Newbie needs help !

Discussion in 'The Projects Forum' started by Bob Wilmott, Jan 1, 2015.

  1. Bob Wilmott

    Thread Starter Member

    Jan 1, 2015
    39
    0
    Hi All,

    I've attached (if I pressed the right buttons) front and back views of the transmitter part of a cheap wireless doorbell.

    The problem I have is that when I press the doorbell button, it makes the ding-dong sound, but only once. What I want is for the transmitter to transmit, and the receiver to ding-dong, continuously (until switched off).

    I've tried everything that my layman's brain can think of... holding the doorbell button down, putting a paper clip between numerous combinations of the soldered bits on the back of the PCB, etc. Nothing I've done makes the ding-dong go continuously :-(

    I'm guessing that the microswitch is a type that sends just a single pulse rather than a continuous one.

    Does anyone know how I can achieve the desired effect ?

    Thanks,

    Bob
     
  2. iimagine

    Active Member

    Dec 20, 2010
    129
    9
    what would happen if you are not home and the paperboy rang the bell? :D
     
  3. nerdegutta

    Moderator

    Dec 15, 2009
    2,517
    785
    Hi, and welcome to the forum.

    A better picture of the PCB backside would be nice. If you have a scanner, you can try to scan it. :)
     
  4. ebeowulf17

    Active Member

    Aug 12, 2014
    678
    79
    Seems like you'd want the reset on the bell side, not the transmitter side, right? If so, you'd want the transmitter to work as it currently does, sending a signal just once, and you'd want the repetitive loop on the receiving end. That would also be much friendlier in terms of battery consumption.
     
    absf and #12 like this.
  5. #12

    Expert

    Nov 30, 2010
    16,343
    6,825
    The doorbells I installed last year will not "ding" until you let go of the button, so...what ebeowulf said.
    Do it on the ringer end.
     
  6. Bob Wilmott

    Thread Starter Member

    Jan 1, 2015
    39
    0
    No problem, I wouldn't hear it :)
     
  7. Bob Wilmott

    Thread Starter Member

    Jan 1, 2015
    39
    0
    Backside attached. Not as big as Kim Kardashian's but hope it's good enough :)
     
    Last edited by a moderator: Jan 1, 2015
  8. LDC3

    Active Member

    Apr 27, 2013
    920
    160
    Yes, you would. When you got home and find out that you need to replace the battery.
     
  9. Bob Wilmott

    Thread Starter Member

    Jan 1, 2015
    39
    0
    OK, sounds hopeful. Can you explain what I'd have to do on the ringer side? Will it help if I send scans of the ringer front and back ?
     
  10. Bob Wilmott

    Thread Starter Member

    Jan 1, 2015
    39
    0
    Planning to run it off a 12v DC transformer.
     
  11. bertus

    Administrator

    Apr 5, 2008
    15,648
    2,348
    Hello,

    I have resized and cropped your images.
    Please keep the image sizes smaller as you did.

    Bertus
     
  12. Bob Wilmott

    Thread Starter Member

    Jan 1, 2015
    39
    0
    Thank you, Bertus, I didn't know how to do that ! ! !
     
  13. bertus

    Administrator

    Apr 5, 2008
    15,648
    2,348
    Hello,

    What system do you use?
    For windows and linux there is the gimp available.
    http://www.gimp.org/
    With that you can resize, crop, adjust brightness and contrast and more.

    Bertus

    PS I am using ColourPaint on my linux machine for the resize and crop.
     
  14. Bob Wilmott

    Thread Starter Member

    Jan 1, 2015
    39
    0
    I have Windows XP. I'll try the gimp. Is it what people call a "snipping tool" ?
     
  15. Bob Wilmott

    Thread Starter Member

    Jan 1, 2015
    39
    0
    OK, here are scans of the front and back of the receiver/ringer side.
    How do I add a repetitive loop, please ?
    Thanks,
    Bob
     
  16. bertus

    Administrator

    Apr 5, 2008
    15,648
    2,348
    Hello,

    Are you using a flatbed scanner for the pictures?
    Can you position the PCB back in the corner of the scanner and set the resolution a step higher?

    Here I used even 1200 DPI on a PCB:

    [​IMG]

    Now you can read the values of the resistors.

    Bertus
     
  17. Bob Wilmott

    Thread Starter Member

    Jan 1, 2015
    39
    0
    I'm sorry, I think this is the best scan I can do.
     
  18. bertus

    Administrator

    Apr 5, 2008
    15,648
    2,348
    Hello,

    On wich resolution did you make the scan?
    Is the PCB close to the glassplate?

    The printer/scanner I own has a selectable scan resolution of 75,100,150,200,300,600 and 1200 DPI.

    Bertus
     
  19. Bob Wilmott

    Thread Starter Member

    Jan 1, 2015
    39
    0
    I think it was on 200.
    I have tried it on 2400 and 1200 but the PCB comes out as a black splodge !
    I will try 300 and 600.​
     
  20. Bob Wilmott

    Thread Starter Member

    Jan 1, 2015
    39
    0
    300 and 600 attached. No better :-(
     
Loading...