2017-05-06
Finally real progress is being made. The I2C communication stuff is working on both chips. I’m taking the register-based approach and have tested the implementation of all of the basic registers. Did a bit of stress testing on the communications stuff – weird input, input overflowing buffer sizes, collisions, and etc. and everything seems to be working fairly well in a sense that there’s no corruption, the failures are predictable and graceful, all data gets Read more…
2017-04-30
It has been a while since the last update and for good reasons. So after screwing around with the DAC on the BeagleBone I decided that I really didn’t like it. What’s with this 1.8 volt max nonsense? Now I’m no EE, so please forgive the laymen’s terminology. The BeagleBone has a 12 bit ADC on-board which means that it can split the supplied 1.8V (max) into 4096 discrete steps. Which works out (if my Read more…
2017-02-17
This update has been a while in the making. Between the last update and this one I accidental adopted a dog. That little shit machine has been a time sink. The Hardware Portion So anyways, the previous objective was to interface the NASA quality 4-20mA current loop simulator with the BBB. Several related and unrelated issues had to be address A bit tangential, but the GPIO pins are high when the BBB is first turned Read more…
2016-12-31
<sometime in 2016> I decided that I needed a new thermostat for the estate. The requirements were relatively simple: programmable schedule, automatic switch over between cooling/heating based on setpoint and space temperature, humidity control, touch screen control, and last, but not least the thermostat has to be standalone. It must not have any reliance on the manufacturer’s computing infrastructure for continued operation. To make a long story short, the thermostats that fit the criteria were Read more…