Geekworm Raspberry Pi X735 V3.0 DC 6V-30V Width Voltage Input Power Management with Safe Shutdown & PMW Cooling Fan Expansion Board Compatible with Raspberry Pi 5/4B/3B+/3B

I wanted a way to power the Pi that runs the SKR board or my Ender 3. The buck converters that everyone uses to power Pis never made sense to me, since they start sagging voltage when the Pi pulls power (I saw it drop below 4V at full load). This board accepts the 24v from Ender's PSU, and is said to be able to handle RPi4, so a much less power-hungry Pi 1 should run no problem. And it does - no more undervoltage warnings. And no more plugging the RPi PSU separately from printer. The extra fan is nice - keeps my printer enclosure well ventilated. The fan script works as well. I did have to install a jumper so that it powers the Pi on when it receives power, and I just cut its power when I'm done - no soft off, no issues so far. The only complaint is the faint ~20kHz switching noise it makes; it's not very loud but changes with varying load, so a bit annoying. When the printer is printing inside an enclosure, I can't really hear it. But I'll try to dab some sticky onto the inductor to calm it down, just for peace of mind. Not bad at all!

This is far and away the most well thought out aftermarket add-on for a Raspberry Pi that I've seen or purchased. I use my RPi 3b+, with Build-a-Pi, for amateur radio work, including EmComm and outdoor event support. Amateur radio lives off 11-14 volts DC, using either car battery power or solar through Anderson PowerPole connectors and cigarette lighter adaptors, for mobile or UPS application. This provides 6-30 vdc conversion to the general RPi 5 volts AND with more than enough current for a 3B+ to run with wifi and all USB ports full and no more "under-voltage". In addition, it includes a silent fan, bus extender and breaks out different voltages with their own 2 pin jacks, giving more expansion capability after it's installed, not less. ... AND an on-board power switch! Granted I've only had it for a few days, so too soon to have reliability data, but since it exudes care and quality, I'm feeling confident about it. (I've put tape over the USB 3 & C inputs so that I don't fry the circuitry by connecting 5 and 12 volt power at the same time, but it's good to know I can power my Pi off my phone charger or laptop USB if I'm away from my car or my other mobile power.)

This is a lot to spend if you just want a variable speed fan. I installed this on a new RPi4 with the X825 SSD board. It's quite a sandwich of boards with the power supply feeding the X825 and the X825 jumpered to the X735. The X735 supplies power to the RPi and offers momentary and toggle switching connectors, plus two 5-volt sockets. In addition, a power button is included, so you have to decide which power button you want to use. (The X825 is the master control of the 5-volt source.) NOTE: After adding the X825-C3 case, I moved the power input to the X735 and powered the X825 board from the X735 output.As with the other boards in this series, documentation is sparse and you can expect more to come form the community. For me, this was more a fun thing to try and a way to be relatively certain my RPi4 wasn't too hot..

Powers my pi 4b off my ender 3 v2.

I used this power management/fan module in conjunction with Geekworm's hard disk controller and a new Raspberry Pi 4B. Initially, there was an issue with the included hardware (standoffs were too long, preventing contact with the Pi's expansion header). I notified Geekworm and they quickly agreed to send me a replacement hardware kit consisting of 150 standoffs and screws for half price. The new kit got here in 2 days (thanks to Amazon - fairly remarkable at Christmas time with the whole country needing stuff NOW!). All of the Geekworm parts seem very sturdy and fit together beautifully. I expect this fan unit will keep my Pi cool for many years to come.

Easy to install, good instructions

Not for beginners I wanted this to work. I'm not experienced enough with pi to get the drivers to work. If you know what you are doing it would be a great product.

[See Updated Info Below]In the interests of those new to the Raspberry Pi world, looking to invest time and effort into this case and companion expansions, there are several missing clarifications, especially for those attempting to build a Pi NAS, using the Geekworm X825-C8 metal case (and/or the companion expansions X825 v2.0 SATA HD board & X735 V2.5 Cooling Fan). More specifically, the installation & functionality of the X735v2.5 cooling fan. Here’goes.** The Short **1 – Using Raspberry Pi 4B, requires the Raspberry Pi OS “Lite”2 – Be sure to do Pi OS/System updates and then install X735 required scripts3 – OpenMediaVault & Plex installs/updates don’t disable X735** The Long **Assembly instructions and preliminary power checks are fair, the support video’s are mostly helpful. The confusion begins with the lack of information specific to setting up the RPi NAS. This ensemble requires the Raspberry Pi “Lite” OS (my testing worked with both the legacy and standard 32bit versions). I assembled everything (including the hard drive attached on the X825 sata expansion board), flashed the RPi Lite OS image to MicroSD, and inserted into the Pi. Updated passwords as necessary and conduct the system updates. It was at this point that I was able to install the required scripts necessary for the X735 fan to work.Once I confirmed power off & on testing, I then went ahead with installing OpenMediaVault (OMV). To my amazement, the installation of OMV didn’t overwrite anything which disabled the X735 fan! I conducted the standard setup for getting my media copied on the attached hard drive and got Plex Media Server up and running.I look forward to using this rig when I travel; however I have several connectivity tests pending before I can put my full confidence in the rig performing to expectation. TBC[Update to the X735 Saga]I changed my rating from 3 stars to 2 stars. After using this fan in my Pi NAS, I've noted that "ANY" update applied disables the fan from working. Why? The short, geekworm is putting out substandard programming. Avoiding a full blow tirade, I've had to rebuild my Pi NAS 3 times because the fan fails once an update is applied. In the end, when you do the initial setup as I've described in my original post, you're pretty much stuck with that install. Updating the Raspi OS, OMV, or Plex will make the X735v2.5 fail. The only reason I'm giving 2 stars, is because when the X735 works, it works well...if you can keep it working...