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connecting a 7-segement led to BS — Parallax Forums

connecting a 7-segement led to BS

ArchiverArchiver Posts: 46,084
edited 2000-12-20 19:03 in General Discussion
You might try connecting the display to a 7447 driver, using only 3 basic
stamp lines to drive it. Check out
http://www.hcc.hawaii.edu/~richardi/113/c113_2f/2f_2/2f2.htm for more
general display info. You should be able to leave the DP unconnected if you
don't need a decimal point. Using the driver, you simply input a the binary
equivalent of the decimal number you wish to display.
Original Message
From: <ohnaf@y...>
To: <basicstamps@egroups.com>
Sent: Monday, December 18, 2000 3:28 PM
Subject: [noparse][[/noparse]basicstamps] connecting a 7-segement led to BS


> Hi every one,
>
> I want to display keypad presses on a 7-segment (one digit) led.
> I don't want to use any additional chips and I want to connect
> the
> led directly to the basic stamp
>
> I already wrote the keypad-scanning program on the basic stamp 2 and
> it's working properly.
>
> I don't know what to do with the led though!
> The pins on the led are as follows:
>
> Pinout:
> Pin 1: ................ Anode F
> Pin 2: ................ Anode G
> Pin 3: ................ N/C
> Pin 4: ................ Common Cathode
> Pin 5: ................ N/C
> Pin 6: ................ Anode E
> Pin 7: ................ Anode D
> Pin 8: ................ Anode C
> Pin 9: ................ RHDP (Right Hand Decimal Point)
> Pin 10: ............... N/C
> Pin 11: ............... N/C
> Pin 12: ............... Common Cathode
> Pin 13: ............... Anode B
> Pin 14: ............... Anode A
>
> NOTE: Pins 4 & 12 are internally connected
>
> All anodes will be connected to the I/O pins of the BS through
> resistors
> Common cathode will be connected to ground
>
> What about the RHDP pin? Should it be grounded or left floating?
>
> And I'm not sure how to send data to the anodes using pbasic.
> If anyone has a program or can help, I would appreciate it.
>
>
>
>
>

Comments

  • ArchiverArchiver Posts: 46,084
    edited 2000-12-19 17:43
    Hi all

    Thanks for your reply David, but I don't want to use a driver.
    So is it possible to connect the led directly to the BS?





    --- In basicstamps@egroups.com, "David Peterson" <robodave1@h...>
    wrote:
    > You might try connecting the display to a 7447 driver, using only 3
    basic
    > stamp lines to drive it. Check out
    > http://www.hcc.hawaii.edu/~richardi/113/c113_2f/2f_2/2f2.htm for
    more
    > general display info. You should be able to leave the DP
    unconnected if you
    > don't need a decimal point. Using the driver, you simply input a
    the binary
    > equivalent of the decimal number you wish to display.
    >
    >
    Original Message
    > From: <ohnaf@y...>
    > To: <basicstamps@egroups.com>
    > Sent: Monday, December 18, 2000 3:28 PM
    > Subject: [noparse][[/noparse]basicstamps] connecting a 7-segement led to BS
    >
    >
    > > Hi every one,
    > >
    > > I want to display keypad presses on a 7-segment (one digit) led.
    > > I don't want to use any additional chips and I want to connect
    > > the
    > > led directly to the basic stamp
    > >
    > > I already wrote the keypad-scanning program on the basic stamp 2
    and
    > > it's working properly.
    > >
    > > I don't know what to do with the led though!
    > > The pins on the led are as follows:
    > >
    > > Pinout:
    > > Pin 1: ................ Anode F
    > > Pin 2: ................ Anode G
    > > Pin 3: ................ N/C
    > > Pin 4: ................ Common Cathode
    > > Pin 5: ................ N/C
    > > Pin 6: ................ Anode E
    > > Pin 7: ................ Anode D
    > > Pin 8: ................ Anode C
    > > Pin 9: ................ RHDP (Right Hand Decimal Point)
    > > Pin 10: ............... N/C
    > > Pin 11: ............... N/C
    > > Pin 12: ............... Common Cathode
    > > Pin 13: ............... Anode B
    > > Pin 14: ............... Anode A
    > >
    > > NOTE: Pins 4 & 12 are internally connected
    > >
    > > All anodes will be connected to the I/O pins of the BS through
    > > resistors
    > > Common cathode will be connected to ground
    > >
    > > What about the RHDP pin? Should it be grounded or left floating?
    > >
    > > And I'm not sure how to send data to the anodes using pbasic.
    > > If anyone has a program or can help, I would appreciate it.
    > >
    > >
    > >
    > >
    > >
  • ArchiverArchiver Posts: 46,084
    edited 2000-12-19 17:53
    At 05:43 PM Tuesday 12/19/2000 +0000, you wrote:
    >Hi all
    >
    >Thanks for your reply David, but I don't want to use a driver.
    >So is it possible to connect the led directly to the BS?
    >
    >More than anything, that will depend on the current it draws, and
    >the voltage it requires. Which display chip is it ?
    >
    >Bruce Bates
  • ArchiverArchiver Posts: 46,084
    edited 2000-12-20 19:03
    Hi!

    The led that I'm using is from Radioshack and these are some of its
    specifications:

    Type: ...... S321R

    Maximum Volts (forward): ..... 2 V

    Reverse Voltage : ...... 5 V

    Maximum Amperage (forward): ..... 20 mA

    Wavelength: ......660 nM

    Brightness: ...... 125 micro candlepower

    Material: ....... GaAsP

    Power Dissipation: ...... 100 mW










    --- In basicstamps@egroups.com, Bruce Bates <bvbates@u...> wrote:
    > At 05:43 PM Tuesday 12/19/2000 +0000, you wrote:
    > >Hi all
    > >
    > >Thanks for your reply David, but I don't want to use a driver.
    > >So is it possible to connect the led directly to the BS?
    > >
    > >More than anything, that will depend on the current it draws, and
    > >the voltage it requires. Which display chip is it ?
    > >
    > >Bruce Bates
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