Presently I just have them both powered by a usb cable, but you are correct If I use a PCB board I should use only one power source. On second thought for one of the serial connections I need the master to start before the slave which will be difficult if they are both powered together. I guess the reset button can achieve the same results.
Found this post
Looks like I will change it to 4.7 K ohm. Thanks @ScruffR
That may explain my problems with SPI. I really don’t want to switch off AUTOMATIC SYSTEM_MODE(). I have several SPI programs to test from Arduino’s and Raspberry Pi’s, sure wish someone had already got the SPI Master and Slave working on a Photon.
@avtolstoy or @mdma either of you want to add your two cents. I am trying to make some very simple: photon to photon SPI slave and master sketches. Not finding much examples so I have started my own.
I just want to send one byte from the slave to the master and one byte from the master to the slave as simply as possible. For the easiest code do you have to use onSelect and onTranserFinished as the DOCS example shows just below this link?
Now I just need some broken Photon’s that actually still have working Wifi. This is actually a bit of a problem since most of my 11 broken Photon’s don’t load Wifi . No mater how many times I tell the students not to hook a non-micro servo up to the Photon, every few weeks some creative student gives it a try.
Can’t blame all my dead Photons on the kids, I have released my fair share of magic smoke.