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RPi + Other Software Capacitor and resistor with APA102s

Discussion in 'Hardware Support' started by Biggles, 23 April 2017.

  1. Biggles

    Biggles Member

    Messages:
    59
    Hardware:
    RPi1/Zero
    Hi, setting up Pi zero w with a 5m strip of APA102s and adding a level shifter as the chip was only 49p so it seemed rude not to. On several diagrams using ws2812b strips it shows a capacitor and resistor added, as these are only pennies again, should i be adding them to my set up to be on the safe side?

    Thanks.
     
  2. penfold42

    penfold42 Active Member

    Messages:
    746
    Hardware:
    RPi1/Zero, RPi2, RPi3, 32/64bit, +Arduino, +nodeMCU/ESP8266
    What's the level shifter ?

    Where are the cap and resistor ?
     
  3. Biggles

    Biggles Member

    Messages:
    59
    Hardware:
    RPi1/Zero
    Level shifter is a 74HCT125N, capacitor and resistor are as per guides on here.
     
    Last edited: 2 May 2017
  4. penfold42

    penfold42 Active Member

    Messages:
    746
    Hardware:
    RPi1/Zero, RPi2, RPi3, 32/64bit, +Arduino, +nodeMCU/ESP8266
    I don't know what page you're referring to so I'll make some guesses...

    I'd recommend a capacitor between power and ground to keep the chip happy.

    A series resistor on the output is really only helpful if you have a very long wire between the Pi and the 1st led but fitting it probably won't hurt
     
  5. Biggles

    Biggles Member

    Messages:
    59
    Hardware:
    RPi1/Zero
  6. Biggles

    Biggles Member

    Messages:
    59
    Hardware:
    RPi1/Zero
    How does this look...

    [​IMG]