bubble_peripheral demo app not working on brand new FRDM-K64F board

[biosbob]

when i try the run the bubble_peripheral demo on my new FRDM-K64F board, i receive the output "Sensor device initialize failed!"....  stepping through the code with the debugger, the K64 tries talking to the FX05 using four possible addresses; none of those addresses seem to respond....

i have run the SAME demo on my FRDM-KW38 board, which also has the FX05 sensor....  i have no problems on this board....

i have looked at the schematics for both boards and don't see any obvious differences -- other than the actual GPIOs used for SCL/SDA....  the address for the FX05 on the FRDM-K64F is set for 0x1D; the address for the FX05 on the FRDM-KW38 is set for 0x1F....  both programs try addresses 0x1C, 0x1D, 0x1E, and 0x1F in sequence....

here is the relevant portion of the FRDM-KW38 schematic, taken from its user's guide:

and here is the relevant portion of the FRDM-K64F schematic, taken from its user's guide:

i'm a little surprised this demo didn't "just work" out-of-the-box on the FRDM-K64F....  any suggestions what i might try next???

[biosbob]

doh!!!!!  U8 is not populated on my board....  couldn't find any notes on the product page, 

[biosbob]

duh!!!!!!   U8 is not populated on my board....  couldn't find any notes on the product page, however....

[bobpaddock · Accepted solution]

Is the FX05 sensor actually on the board?

Some boards, of various flavors, are coming with notes about some sensors not being supplied any longer.  Look at the NXP page for that board to see if there are any such notes.