Reef Angel Forum

The 10k resistors are I2C pull-up resistors. 10k is shown on the datasheet for the I2C level shifter that the RA uses, but it's probably too high. Search for TI's "Application Report SLVA689: I2C Bus Pullup Resistor Calculation." (I can't post links.) Lower values give a stronger signal, a...

Here are a few observations that may be helpful to anyone trying to interface with the Relay Expansion over I2C without using the main RA controller: You can control the Relay Expansion over I2C using the protocol you'll find in Relay.cpp, but there are a few caveats that aren't documented in the so...

Yes, it's new since 1.6.6. I can't post links; there's a discussion at questions/6504211/ on stackoverflow. I don't know quite how it works, but I suspect it's also one of the reasons it takes so long to compile RA on Arduino. I should make a post about using PlatformIO (thanks for merging!); it's g...

Yes, I agree that the webwizard is a more mainstream option; I guess the better suggestion would be to delete the 1.x download (which doesn't work) and instead link to the webwizard, with maybe also a link to this thread or forum with a comment about how to use the Arduino IDE. :) Incidentally, the ...

I can confirm that the 1.8.6 release also works on Windows, once a few files missing from the Dropbox release are copied from something else. (They're also missing from the Github page.) I had to copy boards.txt and hardware\arduino\avr\variants\RAPlus\pins_arduino.h from the MacOS release. (Which c...