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  1. chopnhack

    GPS NMEA, Failover Circuit upgrade attempt.

    8 to 15 - Check 13 to 15 - Check How are you getting 38k ohm reading between your receive in pins? Are they not isolated from Vcc?? Assuming that your incoming RS232 feeds are not part of this circuit how are they coupled? And for both channels to have this is highly suspect... Your next...
  2. chopnhack

    GPS NMEA, Failover Circuit upgrade attempt.

    That is very interesting. Curious for a large company to have a critical batch failure like that though... I wonder if it would not be more likely a counterfeit batch that got out? Constantine, did you repeat the tests the last post on the stack exchange mentioned to check for resistance on the...
  3. chopnhack

    Designing a Time Delayed Relay

    No, just U3. U2 sits at 2.5vdc.
  4. chopnhack

    GPS NMEA, Failover Circuit upgrade attempt.

    Well spotted Chris! This is a good reason for why Kris and Hevans frequently stated to draw schematics with a top rail for Vcc and bottom for common, makes it easier to catch errors like that one. ;)
  5. chopnhack

    GPS NMEA, Failover Circuit upgrade attempt.

    Hi K, according to the Texas Instrument data sheet, it just needs a 5V supply : Operates From a Single 5-V Power Supply With 1.0-µF Charge-Pump Capacitors. I will go back to your schematic, but its important that you have all your caps in place. Edit: Caps on chip look good to me. What about...
  6. chopnhack

    Designing a Time Delayed Relay

    Ok, back at the bench with the circuit hooked up - the relay is clicking on within three seconds of the circuit being energized with no load on the Allegro's. I reviewed the program and did not see anything that would lead me to believe there is a programming issue, especially since this was...
  7. chopnhack

    Designing a Time Delayed Relay

    Yes sir, I really liked your idea at first, but when I thought it through I didn't think the wires would present much of an effect on the allegro's - there are so many wires the chances of the lines of force actually lining up in a meaningful way to induce a current seemed unlikely.... but you...
  8. chopnhack

    Designing a Time Delayed Relay

    LOL, yeah, I was semi confident when I threw the breakers, but you never know ;) Possibly, but it didn't resurface after the programming changes and after much testing so I assumed that it was gone. Negatory - I tested with each removal of a wiring harness and finally again with all harnesses...
  9. chopnhack

    Designing a Time Delayed Relay

    I had a chance to install the boxes today, but after I finished wiring and turned the power back on, I hear the relay click on, about 2-3 seconds after powering on the circuit via the rocker switch at the top with no load! :confused::mad: At first I thought I wired the 220v portion incorrectly...
  10. chopnhack

    weatherproof, low-current mini LEDs on long leads?

    Hi Rob, welcome to the forum! You have written out a pretty detailed description of what you're after. To my knowledge, a general LED is waterproof - the lens/housing is typically epoxy. Corrosion of the leads would be your main worry. As for long leads, I would think about using whatever length...
  11. chopnhack

    Designing a Time Delayed Relay

    Got the coating done this morning, I can recommend the product based on its ease of application and quick dry time despite the high humidity! Hop, those wire ferrules, bootlace ferrules, whatever they're called, are the bee's knees :D Apparently they have been in use worldwide, but not...
  12. chopnhack

    Designing a Time Delayed Relay

    Indeed! I am still baffled and not sure if it was interpretation of code, code not cycling adequately, my misunderstanding of how ASRESH, ADRESL were handled, the list goes on and I have researched some, but still coming up empty handed. I will throw it out on the Microchip forum to see if...
  13. chopnhack

    Designing a Time Delayed Relay

    Some photos of the intended enclosure: a 2 gang 4" square deep box, modified to accept the 'power on' LED as well as a power switch for the control board. The box has some offsets to raise the board off of the back, its a pretty tight fit, but the height was needed because of the box's ground...
  14. chopnhack

    Another find at the Habitat for Humanity Restore

    Wow... look at the size of those lugs! What were they asking for on this one Bob?
  15. chopnhack

    Designing a Time Delayed Relay

    Some more data from today's trials - I wanted to test AN2's (U3 Allegro) linearity with respect to various current levels. Here is what I found: Amperage.........Expected Binary Value............Tested Binary Value........Variance From Expected Value...
  16. chopnhack

    Designing a Time Delayed Relay

    I was unable to enter any form of code prior to main (such is the construct of C programming - even embedded ASM has to be called from within main, as best as I understood/tested). I did add a delay at the beginning of main of 1 second. I am still not sure as its hard to reproduce GP5 going...
  17. chopnhack

    Designing a Time Delayed Relay

    Good grief... this defines many things in life, LOL. Good one, Hop. That is what I have been doing, courtesy of the wife's 1875 Ionic pink hair dryer, and yes - she consented ;). I checked it before I started programming to determine that on low it draws about 4A. Of course after repeated tests...
  18. chopnhack

    Designing a Time Delayed Relay

    Sure, gotta wait for eldest to finish cad'ing his latest 3D creation, lol. Going to need another desktop soon! I'm not sure what you mean by metastable, but I did check the power on routine to see what the GPIO ports are set at. They are all x's, so unknown... Made me think though, if it...
  19. chopnhack

    Designing a Time Delayed Relay

    I looked really carefully and couldn't find any traces that where crossed, no tin whiskers, etc. Just some rosin left over. I hit it with the brush and blew out a few times and tried it again. So far after about 45 minutes of intermittent testing, it is working as it should. Vout from the U2...
  20. chopnhack

    Designing a Time Delayed Relay

    Be fair now, this was a large undertaking :D:rolleyes: LOL I didn't have trouble soldering those at all, but the pins 1-4 internally are linked via a large piece of copper, so its possible there could have been accumulated heat damage. I did drag solder the sucker... I am glad you jest :D I am...
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