CloudACM – Page 47 – Autonomous Computational Machines

Cacti and Custom Data Source Monitoring Part 1 of 2

March 6, 2017 Patrick Gilfeather

Introduction and Background I had posted about Cacti and setting up graphing from unorthodox data sources before. When I stepped back through those documented steps, I didn’t get the expected results. The inaccurate and vague information on that post prompted me to take a hard top to bottom look at the process. For anyone that had viewed that post and become confused by it, I do apologize. I dedicate this post to you as a humble attempt to right my…

Control and Distribution of Power – ATX and Pi

February 27, 2017 Patrick Gilfeather

The sensors and devices that I plan to control are located several meters from each other. This is just the nature of things. If I want to successfully deploy and reliably use the system, it means I’ll have to reconsider how everything is powered. The bench in my lab allows me to use AC adapters to power the devices. The wall outlet is nearby and I don’t have to fuss so I can focus on other things. This isn’t true…

I2C – Squaring up multi device communications

February 20, 2017 Patrick Gilfeather

UART and SPI communication have benefits and limitations. UART is confined to point to point links, whereas SPI requires additional slave select channels from the master. Both do not scale well for multiple devices. For that reason, I2C was developed with the introduction of device addressing in the data channel. I2C stands for Inter-integrated Circuit and it uses a clock channel to synchronize its data channel. Only two wires are required to achieve this. They are defined as SDA for…