Eric, Beth, Rex, Amy, Christine, and I paddled together through the Lava Falls Rapids on the Colorado River in Grand Canyon. Our guide, Tom, led us through flawlessly. Many thanks go to Outdoors Unlimited for the spectacular week-long experience! On this day (July 2, 2015) the river was flowing at about 17,000 cfs.
The rapid went smoothly for our boat (the first paddle boat of our group to go through), but after those quick thirty seconds passed, we spent the following two and a half minutes positioning ourselves for swimmers who washed out of their boats behind us.
Everyone from our four paddle rafts and four supply boats eventually made it to Tequila Beach for our overnight camp. Marco arrived nursing a sore knee from an impact in the raft.
The Deep Astronomy channel on YouTube presents some cool stuff from space, including this one looking back over 13 billion years ago. The Hubble Space Telescope zooms in on an apparently-barren patch of space and then software gives us a virtual “fly-through.”
Documentation from Numato says that in order to turn on an individual relay on their URMC16 USB Relay Module, users should send the command, relay on x. This command, they say, Turns a particular relay on. The parameter “x“ stands for the relay number. The relay number starts from zero. See some examples below.
relay on 0 – Turns on relay 0
relay on 1 – Turns on relay 1
That is all good for relays 0 through 9, but what about relays 10 through 15? Trying, for example, to turn on relay 12 with relay on 12 led to relay 1, if it was off, being turned on. So the controller seems to be getting the first digit and ignoring everything after that.
The next thought was that relays 10 through 15 would be addressed by their hex names, ‘a’ through ‘f’, allowing them each to be referenced by a single character. But relay on c had no effect on any relays on the board.
After some frustrating searches, I finally found what appeared to be an older version of their documentation. In the older version, they give examples of commands sent to switch the higher-addressed relays, and relay on C was what I needed. The address character needs to be in UPPERCASE. I sure wish they would have included that in the documentation.