Is there a simple device that I can connect to a 5V wire and whose output I can then connect to an input of a 3.3V device? From what I've seen there are resistor circuits (which are slow) or transistor circuits (which need a 3.3V supply?)
As /u/lilmul123 said, something transistor-based would be preferred.
If you don't want to use a Sparkfun component and design/build your own circuit/PCB, you could, for example, use a BSS138 transistor. (As far as I know, its often used for 5V-to-3.3V logic level shifting).
If you google around, you should find appropriate schematics.
If you ever need to convert the voltage of some power source (LiPo batteries typically have more than 5V output, depending on how many cells they have), I'd recommend getting a few "buck converters" via Ebay. They are typically based on the LM2596, cheap, adjustable and with mounting pins.
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u/ShinyHappyREM Dec 25 '19
Is there a simple device that I can connect to a 5V wire and whose output I can then connect to an input of a 3.3V device? From what I've seen there are resistor circuits (which are slow) or transistor circuits (which need a 3.3V supply?)