New to Electronics

Discussion in 'The Projects Forum' started by NickIrons, Nov 26, 2013.

  1. NickIrons

    Thread Starter New Member

    Nov 26, 2013
    I restore motorcycles from the 1980's for people in my age
    range (40-50) and I have now been asked modernise a bike
    to have a gear selection indicator using a two digit 8 segment
    display. I have a good knowledge of vehicle electrics, but very
    limited knowledge of electronics. I have bought a display and
    have managed to get various segments to light up by giving
    pin 1 a positive charge and then earthing a pin that corresponds
    with the left segment digit and the same with positive to pin 2.
    My problem is, with the wiring diagram supplied with the display,
    with pins 1+2 with a positive charge any segment I light up on the
    left, also lights up on the right. Any help would be greatly
    appreciated. Many thanks, Nick.

  2. t06afre

    AAC Fanatic!

    May 11, 2009
    Perhaps it would be better to use two stand alone displays. And the mount them together. Should be the same size any way. Why use two displays ;) Also you need to use a resistor on each segment to limit the current. As each segment is plain and simple LED
  3. #12


    Nov 30, 2010
    You have 3 choices: 1) you bought the wrong chip. 2) You are expected to quickly switch pins one and 2 with the proper segments grounded so it LOOKS like they are both on with the correct display, and 3) This site does not do vehicle modifications. Try electrotechonline.
  4. NickIrons

    Thread Starter New Member

    Nov 26, 2013
    Hi thanks for the replies,
    I'm not looking for vehicle modifications, I merley stated what I
    do. I have six different earths and I need to make a circuit that
    reflects that in an eight segment display. I get the impression
    that with the display I have, I need more than just a positive and
    negatives to do what I require. So am I looking at using processors/chips
    etc..?? ? You'll have to excuse my terminology as my electronics
    knowledge is very limited.
    Many thanks..
  5. Meixner


    Sep 26, 2011
    Hi Nick, How many gears do you need to display? Do you need 2 digits? You could use whats called a diode matrix to select the patterns you need.
  6. Experimentonomen


    Feb 16, 2011
    Aint this technically a violation of the ToS section "Automotive Modifications?":confused:
  7. NickIrons

    Thread Starter New Member

    Nov 26, 2013
    It seems I'm in breach of your ToS, all I wanted was help in making a circuit which is not possible so I'll bother you no more. There are other forums on the net where I may find my answer.
    Many thanks.
  8. Georacer


    Nov 25, 2009
    Yes, what you ask for is a modification of the current "entity" that is a bike; an extension of its current capabilities. Thus it is against the Terms of Service.

    Best of luck on the rest of the internet.