Trouble initializing RFM69HW

[wolfland]

I too got excited about the Uber Home Automation Instructable, but having trouble even getting the RFM69HW to initialize. ( I know this by printing out the return Boolean from radio.initialize in the code)



I am using two 433MHz RFM69HW (which I thought were 915Mz when purchased), and one Arduino UNO from Adafruit, and a uno clone called DCcduino uno.



My main question is do you need to put resisters on the SPI pins to get the signals down to 3.3 volts? Could too high SPI voltages damage the board?



Also, I haven't done anything to "switch the UNO to 3.3 volts" like mentioned ( not sure how to). The power into RFM69 is off the 3.3 volts on the UNO .


Are there any other debugging options? Perhaps in the .cpp code?


Thanks for any help

[kmac]

The RFM69HW modules can only handle 3.3V signals. You will have to use a voltage divider or logic level converter on the signal lines.

[papa]

        wolfland, you might try this that computourist posted:

... If you are handy with a soldering iron I would recommend changing your UNO's to 3.3 Volts, as described here.

This thread has a lot about using level shifters.  I use Buono Uno Arduino compatibles that can be switched between 3.3 & 5 volts.  computourist uses 3.3 volt Arduino Pro Minis