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<blockquote style="position: relative; padding-left: 55px;"><section><a href="https://infosec.exchange/users/ryanc/statuses/116965422265038077">Ryan Castellucci (they/them) :nonbinary_flag: (ryanc@infosec.exchange)'s status on Thursday, 23-Jul-2026 05:05:08 JST</a><a href="https://infosec.exchange/@ryanc" title="ryanc@infosec.exchange"><img src="https://gnusocial.jp/avatar/174285-48-20231204225121.webp" width="48" height="48" alt="Ryan Castellucci (they/them) :nonbinary_flag:" style="position: absolute; left: 0; top: 0;">Ryan Castellucci (they/them) :nonbinary_flag:</a></section><article><p>I got one of my fan controllers (I need two) put together.</p><p>Its purpose is to connect to a motherboard PWM fan socket and then control up to three separate PWM fans, with I2C for configuration, control, and telemetry, along with serial for debugging.</p><p>Have not yet powered it on, anyone want to tell me what I messed up before I let the magic smoke out?</p><p>I also still need to write the code for it, lol.</p><p>The unpopulated resistor footprints at the top are I2C pull-ups, which I shouldn't need, but can add if I do.</p></article><footer><a rel="bookmark" href="https://gnusocial.jp/conversation/6569685#notice-12933776">In conversation</a><time datetime="2026-07-23T05:05:08+09:00" title="Thursday, 23-Jul-2026 05:05:08 JST">about a day ago</time> <span>from <span><a href="https://infosec.exchange/@ryanc/116965422265038077" rel="external" title="Sent from infosec.exchange via ActivityPub">infosec.exchange</a></span></span><a href="https://infosec.exchange/@ryanc/116965422265038077">permalink</a><h4>Attachments</h4><ol><li><label><a rel="external" href="https://gnusocial.jp/attachment/6279634">A top-down view of a small, rectangular green printed circuit board (PCB) resting on a light wooden surface.At the top edge are several white plastic JST-style connectors and a black four-pin header labelled "GND, 3V3, RX, TX".A large, rectangular surface-mount IC marked "AVR64DD28" takes up a lot of the board in the middle.Towards the upper right surface mount linear voltage regulator.The lower half of the board features three identical, repeating circuit layouts arranged side-by-side. Each of these three circuits contains a large surface-mount MOSFET (labelled Q11, Q21, and Q31), a diode (D11, D21, D31), a smaller transistor, and several tiny SMD resistors and capacitors. Along the bottom edge are three black four-pin PWM fan socket headers with exposed pins pointing down.</a></label><br><a href="https://media.infosec.exchange/infosec.exchange/media_attachments/files/116/965/343/789/068/016/original/c383b0a28caeca4a.jpg" rel="external">https://media.infosec.exchange/infosec.exchange/media_attachments/files/116/965/343/789/068/016/original/c383b0a28caeca4a.jpg</a></li><li><label><a rel="external" href="https://gnusocial.jp/attachment/6279635">A closer, rotated landscape view of the same green circuit board, held by a person's thumb on the left edge.This angle clearly shows the specific markings on the surface-mount components.On the right, the microcontroller chip displays the Microchip logo and the part number "AVR64DD28". To the left are the three repeating circuit blocks, where the three large MOSFET components are legible, marked "ZXMS 6006S". Surrounding them are tiny SMD components, including diodes (D11, D21, D31), smaller transistors (Q12, Q22, Q32), and various resistors (e.g., R11, R12, R21) and capacitors. The black pin connectors are visible attached along the left edge.</a></label><br><a href="https://media.infosec.exchange/infosec.exchange/media_attachments/files/116/965/344/271/109/458/original/6d4d7ce451e39200.jpg" rel="external">https://media.infosec.exchange/infosec.exchange/media_attachments/files/116/965/344/271/109/458/original/6d4d7ce451e39200.jpg</a></li><li><label><a rel="external" href="https://gnusocial.jp/attachment/6279636">A view of the flat back side of the green circuit board, resting on a wooden surface. This side is mostly flat, showing silver through-hole solder joints and a few thick copper traces visible beneath the green solder mask.In the lower-middle section, white silkscreen text reads "3x Fan Interposer v0.1" followed by the URL "https://rya.nc/".Below that, several solder pads are labelled with their functions: the bottom left features "GND, SDA, SCL" and "GND, 3V3, RX, TX"; the bottom center is labelled "PWM, TACH, 12V, GND"; and the bottom right has pads for "12V (ALT)" and "GND". The black plastic connectors protrude outward from the top edge.</a></label><br><a href="https://media.infosec.exchange/infosec.exchange/media_attachments/files/116/965/344/539/424/895/original/60fab7f334d11007.jpg" rel="external">https://media.infosec.exchange/infosec.exchange/media_attachments/files/116/965/344/539/424/895/original/60fab7f334d11007.jpg</a></li></ol></footer></blockquote>

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Ryan Castellucci (they/them) :nonbinary_flag: (ryanc@infosec.exchange)'s status on Thursday, 23-Jul-2026 05:05:08 JST Ryan Castellucci (they/them) :nonbinary_flag:
I got one of my fan controllers (I need two) put together.
Its purpose is to connect to a motherboard PWM fan socket and then control up to three separate PWM fans, with I2C for configuration, control, and telemetry, along with serial for debugging.
Have not yet powered it on, anyone want to tell me what I messed up before I let the magic smoke out?
I also still need to write the code for it, lol.
The unpopulated resistor footprints at the top are I2C pull-ups, which I shouldn't need, but can add if I do.
In conversationabout a day ago from infosec.exchangepermalink
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