powering multiple I2C for arduino due

Other Hardware Motors, Mechanics, Power and CNC
1

Hi all,
Sorry but I am a complete noob to using the Due board and have always used 5V boards. I am building a usb midi device that uses a lot of arrays, so the due was the way to go. I want to power an Adafruit trellis, an Adafruit 16x8 led matrix and an I2C 128x64 oled screen.
In this example Adafruit Learning System
the LEDs are powered with batteries to as it says (keep the arduino happy)I wish to use a regulated 5v power supply.
I have purchased an Adafruit 4-channel I2C Bi-directional Logic Level Converter – BSS138 to step the currents from 3.3v to 5v (for the I2C peripherals). What I am wondering is where on the example on the Adafruit website page the power supply and the 5v pin are both connected to the LEDs, would I use the same set up but with the 3.3v pin with the logic converter in between?
hope this makes sense

thanks in advance

Lee

2

No, it doesn't make sense.

Power the 5V sensors from the 5V pin on the DUE. Don't try to share the high-current power that the LEDs are using. One side of the level converter will connect to 5V, the other to 3.3V.

3

Hey Morgan,
Thanks. So I should just attach the power supply to the LEDs and power the trellis and OLED from the board and all the data transfer via the level converter? Once my board arrives (hopefully this week) I'll try it and post the results for future queries.

Lee