Articles in the Electronics category

  1. Testing the HA-B04 in-wall switch PCB

    I have built a prototype of the 6-way switch circuit board (photos below), and done an initial, very basic test: I can communicate with the microcontroller when I power the thing with 12V through its bus connector, and can use the on-board 16MHz crystal oscillator module (as opposed to the ...

  2. First in-wall switch board revision is a FAIL

    The six-button switch for in-wall mounting that I wrote about in March (no update for quite some time!) has been designed, the board layed out and manufactured.

    Today I wanted to populate the first board to have it handy while implementing the device firmware, however, I noticed that the main ...

  3. Planning an in-wall switch assembly

    I have started to work on a switch assembly to be mounted in standard in-wall mounting boxes, so that the finished thing will blend in with my other light switches and wall outlets, but have a bit more control capabilities.

    The switch buttons will be white (as are my other ...

  4. Fresh boards

    As noted in the last logbook entry, there are some new CAN I/O module boards which I have started populating. Hot-air soldering worked well for the output controller module's SMT parts, and the dispenser needle was actually still usable after two days in a sealed plastic bag. However ...

  5. Fume extractor for the E-Lab

    Finally I found the time to build a solder fume extractor for the "production" place in the lab:

    Fume extractor in window opening over work table

    The window insert is made out of plywood and lined with pipe insulation to give a tight fit against the walls around it. Mounted to it are two handles for easy insertion ...

  6. End-to-end test successful

    Today I have debugged the problems constructing CAN datagrams described in a previous post.
    I found some flaws in my handling of the various parameters handed to the CAN message object constructor. As soon as I had fixed these, the end-to-end testing was successful!

    I press a switch, and the ...

  7. Testing the full setup

    Today I have tested prototypes of the whole automation infrastructure together: The control PC running the complete software stack, a switch input board with a "real" light switch, and an output controller with a "real" relay attached:

    HA test setup with switch and output relay

    The control PC and USB/Dual-CAN interface are stacked on the left side ...

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