I'm new to electronics and unsure whether my design below will work as intended. XBee Series 2 and Arduino Pro Mini 5V are used. There are 4 LEDs, each with the following roles:

  1. LED1: Flicker when transferring data to XBee
  2. LED2: Flicker when transferring data to Arduino
  3. LED3: Turns on when XBee is powered on
  4. LED4: Turns on when Arduino is powered on

enter image description here

Also, will it suffice to use 3.3V LEDs for LED1, LED2, LED3 and 5V LEDs for LED4?

  • They will all fail to work. Consider fooling around with LEDs separate from a MCU first. Feb 27 '15 at 20:32
  • 1
    Note that the LEDs on the UART might not work how you desire them to, and that I have no idea what DIO9 does. Feb 27 '15 at 21:05
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    @Gerben I notice that there are no 5V surface mount LEDs (0603 or similar) on Digikey/Mouser, am I checking under the wrong categories?
    – Nyxynyx
    Feb 27 '15 at 21:08
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    @IgnacioVazquez-Abrams Looks like I should connect LED3 to pin 1 instead... I was hoping the UART LEDs will flicker like on the Arduino Uno
    – Nyxynyx
    Feb 27 '15 at 21:10
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    There's no such thing as a "5V LED". You take the Vf of the LED you have, and then you calculate the resistance required to drop the rest of the voltage with the desired current. Feb 27 '15 at 21:11

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