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Need help with a Wheelchair Mod project (I'm a beginner)

Discussion in 'General Electronics Discussion' started by grantschildcare, Dec 16, 2011.

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  1. grantschildcare

    grantschildcare

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    0
    Dec 16, 2011
    Hi there, this is my first post on this forum. I am just starting out and trying to build my first big (ish) project a wheelchair upgrade :)

    I have drawn out a circuit diagram to the best of my ability and was wondering if someone could have a look and
    a) feedback on whether it looks ok
    b) let me know what sort of POT I should use and what value of resistors I should use.
    These are the LED's I'm planning on using
    c) How I should go about Powering this as it's power supply needs to be different from the chair.

    3 Red LED's each front headlight to be run at 2.2V each
    LED 5mm high brightness - water clear lens. 476mcd min, typically 1900mcd at 20mA. 1.95Vf - 2.4Vf
    Ifmax=30mA

    3 Blue LED's each front headlight to be run at 3.1V
    5mm BLUE, 8500mcd 3.3Vf, Ifmax=25mA

    3 White LED's each front headlight to be run at 3.4V
    30000mcd 3.6Vf 50mA
    50% power angle 15deg.

    This by my calculations works out as a total voltage draw of 25.2V/Front Light therefore around 50 Volts plus the power needed for the horn and the indicators

    each indicator 4 LED's to be run at 2.2V
    water clear lens. 476mcd min, typically 1900mcd at 20mA. 1.95Vf - 2.4Vf, Ifmax=30mA

    =8.8 + 8.8= 17.6 V
    Horn to be run at 12V

    Total Draw = 80V (Would there be a loss within the circuit as well?)

    This is my attempt at the circuit diagramme. I would appreciate your help as I want to make this amazing for this kid.

    Thank you,
    Grant
    http://flic.kr/p/aWpq6T
     
  2. grantschildcare

    grantschildcare

    2
    0
    Dec 16, 2011
    Power wise I'm just thinking could I use 8 x 23A batteries fitted into a Quad AAA battery holder (working on the basis that 2x23A = same size as a AAA.

    What do you think or would I be better building some kind of series of capacitors that can be charged each night from the mains?
     
  3. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,250
    2,703
    Jan 21, 2010
    Please read this, then come back with any questions you may have.
     
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