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  1. crutschow

    Has anyone ever replaced a garage door opener that uses the old fashioned dip switch decoder with a raspberry pi? I need to use the old remotes.

    How many buttons does the wall control have inside the building? Does it have a separate stop button?
  2. crutschow

    Has anyone ever replaced a garage door opener that uses the old fashioned dip switch decoder with a raspberry pi? I need to use the old remotes.

    That makes no sense to me. All the dip switches I've seen are binary with just two positions, giving a logic high or logic low output.
  3. crutschow

    how to limit surge current?

    Is there no connection diagram on the soft starter?
  4. crutschow

    clock movement battery

    True for high current loads, but here you are only outputting microamps, so the power loss would be insignificant (which equals the regulator voltage drop times the current), and no heatsink would be required. But perhaps it needs a tiny load comparable to the multimeter, which is why I...
  5. crutschow

    clock movement battery

    Yes, that is strange. Try connecting the converter to the battery with a 1 megohm resistor across the battery It may be the converter needs a small load to properly regulate. Don't understand why you used a buck regulator here as, at that low output current its quiescent current likely makes...
  6. crutschow

    Why Does My iPhone Overheat and How Can I Resolve It?

    Under what conditions does it overheat? Did you try closing all the apps you aren't using?
  7. crutschow

    Has anyone ever replaced a garage door opener that uses the old fashioned dip switch decoder with a raspberry pi? I need to use the old remotes.

    The MC145028P has only one output so how does it discriminate between up, down, and stop?
  8. crutschow

    Hi everyone My name is GODWIN and have been working on a simple light intensity control system using the attached circuit but both my res burns

    Post the schematic. A wiring diagram is too difficult to follow.
  9. crutschow

    clock movement battery

    Then I think my suggestion of using a 1.5V alkaline while applying 1.5V to it through a 1kΩ resistor should keep it going indefinitely.
  10. crutschow

    Has anyone ever replaced a garage door opener that uses the old fashioned dip switch decoder with a raspberry pi? I need to use the old remotes.

    It would seem to be not too difficult to generate a program to perform the functions of the MC145028P flow chart in post #2. Have you done any programming before? If not, you may have to find someone who has, or take the time to learn the basics of programming. The Basic language is one of the...
  11. crutschow

    Has anyone ever replaced a garage door opener that uses the old fashioned dip switch decoder with a raspberry pi? I need to use the old remotes.

    Isn't that normally intrinsic to the door opener circuitry, as it just takes a pulse to start up or down, and automatically stops at end of movement? That's all the manual push-button on the wall does to control the door (at least for all the residential openers I've used). So the output signal...
  12. crutschow

    Has anyone ever replaced a garage door opener that uses the old fashioned dip switch decoder with a raspberry pi? I need to use the old remotes.

    Not a trivial task. If you look at the MC145028P data sheet you will see a flow chart that shows it's operation (below). You would write a program for the Pi to emulate that flow charge sequence. You also need an RF receiver that converts the received RF signal to the digital pulses for input...
  13. crutschow

    Split Power Supply using xformer w/o CT

    You could use two inverse connected diodes for half-wave rectification from one side of the winding, giving a plus and minus voltage, with the other side of the winding being common.
  14. crutschow

    Automatic chicken door

    One of these should work for you.
  15. crutschow

    Circuit selector

    Opps, caught again by a necroposter.:eek:
  16. crutschow

    clock movement battery

    Probably will need one in series with the supply output since the supply may otherwise sink current when it's not powered if the battery is directly connected to its output. Then adjust the supply to give no more that 1.5V at its diode output when connected to the clock and battery. Applying...
  17. crutschow

    Circuit selector

    One way to switch the resistors with low error is to use power MOSFETs, which can have an on-resistance of 0.5mΩ (example) with no intrinsic offset voltage. That would give a error of 0.05% in series with a 1 ohm resistor.
  18. crutschow

    clock movement battery

    Seems like a lot of work just to avoid having the replace the clock battery every year or so. You could extend the battery life by going to an alkaline C or D cell. A D cell has about 5 times the capacity of an AA so should last at least 5 years before needing replacement.
  19. crutschow

    want to use Headphones and main speaker

    You will need to use an ohmmeter to determine which pins are connected together when there is no plug into the jack, and all the pin connection to the plug outputs when the plug is in the jack.
  20. crutschow

    want to use Headphones and main speaker

    The pins from the jack should go through the board. Need to see the pins on that (other) side of the board.
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