you can make some more...

    If you have a volt meter you can make some more tests. Connect the volt meter across the relay coil. That should tell you if you are getting sufficient voltage to drive the coil. If you have an...
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    I did not need transparancy with my application,...

    I did not need transparancy with my application, so using bmp files was not a problem.

    Fred
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    I too had that problem. I just saved the image...

    I too had that problem. I just saved the image as a .bmp file and it worked fine. I was never able to get the software to accept a png file no matter where I created it. All of my images are .bmp....
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    Most excellent. The tabbed windows fixed it...

    Most excellent. The tabbed windows fixed it completely! Thanks!
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    This is great. If I could get my GPS software to...

    This is great. If I could get my GPS software to work in Linux then I would absolutely scrap windows. The more applications that can be run under Linux, the less we will be held hostage by windows.
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    You're the best! I appreciate it.

    You're the best! I appreciate it.
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    Thanks, That is what I might need to do. I was...

    Thanks, That is what I might need to do. I was hoping there was a fix or that they could put a scroll bar or something.....
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    Display Button

    I have a Dell Laptop running Vista. When I try to create a new Display Button, the bottom portion of the panel is cut off (the panel is larger than my screen). Since there is no scroll function, I...
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    RonS, You may want to re-calculate. RPM and...

    RonS,

    You may want to re-calculate. RPM and frequency are not the same thing. My engine is a four cylinder and I will take my tach inputs from the coil, so I get two pulses per rpm. Also you...
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    If you don't make a thermocouple board, I was...

    If you don't make a thermocouple board, I was going to build my own (mine would not be nearly as professional as yours.....) The AD595 chip is specifically for a type K theromcouple. If you use a...
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    Excellent. So I will be replacing R2 with my...

    Excellent. So I will be replacing R2 with my resister. I want roughly 1 volt per 1000 rpm, or 1 volt per 33hz. Should be about 600K. I want to keep my supply at 5 volts to prevent accidental over...
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    Frequency to voltage

    Do you have an algorithm to size the resistors based on desired range? I will break out my tiny soldering iron.
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