HC-06 Bluetooth Module General Help
When I look at the one I have, I can see a 3.3VDC regulator on the carrier board (the board the bluetooth device is placed on). And it also looks like there are some level shifting resistors on board. At any rate it works OK with 5VDC in my setup.
Also in Chapter 5 of the documentation, it shows the regulator in the schematic.
One thing I did discover - I can connect to the H6 with my iMac, but not an iPhone. According to the Arduino forum on the H6, it is not compatible with an iPhone (but it is with Android). A slightly different bluetooth version "HM-10" supposedly is compatible with the iPhone. Perhaps Tayda could stock those at some point?
For those who come along following the date of this post. From my research, into the line levels of this module, it appears the correct information would be "+5V" pin is 5 volt tolerant, due to a 3.3V onboard regulator. This regulator does not effect the "3.3V" requirement for the "RX" pin, for safe operation. You will get away with 5 volts, for a while, but this will eventually burn out the pin/port. Use a voltage divider on the "RX" pin if your input level to the "RX" pin is more than the "3.3V" required for the chip-set. Which IS the case with the diagram presented by Tayda in the description of this device. They are feeding 5 volts directly to the RX pin. BAD BAD BAD!!!