Fork me on GitHub

Project Notes

#134 BidirectionalLevelShifterModule

Test a bi-directional 5/3.3V level shifter module.

The Modules


3.3/5V level-shifting modules are quite common, as the need to interface 5V microcontrollers with 3.3V devices/sensors (or vice versa) is pretty common. Often these are billed for I²C or SPI, although they are non-specific and can be used for level-shifting any kind of digital signal. Note: yes, digital high/low signals only; they do not provide an analog scaling of voltages.

I got some of these modules from a seller on aliexpress

This circuit is a quick test of their behaviour: a switch in the 5V circuit controlling a load (LED + resistor) in the 3.3V circuit.

This is identical to the test circuit used in the BidirectionalLevelShifter project, which demonstrates the basic FET trick used by these modules.

All good! Now to put them to work…



The Schematic

The Build

Credits and References

About LEAP#134 FET
Project Source on GitHub Project Gallery Return to the LEAP Catalog

This page is a web-friendly rendering of my project notes shared in the LEAP GitHub repository.

LEAP is my personal collection of electronics projects, usually involving an Arduino or other microprocessor in one way or another. Some are full-blown projects, while many are trivial breadboard experiments, intended to learn and explore something interesting (IMHO!).

The projects are usually inspired by things found wild on the net, or ideas from the sources such as:

Feel free to borrow liberally, and if you spot any issues do let me know. See the individual projects for credits where due. There are even now a few projects contributed by others - send your own over in a pull request if you would also like to add to this collection.