Level shifter

arduino uno BSS138 logic level shift 5V 3.3V bidirectional

Level shifting up

Converting up from 3.3V to 5V.

Level shifting up schematic

Level shifting up Multimeter result

Level shifting down

Converting down from 5V to 3.3V.

Level shifting down schematic

Level shifting down Multimeter result

References

  1. Bi-Directional Logic Level Converter Hookup Guide
  2. Instructables 4 Channel Logic Converter 3.3V - 5.0V Tutorial
  3. Level Shifting 3.3V microcontrollers and NeoPixels