I'm making a stand-alone arduino circuit powered by a 9v battery with a normal 7805 volt regulator bringing the power down to 5v.
Part of my circuit uses an adafruit colour sensor, this is one of the sensors that Must be powered from the 3.3v source rather than the 5v.
Were I just using a normal arduino in the circuit I would just power the colour sensor from the 3.3v pin but as I've got a stand alone circuit using an atmega 328 chip I don't think the chip actually regulates the supply down to 3.3v, it appears that that is the arduinos doing.
What is the recommended way to bring the voltage down to what I need (3.3v)? I was thinking I might just use a simple voltage divider circuit but I have heard people saying this is not a good idea due to the circuit being dependant on current flow so are there any other recommended simple ways of doing this.
Thanks in advance